diff --git a/app/code/Magento/AdvancedPricingImportExport/Model/Import/AdvancedPricing.php b/app/code/Magento/AdvancedPricingImportExport/Model/Import/AdvancedPricing.php
index 667bc8d9b883c..8e6af26c45150 100644
--- a/app/code/Magento/AdvancedPricingImportExport/Model/Import/AdvancedPricing.php
+++ b/app/code/Magento/AdvancedPricingImportExport/Model/Import/AdvancedPricing.php
@@ -380,7 +380,7 @@ protected function saveAndReplaceAdvancedPrices()
                         ),
                         'qty' => $rowData[self::COL_TIER_PRICE_QTY],
                         'value' => $rowData[self::COL_TIER_PRICE],
-                        'website_id' => $this->getWebsiteId($rowData[self::COL_TIER_PRICE_WEBSITE])
+                        'website_id' => $this->getWebSiteId($rowData[self::COL_TIER_PRICE_WEBSITE])
                     ];
                 }
             }
diff --git a/app/code/Magento/Backend/Block/System/Store/Edit/AbstractForm.php b/app/code/Magento/Backend/Block/System/Store/Edit/AbstractForm.php
index f19799d2e4939..034887c67d1ee 100644
--- a/app/code/Magento/Backend/Block/System/Store/Edit/AbstractForm.php
+++ b/app/code/Magento/Backend/Block/System/Store/Edit/AbstractForm.php
@@ -37,7 +37,7 @@ protected function _prepareForm()
             ['data' => ['id' => 'edit_form', 'action' => $this->getData('action'), 'method' => 'post']]
         );
 
-        $this->_prepareStoreFieldSet($form);
+        $this->_prepareStoreFieldset($form);
 
         $form->addField(
             'store_type',
diff --git a/app/code/Magento/Backend/Controller/Adminhtml/System/Account/Save.php b/app/code/Magento/Backend/Controller/Adminhtml/System/Account/Save.php
index ac73d3629083a..01fa9c7c8257f 100644
--- a/app/code/Magento/Backend/Controller/Adminhtml/System/Account/Save.php
+++ b/app/code/Magento/Backend/Controller/Adminhtml/System/Account/Save.php
@@ -50,9 +50,9 @@ public function execute()
         $user = $this->_objectManager->create('Magento\User\Model\User')->load($userId);
 
         $user->setId($userId)
-            ->setUsername($this->getRequest()->getParam('username', false))
-            ->setFirstname($this->getRequest()->getParam('firstname', false))
-            ->setLastname($this->getRequest()->getParam('lastname', false))
+            ->setUserName($this->getRequest()->getParam('username', false))
+            ->setFirstName($this->getRequest()->getParam('firstname', false))
+            ->setLastName($this->getRequest()->getParam('lastname', false))
             ->setEmail(strtolower($this->getRequest()->getParam('email', false)));
 
         if ($this->_objectManager->get('Magento\Framework\Validator\Locale')->isValid($interfaceLocale)) {
diff --git a/app/code/Magento/Backend/view/adminhtml/templates/page/header.phtml b/app/code/Magento/Backend/view/adminhtml/templates/page/header.phtml
index 0d88328e52d8a..3162bda8daaf1 100644
--- a/app/code/Magento/Backend/view/adminhtml/templates/page/header.phtml
+++ b/app/code/Magento/Backend/view/adminhtml/templates/page/header.phtml
@@ -29,7 +29,7 @@
                 data-mage-init='{"dropdown":{}}'
                 data-toggle="dropdown">
                 <span class="admin__action-dropdown-text">
-                    <span class="admin-user-account-text"><?php echo $block->escapeHtml($block->getUser()->getUsername()); ?></span>
+                    <span class="admin-user-account-text"><?php echo $block->escapeHtml($block->getUser()->getUserName()); ?></span>
                 </span>
             </a>
             <ul class="admin__action-dropdown-menu">
@@ -39,7 +39,7 @@
                         href="<?php /* @escapeNotVerified */ echo $block->getUrl('adminhtml/system_account/index') ?>"
                         <?php /* @escapeNotVerified */ echo $block->getUiId('user', 'account', 'settings')?>
                         title="<?php echo $block->escapeHtml(__('Account Setting')) ?>">
-                        <?php /* @escapeNotVerified */ echo __('Account Setting') ?> (<span class="admin-user-name"><?php echo $block->escapeHtml($block->getUser()->getUsername()); ?></span>)
+                        <?php /* @escapeNotVerified */ echo __('Account Setting') ?> (<span class="admin-user-name"><?php echo $block->escapeHtml($block->getUser()->getUserName()); ?></span>)
                     </a>
                 </li>
                 <?php endif; ?>
diff --git a/app/code/Magento/Backend/view/adminhtml/templates/system/search.phtml b/app/code/Magento/Backend/view/adminhtml/templates/system/search.phtml
index 43e84ed1957ef..d00c2b25c2266 100644
--- a/app/code/Magento/Backend/view/adminhtml/templates/system/search.phtml
+++ b/app/code/Magento/Backend/view/adminhtml/templates/system/search.phtml
@@ -28,16 +28,16 @@
     <script data-template="search-suggest" type="text/x-magento-template">
         <ul class="search-global-menu">
         <li class="item">
-            <a id="searchPreviewProducts" href="<?php /* @escapeNotVerified */ echo $block->getURL('catalog/product/index/'); ?>?search=<%- data.term%>" class="title">"<%- data.term%>" in Products</a>
+            <a id="searchPreviewProducts" href="<?php /* @escapeNotVerified */ echo $block->getUrl('catalog/product/index/'); ?>?search=<%- data.term%>" class="title">"<%- data.term%>" in Products</a>
         </li>
         <li class="item">
-            <a id="searchPreviewOrders" href="<?php /* @escapeNotVerified */ echo $block->getURL('sales/order/index/'); ?>?search=<%- data.term%>" class="title">"<%- data.term%>" in Orders</a>
+            <a id="searchPreviewOrders" href="<?php /* @escapeNotVerified */ echo $block->getUrl('sales/order/index/'); ?>?search=<%- data.term%>" class="title">"<%- data.term%>" in Orders</a>
         </li>
         <li class="item">
-            <a id="searchPreviewCustomers" href="<?php /* @escapeNotVerified */ echo $block->getURL('customer/index/index/'); ?>?search=<%- data.term%>" class="title">"<%- data.term%>" in Customers</a>
+            <a id="searchPreviewCustomers" href="<?php /* @escapeNotVerified */ echo $block->getUrl('customer/index/index/'); ?>?search=<%- data.term%>" class="title">"<%- data.term%>" in Customers</a>
         </li>
         <li class="item">
-            <a id="searchPreviewPages" href="<?php /* @escapeNotVerified */ echo $block->getURL('cms/page/index/'); ?>?search=<%- data.term%>" class="title">"<%- data.term%>" in Pages</a>
+            <a id="searchPreviewPages" href="<?php /* @escapeNotVerified */ echo $block->getUrl('cms/page/index/'); ?>?search=<%- data.term%>" class="title">"<%- data.term%>" in Pages</a>
         </li>
             <% if (data.items.length) { %>
             <% _.each(data.items, function(value){ %>
diff --git a/app/code/Magento/Backend/view/adminhtml/templates/widget/grid/extended.phtml b/app/code/Magento/Backend/view/adminhtml/templates/widget/grid/extended.phtml
index 3e347b5cdb2b7..bbb1d65d04ecd 100644
--- a/app/code/Magento/Backend/view/adminhtml/templates/widget/grid/extended.phtml
+++ b/app/code/Magento/Backend/view/adminhtml/templates/widget/grid/extended.phtml
@@ -72,7 +72,7 @@ $numColumns = sizeof($block->getColumns());
             <?php if ($block->getPagerVisibility()): ?>
                 <div class="admin__data-grid-pager-wrap">
                     <select name="<?php /* @escapeNotVerified */ echo $block->getVarNameLimit() ?>"
-                            id="<?php echo $block->escapeHTML($block->getHtmlId())?>_page-limit"
+                            id="<?php echo $block->escapeHtml($block->getHtmlId())?>_page-limit"
                             onchange="<?php /* @escapeNotVerified */ echo $block->getJsObjectName() ?>.loadByElement(this)"
                             class="admin__control-select">
                         <option value="20"<?php if ($block->getCollection()->getPageSize() == 20): ?>
@@ -91,7 +91,7 @@ $numColumns = sizeof($block->getColumns());
                             selected="selected"<?php endif; ?>>200
                         </option>
                     </select>
-                    <label for="<?php echo $block->escapeHTML($block->getHtmlId())?><?php echo $block->escapeHTML($block->getHtmlId())?>_page-limit"
+                    <label for="<?php echo $block->escapeHtml($block->getHtmlId())?><?php echo $block->escapeHtml($block->getHtmlId())?>_page-limit"
                         class="admin__control-support-text"><?php /* @escapeNotVerified */ echo __('per page') ?></label>
 
                     <div class="admin__data-grid-pager">
@@ -107,12 +107,12 @@ $numColumns = sizeof($block->getColumns());
                             <button type="button" class="action-previous disabled"><span><?php /* @escapeNotVerified */ echo __('Previous page') ?></span></button>
                         <?php endif; ?>
                         <input type="text"
-                               id="<?php echo $block->escapeHTML($block->getHtmlId())?>_page-current"
+                               id="<?php echo $block->escapeHtml($block->getHtmlId())?>_page-current"
                                name="<?php /* @escapeNotVerified */ echo $block->getVarNamePage() ?>"
                                value="<?php /* @escapeNotVerified */ echo $_curPage ?>"
                                class="admin__control-text"
                                onkeypress="<?php /* @escapeNotVerified */ echo $block->getJsObjectName() ?>.inputPage(event, '<?php /* @escapeNotVerified */ echo $_lastPage ?>')" <?php /* @escapeNotVerified */ echo $block->getUiId('current-page') ?> />
-                        <label class="admin__control-support-text" for="<?php echo $block->escapeHTML($block->getHtmlId())?>_page-current">
+                        <label class="admin__control-support-text" for="<?php echo $block->escapeHtml($block->getHtmlId())?>_page-current">
                             <?php /* @escapeNotVerified */ echo __('of %1', '<span>' . $block->getCollection()->getLastPageNumber() . '</span>') ?>
                         </label>
                         <?php if ($_curPage < $_lastPage): ?>
diff --git a/app/code/Magento/Braintree/Gateway/Response/CardDetailsHandler.php b/app/code/Magento/Braintree/Gateway/Response/CardDetailsHandler.php
index 99cfac856723a..ceec6c3ce5b8c 100644
--- a/app/code/Magento/Braintree/Gateway/Response/CardDetailsHandler.php
+++ b/app/code/Magento/Braintree/Gateway/Response/CardDetailsHandler.php
@@ -86,7 +86,7 @@ public function handle(array $handlingSubject, array $response)
     private function getCreditCardType($type)
     {
         $replaced = str_replace(' ', '-', strtolower($type));
-        $mapper = $this->config->getCctypesMapper();
+        $mapper = $this->config->getCcTypesMapper();
 
         return $mapper[$replaced];
     }
diff --git a/app/code/Magento/Braintree/Gateway/Response/VaultDetailsHandler.php b/app/code/Magento/Braintree/Gateway/Response/VaultDetailsHandler.php
index c139d2a22370f..6c066ef113f3c 100644
--- a/app/code/Magento/Braintree/Gateway/Response/VaultDetailsHandler.php
+++ b/app/code/Magento/Braintree/Gateway/Response/VaultDetailsHandler.php
@@ -146,7 +146,7 @@ private function convertDetailsToJSON($details)
     private function getCreditCardType($type)
     {
         $replaced = str_replace(' ', '-', strtolower($type));
-        $mapper = $this->config->getCctypesMapper();
+        $mapper = $this->config->getCcTypesMapper();
 
         return $mapper[$replaced];
     }
diff --git a/app/code/Magento/Braintree/Model/Ui/ConfigProvider.php b/app/code/Magento/Braintree/Model/Ui/ConfigProvider.php
index a9bb1d785ca8b..b39cd2d8525af 100644
--- a/app/code/Magento/Braintree/Model/Ui/ConfigProvider.php
+++ b/app/code/Magento/Braintree/Model/Ui/ConfigProvider.php
@@ -84,7 +84,7 @@ public function getConfig()
                 self::CODE => [
                     'isActive' => $this->config->isActive($storeId),
                     'clientToken' => $this->getClientToken(),
-                    'ccTypesMapper' => $this->config->getCctypesMapper(),
+                    'ccTypesMapper' => $this->config->getCcTypesMapper(),
                     'sdkUrl' => $this->config->getSdkUrl(),
                     'countrySpecificCardTypes' => $this->config->getCountrySpecificCardTypeConfig($storeId),
                     'availableCardTypes' => $this->config->getAvailableCardTypes($storeId),
diff --git a/app/code/Magento/Braintree/Test/Unit/Gateway/Config/ConfigTest.php b/app/code/Magento/Braintree/Test/Unit/Gateway/Config/ConfigTest.php
index cbcb248365ca7..0d2f0d89b3498 100644
--- a/app/code/Magento/Braintree/Test/Unit/Gateway/Config/ConfigTest.php
+++ b/app/code/Magento/Braintree/Test/Unit/Gateway/Config/ConfigTest.php
@@ -118,7 +118,7 @@ public function testGetCcTypesMapper($value, $expected)
 
         static::assertEquals(
             $expected,
-            $this->model->getCctypesMapper()
+            $this->model->getCcTypesMapper()
         );
     }
 
diff --git a/app/code/Magento/Catalog/Block/Product/View/Options/Type/Select.php b/app/code/Magento/Catalog/Block/Product/View/Options/Type/Select.php
index b45c0b4b971b3..ff8088002c1ce 100644
--- a/app/code/Magento/Catalog/Block/Product/View/Options/Type/Select.php
+++ b/app/code/Magento/Catalog/Block/Product/View/Options/Type/Select.php
@@ -44,9 +44,9 @@ public function getValuesHtml()
                 ]
             );
             if ($_option->getType() == \Magento\Catalog\Model\Product\Option::OPTION_TYPE_DROP_DOWN) {
-                $select->setName('options[' . $_option->getid() . ']')->addOption('', __('-- Please Select --'));
+                $select->setName('options[' . $_option->getId() . ']')->addOption('', __('-- Please Select --'));
             } else {
-                $select->setName('options[' . $_option->getid() . '][]');
+                $select->setName('options[' . $_option->getId() . '][]');
                 $select->setClass('multiselect admin__control-multiselect' . $require . ' product-custom-option');
             }
             foreach ($_option->getValues() as $_value) {
diff --git a/app/code/Magento/Catalog/Model/Product/Image.php b/app/code/Magento/Catalog/Model/Product/Image.php
index de34b7a00d799..5205a91219374 100644
--- a/app/code/Magento/Catalog/Model/Product/Image.php
+++ b/app/code/Magento/Catalog/Model/Product/Image.php
@@ -422,7 +422,7 @@ protected function _getNeedMemoryForFile($file = null)
             $imageInfo['bits'] = 8;
         }
         return round(
-            ($imageInfo[0] * $imageInfo[1] * $imageInfo['bits'] * $imageInfo['channels'] / 8 + Pow(2, 16)) * 1.65
+            ($imageInfo[0] * $imageInfo[1] * $imageInfo['bits'] * $imageInfo['channels'] / 8 + pow(2, 16)) * 1.65
         );
     }
 
diff --git a/app/code/Magento/Catalog/Test/Unit/Controller/Adminhtml/Product/ShowUpdateResultTest.php b/app/code/Magento/Catalog/Test/Unit/Controller/Adminhtml/Product/ShowUpdateResultTest.php
index 3f2f6ed7c5823..8127e5ea6bf5a 100644
--- a/app/code/Magento/Catalog/Test/Unit/Controller/Adminhtml/Product/ShowUpdateResultTest.php
+++ b/app/code/Magento/Catalog/Test/Unit/Controller/Adminhtml/Product/ShowUpdateResultTest.php
@@ -58,7 +58,7 @@ protected function getContext()
         $objectManagerMock = $this->getMockForAbstractClass('Magento\Framework\ObjectManagerInterface');
         $objectManagerMock->expects($this->any())
             ->method('get')
-            ->willreturn($productActionMock);
+            ->willReturn($productActionMock);
 
         $eventManager = $this->getMockForAbstractClass('Magento\Framework\Event\Manager', ['dispatch'], '', false);
 
diff --git a/app/code/Magento/Catalog/view/adminhtml/templates/catalog/product/tab/inventory.phtml b/app/code/Magento/Catalog/view/adminhtml/templates/catalog/product/tab/inventory.phtml
index 64bad0a7faa3a..d2dbebda78cc1 100644
--- a/app/code/Magento/Catalog/view/adminhtml/templates/catalog/product/tab/inventory.phtml
+++ b/app/code/Magento/Catalog/view/adminhtml/templates/catalog/product/tab/inventory.phtml
@@ -27,7 +27,7 @@
             <option value="0"<?php if ($block->getFieldValue('manage_stock') == 0): ?> selected="selected"<?php endif; ?>><?php /* @escapeNotVerified */ echo __('No') ?></option>
         </select>
         <input type="hidden" id="inventory_manage_stock_default" value="<?php /* @escapeNotVerified */ echo $block->getDefaultConfigValue('manage_stock'); ?>">
-        <?php $_checked = ($block->getFieldValue('use_config_manage_stock') || $block->IsNew()) ? 'checked="checked"' : '' ?>
+        <?php $_checked = ($block->getFieldValue('use_config_manage_stock') || $block->isNew()) ? 'checked="checked"' : '' ?>
         <input type="checkbox" id="inventory_use_config_manage_stock" name="<?php /* @escapeNotVerified */ echo $block->getFieldSuffix() ?>[stock_data][use_config_manage_stock]" value="1" <?php /* @escapeNotVerified */ echo $_checked ?> onclick="toggleValueElements(this, this.parentNode);" <?php /* @escapeNotVerified */ echo $_readonly;?>>
         <label for="inventory_use_config_manage_stock"><?php /* @escapeNotVerified */ echo __('Use Config Settings') ?></label>
         <?php if (!$block->isReadonly()): ?>
@@ -67,7 +67,7 @@ toggleValueElements($('inventory_use_config_manage_stock'), $('inventory_use_con
         <input type="text" class="input-text validate-number" id="inventory_min_qty" name="<?php /* @escapeNotVerified */ echo $block->getFieldSuffix() ?>[stock_data][min_qty]" value="<?php /* @escapeNotVerified */ echo $block->getFieldValue('min_qty') * 1 ?>" <?php /* @escapeNotVerified */ echo $_readonly;?>>
 
         <div class="control-inner-wrap">
-            <?php $_checked = ($block->getFieldValue('use_config_min_qty') || $block->IsNew()) ? 'checked="checked"' : '' ?>
+            <?php $_checked = ($block->getFieldValue('use_config_min_qty') || $block->isNew()) ? 'checked="checked"' : '' ?>
             <input type="checkbox" id="inventory_use_config_min_qty" name="<?php /* @escapeNotVerified */ echo $block->getFieldSuffix() ?>[stock_data][use_config_min_qty]" value="1" <?php /* @escapeNotVerified */ echo $_checked ?> onclick="toggleValueElements(this, this.parentNode);" <?php /* @escapeNotVerified */ echo $_readonly;?>>
             <label for="inventory_use_config_min_qty"><?php /* @escapeNotVerified */ echo __('Use Config Settings') ?></label>
         </div>
@@ -94,7 +94,7 @@ toggleValueElements($('inventory_use_config_min_qty'), $('inventory_use_config_m
                name="<?php /* @escapeNotVerified */ echo $block->getFieldSuffix() ?>[stock_data][min_sale_qty]"
                value="<?php /* @escapeNotVerified */ echo $block->getFieldValue('min_sale_qty') * 1 ?>" <?php /* @escapeNotVerified */ echo $_readonly;?>>
         <div class="control-inner-wrap">
-        <?php $_checked = ($block->getFieldValue('use_config_min_sale_qty') || $block->IsNew()) ? 'checked="checked"' : '' ?>
+        <?php $_checked = ($block->getFieldValue('use_config_min_sale_qty') || $block->isNew()) ? 'checked="checked"' : '' ?>
             <input type="checkbox" id="inventory_use_config_min_sale_qty" name="<?php /* @escapeNotVerified */ echo $block->getFieldSuffix() ?>[stock_data][use_config_min_sale_qty]" value="1" <?php /* @escapeNotVerified */ echo $_checked ?> onclick="toggleValueElements(this, this.parentNode);" class="checkbox" <?php /* @escapeNotVerified */ echo $_readonly;?>>
             <label for="inventory_use_config_min_sale_qty"><?php /* @escapeNotVerified */ echo __('Use Config Settings') ?></label>
         </div>
@@ -117,7 +117,7 @@ toggleValueElements($('inventory_use_config_min_sale_qty'), $('inventory_use_con
     </label>
     <div class="control">
         <input type="text" class="input-text validate-number" id="inventory_max_sale_qty" name="<?php /* @escapeNotVerified */ echo $block->getFieldSuffix() ?>[stock_data][max_sale_qty]" value="<?php /* @escapeNotVerified */ echo $block->getFieldValue('max_sale_qty') * 1 ?>" <?php /* @escapeNotVerified */ echo $_readonly;?>>
-        <?php $_checked = ($block->getFieldValue('use_config_max_sale_qty') || $block->IsNew()) ? 'checked="checked"' : '' ?>
+        <?php $_checked = ($block->getFieldValue('use_config_max_sale_qty') || $block->isNew()) ? 'checked="checked"' : '' ?>
         <div class="control-inner-wrap">
             <input type="checkbox" id="inventory_use_config_max_sale_qty" name="<?php /* @escapeNotVerified */ echo $block->getFieldSuffix() ?>[stock_data][use_config_max_sale_qty]" value="1" <?php /* @escapeNotVerified */ echo $_checked ?> onclick="toggleValueElements(this, this.parentNode);" class="checkbox" <?php /* @escapeNotVerified */ echo $_readonly;?>>
             <label for="inventory_use_config_max_sale_qty"><?php /* @escapeNotVerified */ echo __('Use Config Settings') ?></label>
@@ -182,7 +182,7 @@ toggleValueElements($('inventory_use_config_max_sale_qty'), $('inventory_use_con
         </select>
 
         <div class="control-inner-wrap">
-            <?php $_checked = ($block->getFieldValue('use_config_backorders') || $block->IsNew()) ? 'checked="checked"' : '' ?>
+            <?php $_checked = ($block->getFieldValue('use_config_backorders') || $block->isNew()) ? 'checked="checked"' : '' ?>
             <input type="checkbox" id="inventory_use_config_backorders" name="<?php /* @escapeNotVerified */ echo $block->getFieldSuffix() ?>[stock_data][use_config_backorders]" value="1" <?php /* @escapeNotVerified */ echo $_checked ?> onclick="toggleValueElements(this, this.parentNode);" <?php /* @escapeNotVerified */ echo $_readonly;?>>
             <label for="inventory_use_config_backorders"><?php /* @escapeNotVerified */ echo __('Use Config Settings') ?></label>
         </div>
@@ -207,7 +207,7 @@ toggleValueElements($('inventory_use_config_backorders'), $('inventory_use_confi
         <input type="text" class="input-text validate-number" id="inventory_notify_stock_qty" name="<?php /* @escapeNotVerified */ echo $block->getFieldSuffix() ?>[stock_data][notify_stock_qty]" value="<?php /* @escapeNotVerified */ echo $block->getFieldValue('notify_stock_qty') * 1 ?>" <?php /* @escapeNotVerified */ echo $_readonly;?>>
 
         <div class="control-inner-wrap">
-            <?php $_checked = ($block->getFieldValue('use_config_notify_stock_qty') || $block->IsNew()) ? 'checked="checked"' : '' ?>
+            <?php $_checked = ($block->getFieldValue('use_config_notify_stock_qty') || $block->isNew()) ? 'checked="checked"' : '' ?>
             <input type="checkbox" id="inventory_use_config_notify_stock_qty" name="<?php /* @escapeNotVerified */ echo $block->getFieldSuffix() ?>[stock_data][use_config_notify_stock_qty]" value="1" <?php /* @escapeNotVerified */ echo $_checked ?> onclick="toggleValueElements(this, this.parentNode);" <?php /* @escapeNotVerified */ echo $_readonly;?>>
             <label for="inventory_use_config_notify_stock_qty"><?php /* @escapeNotVerified */ echo __('Use Config Settings') ?></label>
         </div>
@@ -238,7 +238,7 @@ toggleValueElements($('inventory_use_config_notify_stock_qty'), $('inventory_use
         <input type="hidden" id="inventory_enable_qty_increments_default" value="<?php /* @escapeNotVerified */ echo $block->getDefaultConfigValue('enable_qty_increments'); ?>">
 
         <div class="control-inner-wrap">
-            <?php $_checked = ($block->getFieldValue('use_config_enable_qty_inc') || $block->IsNew()) ? 'checked="checked"' : '' ?>
+            <?php $_checked = ($block->getFieldValue('use_config_enable_qty_inc') || $block->isNew()) ? 'checked="checked"' : '' ?>
             <input type="checkbox" id="inventory_use_config_enable_qty_increments" name="<?php /* @escapeNotVerified */ echo $block->getFieldSuffix() ?>[stock_data][use_config_enable_qty_increments]" value="1" <?php /* @escapeNotVerified */ echo $_checked ?> onclick="toggleValueElements(this, this.parentNode);" <?php /* @escapeNotVerified */ echo $_readonly;?>>
             <label for="inventory_use_config_enable_qty_increments"><?php /* @escapeNotVerified */ echo __('Use Config Settings') ?></label>
         </div>
@@ -262,7 +262,7 @@ toggleValueElements($('inventory_use_config_enable_qty_increments'), $('inventor
     <div class="control">
         <input type="text" class="input-text validate-digits" id="inventory_qty_increments" name="<?php /* @escapeNotVerified */ echo $block->getFieldSuffix() ?>[stock_data][qty_increments]" value="<?php /* @escapeNotVerified */ echo $block->getFieldValue('qty_increments') * 1 ?>" <?php /* @escapeNotVerified */ echo $_readonly;?>>
         <div class="control-inner-wrap">
-            <?php $_checked = ($block->getFieldValue('use_config_qty_increments') || $block->IsNew()) ? 'checked="checked"' : '' ?>
+            <?php $_checked = ($block->getFieldValue('use_config_qty_increments') || $block->isNew()) ? 'checked="checked"' : '' ?>
             <input type="checkbox" id="inventory_use_config_qty_increments" name="<?php /* @escapeNotVerified */ echo $block->getFieldSuffix() ?>[stock_data][use_config_qty_increments]" value="1" <?php /* @escapeNotVerified */ echo $_checked ?> onclick="toggleValueElements(this, this.parentNode);" <?php /* @escapeNotVerified */ echo $_readonly;?>>
             <label for="inventory_use_config_qty_increments"><?php /* @escapeNotVerified */ echo __('Use Config Settings') ?></label>
         </div>
diff --git a/app/code/Magento/Checkout/Setup/InstallData.php b/app/code/Magento/Checkout/Setup/InstallData.php
index 38879e06d65ac..58b118c482307 100644
--- a/app/code/Magento/Checkout/Setup/InstallData.php
+++ b/app/code/Magento/Checkout/Setup/InstallData.php
@@ -816,7 +816,7 @@ public function install(ModuleDataSetupInterface $setup, ModuleContextInterface
 
                 $connection->commit();
             } catch (\Exception $e) {
-                $connection->rollback();
+                $connection->rollBack();
                 throw $e;
             }
         }
diff --git a/app/code/Magento/Customer/Block/Adminhtml/Edit/Tab/Newsletter.php b/app/code/Magento/Customer/Block/Adminhtml/Edit/Tab/Newsletter.php
index b1027843aa579..d75aee4fdccba 100644
--- a/app/code/Magento/Customer/Block/Adminhtml/Edit/Tab/Newsletter.php
+++ b/app/code/Magento/Customer/Block/Adminhtml/Edit/Tab/Newsletter.php
@@ -160,7 +160,7 @@ public function initForm()
             ]
         );
 
-        if ($this->customerAccountManagement->isReadOnly($customerId)) {
+        if ($this->customerAccountManagement->isReadonly($customerId)) {
             $form->getElement('subscription')->setReadonly(true, true);
         }
         $isSubscribed = $subscriber->isSubscribed();
diff --git a/app/code/Magento/Downloadable/Model/LinkRepository.php b/app/code/Magento/Downloadable/Model/LinkRepository.php
index 6df148e7796e9..9784b1a251351 100644
--- a/app/code/Magento/Downloadable/Model/LinkRepository.php
+++ b/app/code/Magento/Downloadable/Model/LinkRepository.php
@@ -207,7 +207,7 @@ protected function saveLink(
         $isGlobalScopeContent
     ) {
         $linkData = [
-            'link_id' => (int)$link->getid(),
+            'link_id' => (int)$link->getId(),
             'is_delete' => 0,
             'type' => $link->getLinkType(),
             'sort_order' => $link->getSortOrder(),
diff --git a/app/code/Magento/Downloadable/Model/SampleRepository.php b/app/code/Magento/Downloadable/Model/SampleRepository.php
index a1840c2124b34..2239567e79998 100644
--- a/app/code/Magento/Downloadable/Model/SampleRepository.php
+++ b/app/code/Magento/Downloadable/Model/SampleRepository.php
@@ -215,7 +215,7 @@ protected function saveSample(
         $isGlobalScopeContent
     ) {
         $sampleData = [
-            'sample_id' => (int)$sample->getid(),
+            'sample_id' => (int)$sample->getId(),
             'is_delete' => 0,
             'type' => $sample->getSampleType(),
             'sort_order' => $sample->getSortOrder(),
diff --git a/app/code/Magento/Eav/Model/Entity/AbstractEntity.php b/app/code/Magento/Eav/Model/Entity/AbstractEntity.php
index 7d0cdad11b03d..4c7514ecbb59b 100644
--- a/app/code/Magento/Eav/Model/Entity/AbstractEntity.php
+++ b/app/code/Magento/Eav/Model/Entity/AbstractEntity.php
@@ -1695,7 +1695,7 @@ public function saveAttribute(\Magento\Framework\DataObject $object, $attributeC
             $this->_processAttributeValues();
             $connection->commit();
         } catch (\Exception $e) {
-            $connection->rollback();
+            $connection->rollBack();
             throw $e;
         }
 
diff --git a/app/code/Magento/Eav/Test/Unit/Model/ResourceModel/Attribute/CollectionTest.php b/app/code/Magento/Eav/Test/Unit/Model/ResourceModel/Attribute/CollectionTest.php
index 9473dca435529..5d9d0fc6639a2 100644
--- a/app/code/Magento/Eav/Test/Unit/Model/ResourceModel/Attribute/CollectionTest.php
+++ b/app/code/Magento/Eav/Test/Unit/Model/ResourceModel/Attribute/CollectionTest.php
@@ -123,7 +123,7 @@ protected function setUp()
             ->will($this->returnArgument(0));
         $this->connectionMock->expects($this->any())
             ->method('describeTable')
-            ->will($this->returnvalueMap(
+            ->will($this->returnValueMap(
                 [
                     [
                         'some_main_table',
diff --git a/app/code/Magento/NewRelicReporting/Model/Observer/ReportConcurrentAdmins.php b/app/code/Magento/NewRelicReporting/Model/Observer/ReportConcurrentAdmins.php
index 615c80633cb0f..9dfd0e1e3319a 100644
--- a/app/code/Magento/NewRelicReporting/Model/Observer/ReportConcurrentAdmins.php
+++ b/app/code/Magento/NewRelicReporting/Model/Observer/ReportConcurrentAdmins.php
@@ -66,8 +66,8 @@ public function execute(Observer $observer)
                 $user = $this->backendAuthSession->getUser();
                 $jsonData = [
                     'id' => $user->getId(),
-                    'username' => $user->getUsername(),
-                    'name' => $user->getFirstname() . ' ' . $user->getLastname(),
+                    'username' => $user->getUserName(),
+                    'name' => $user->getFirstName() . ' ' . $user->getLastName(),
                 ];
 
                 $modelData = [
diff --git a/app/code/Magento/NewRelicReporting/Model/Observer/ReportConcurrentAdminsToNewRelic.php b/app/code/Magento/NewRelicReporting/Model/Observer/ReportConcurrentAdminsToNewRelic.php
index cff1b159d481d..2f142f6ac8124 100644
--- a/app/code/Magento/NewRelicReporting/Model/Observer/ReportConcurrentAdminsToNewRelic.php
+++ b/app/code/Magento/NewRelicReporting/Model/Observer/ReportConcurrentAdminsToNewRelic.php
@@ -58,10 +58,10 @@ public function execute(Observer $observer)
             if ($this->backendAuthSession->isLoggedIn()) {
                 $user = $this->backendAuthSession->getUser();
                 $this->newRelicWrapper->addCustomParameter(Config::ADMIN_USER_ID, $user->getId());
-                $this->newRelicWrapper->addCustomParameter(Config::ADMIN_USER, $user->getUsername());
+                $this->newRelicWrapper->addCustomParameter(Config::ADMIN_USER, $user->getUserName());
                 $this->newRelicWrapper->addCustomParameter(
                     Config::ADMIN_NAME,
-                    $user->getFirstname() . ' ' . $user->getLastname()
+                    $user->getFirstName() . ' ' . $user->getLastName()
                 );
             }
         }
diff --git a/app/code/Magento/NewRelicReporting/Model/Observer/ReportSystemCacheFlushToNewRelic.php b/app/code/Magento/NewRelicReporting/Model/Observer/ReportSystemCacheFlushToNewRelic.php
index 0e3ad1605f948..5500aba195936 100644
--- a/app/code/Magento/NewRelicReporting/Model/Observer/ReportSystemCacheFlushToNewRelic.php
+++ b/app/code/Magento/NewRelicReporting/Model/Observer/ReportSystemCacheFlushToNewRelic.php
@@ -58,8 +58,8 @@ public function execute(Observer $observer)
             if ($user->getId()) {
                 $this->deploymentsFactory->create()->setDeployment(
                     'Cache Flush',
-                    $user->getUsername() . ' flushed the cache.',
-                    $user->getUsername()
+                    $user->getUserName() . ' flushed the cache.',
+                    $user->getUserName()
                 );
             }
         }
diff --git a/app/code/Magento/Newsletter/Model/ResourceModel/Problem/Collection.php b/app/code/Magento/Newsletter/Model/ResourceModel/Problem/Collection.php
index da1ee66bee6c8..1da56fd581e40 100644
--- a/app/code/Magento/Newsletter/Model/ResourceModel/Problem/Collection.php
+++ b/app/code/Magento/Newsletter/Model/ResourceModel/Problem/Collection.php
@@ -160,8 +160,8 @@ protected function _addCustomersData()
                     $customerName = $this->_customerView->getCustomerName($customer);
                     foreach ($problems as $problem) {
                         $problem->setCustomerName($customerName)
-                            ->setCustomerFirstName($customer->getFirstName())
-                            ->setCustomerLastName($customer->getLastName());
+                            ->setCustomerFirstName($customer->getFirstname())
+                            ->setCustomerLastName($customer->getLastname());
                     }
                 } catch (NoSuchEntityException $e) {
                     // do nothing if customer is not found by id
diff --git a/app/code/Magento/Newsletter/Model/ResourceModel/Queue/Collection.php b/app/code/Magento/Newsletter/Model/ResourceModel/Queue/Collection.php
index 99ef9ffbf2710..7c33b1a48e259 100644
--- a/app/code/Magento/Newsletter/Model/ResourceModel/Queue/Collection.php
+++ b/app/code/Magento/Newsletter/Model/ResourceModel/Queue/Collection.php
@@ -218,7 +218,7 @@ public function addOnlyForSendingFilter()
             [\Magento\Newsletter\Model\Queue::STATUS_SENDING, \Magento\Newsletter\Model\Queue::STATUS_NEVER]
         )->where(
             'main_table.queue_start_at < ?',
-            $this->_date->gmtdate()
+            $this->_date->gmtDate()
         )->where(
             'main_table.queue_start_at IS NOT NULL'
         );
diff --git a/app/code/Magento/OfflineShipping/Model/ResourceModel/Carrier/Tablerate.php b/app/code/Magento/OfflineShipping/Model/ResourceModel/Carrier/Tablerate.php
index 56e1eb6aee907..c66f32ccbb943 100644
--- a/app/code/Magento/OfflineShipping/Model/ResourceModel/Carrier/Tablerate.php
+++ b/app/code/Magento/OfflineShipping/Model/ResourceModel/Carrier/Tablerate.php
@@ -224,10 +224,10 @@ private function importData(array $fields, array $values)
                 $this->_importedRows += count($values);
             }
         } catch (\Magento\Framework\Exception\LocalizedException $e) {
-            $connection->rollback();
+            $connection->rollBack();
             throw new \Magento\Framework\Exception\LocalizedException(__('Unable to import data'), $e);
         } catch (\Exception $e) {
-            $connection->rollback();
+            $connection->rollBack();
             $this->logger->critical($e);
             throw new \Magento\Framework\Exception\LocalizedException(
                 __('Something went wrong while importing table rates.')
diff --git a/app/code/Magento/Paypal/Model/ResourceModel/Report/Settlement.php b/app/code/Magento/Paypal/Model/ResourceModel/Report/Settlement.php
index 0796c22db98bf..d4019c6c4a7e0 100644
--- a/app/code/Magento/Paypal/Model/ResourceModel/Report/Settlement.php
+++ b/app/code/Magento/Paypal/Model/ResourceModel/Report/Settlement.php
@@ -90,7 +90,7 @@ protected function _afterSave(\Magento\Framework\Model\AbstractModel $object)
                 }
                 $connection->commit();
             } catch (\Exception $e) {
-                $connection->rollback();
+                $connection->rollBack();
             }
         }
 
diff --git a/app/code/Magento/Quote/Test/Unit/Model/GuestCart/GuestCartManagementTest.php b/app/code/Magento/Quote/Test/Unit/Model/GuestCart/GuestCartManagementTest.php
index 7468e428ba83f..30c275f35d2cf 100644
--- a/app/code/Magento/Quote/Test/Unit/Model/GuestCart/GuestCartManagementTest.php
+++ b/app/code/Magento/Quote/Test/Unit/Model/GuestCart/GuestCartManagementTest.php
@@ -100,7 +100,7 @@ public function testCreateEmptyCart()
         $cartId = 1;
         $this->quoteIdMaskMock->expects($this->once())->method('setQuoteId')->with($cartId)->willReturnSelf();
         $this->quoteIdMaskMock->expects($this->once())->method('save')->willReturnSelf();
-        $this->quoteIdMaskMock->expects($this->once())->method('getMaskedId')->willreturn($maskedCartId);
+        $this->quoteIdMaskMock->expects($this->once())->method('getMaskedId')->willReturn($maskedCartId);
         $this->quoteIdMaskFactoryMock->expects($this->once())->method('create')->willReturn($this->quoteIdMaskMock);
         $this->quoteManagementMock->expects($this->once())->method('createEmptyCart')->willReturn($cartId);
 
diff --git a/app/code/Magento/Review/Model/ResourceModel/Rating/Option.php b/app/code/Magento/Review/Model/ResourceModel/Rating/Option.php
index 3100c4fa5a686..c835be9c3078f 100644
--- a/app/code/Magento/Review/Model/ResourceModel/Rating/Option.php
+++ b/app/code/Magento/Review/Model/ResourceModel/Rating/Option.php
@@ -153,7 +153,7 @@ public function addVote($option)
             }
             $connection->commit();
         } catch (\Exception $e) {
-            $connection->rollback();
+            $connection->rollBack();
             throw new \Exception($e->getMessage());
         }
         return $this;
diff --git a/app/code/Magento/Rule/Model/ResourceModel/AbstractResource.php b/app/code/Magento/Rule/Model/ResourceModel/AbstractResource.php
index e698c9a2b73bd..dfb8e9809ade0 100644
--- a/app/code/Magento/Rule/Model/ResourceModel/AbstractResource.php
+++ b/app/code/Magento/Rule/Model/ResourceModel/AbstractResource.php
@@ -80,7 +80,7 @@ public function bindRuleToEntity($ruleIds, $entityIds, $entityType)
         try {
             $this->_multiplyBunchInsert($ruleIds, $entityIds, $entityType);
         } catch (\Exception $e) {
-            $this->getConnection()->rollback();
+            $this->getConnection()->rollBack();
             throw $e;
         }
 
diff --git a/app/code/Magento/Sales/Block/Adminhtml/Order/View.php b/app/code/Magento/Sales/Block/Adminhtml/Order/View.php
index a4fc2bea7bb7f..7a5116b3ced32 100644
--- a/app/code/Magento/Sales/Block/Adminhtml/Order/View.php
+++ b/app/code/Magento/Sales/Block/Adminhtml/Order/View.php
@@ -180,7 +180,7 @@ protected function _construct()
                     'class' => __('unhold'),
                     'id' => 'order-view-unhold-button',
                     'data_attribute' => [
-                        'url' => $this->getUnHoldUrl()
+                        'url' => $this->getUnholdUrl()
                     ]
                 ]
             );
diff --git a/app/code/Magento/Sales/Controller/Adminhtml/Order/Unhold.php b/app/code/Magento/Sales/Controller/Adminhtml/Order/Unhold.php
index 752ab088689c8..fa9676856a442 100644
--- a/app/code/Magento/Sales/Controller/Adminhtml/Order/Unhold.php
+++ b/app/code/Magento/Sales/Controller/Adminhtml/Order/Unhold.php
@@ -32,7 +32,7 @@ public function execute()
                 if (!$order->canUnhold()) {
                     throw new \Magento\Framework\Exception\LocalizedException(__('Can\'t unhold order.'));
                 }
-                $this->orderManagement->unhold($order->getEntityId());
+                $this->orderManagement->unHold($order->getEntityId());
                 $this->messageManager->addSuccess(__('You released the order from holding status.'));
             } catch (\Magento\Framework\Exception\LocalizedException $e) {
                 $this->messageManager->addError($e->getMessage());
diff --git a/app/code/Magento/Sales/Test/Unit/Block/Order/Create/TotalsTest.php b/app/code/Magento/Sales/Test/Unit/Block/Order/Create/TotalsTest.php
index 354dd094c403e..d49c8b7e87b4e 100644
--- a/app/code/Magento/Sales/Test/Unit/Block/Order/Create/TotalsTest.php
+++ b/app/code/Magento/Sales/Test/Unit/Block/Order/Create/TotalsTest.php
@@ -70,10 +70,10 @@ protected function setUp()
 
         $this->quoteMock->expects($this->any())
             ->method('getBillingAddress')
-            ->willreturn($this->billingAddressMock);
+            ->willReturn($this->billingAddressMock);
         $this->quoteMock->expects($this->any())
             ->method('getShippingAddress')
-            ->willreturn($this->shippingAddressMock);
+            ->willReturn($this->shippingAddressMock);
         $this->sessionQuoteMock->expects($this->any())->method('getQuote')->willReturn($this->quoteMock);
         $this->totals = $this->helperManager->getObject(
             'Magento\Sales\Block\Adminhtml\Order\Create\Totals',
@@ -89,7 +89,7 @@ public function testGetTotals($isVirtual)
         $expected = 'expected';
         $this->quoteMock->expects($this->at(0))->method('setTotalsCollectedFlag')->with(false);
         $this->quoteMock->expects($this->at(1))->method('collectTotals');
-        $this->quoteMock->expects($this->once())->method('isVirtual')->willreturn($isVirtual);
+        $this->quoteMock->expects($this->once())->method('isVirtual')->willReturn($isVirtual);
         if ($isVirtual) {
             $this->billingAddressMock->expects($this->once())->method('getTotals')->willReturn($expected);
         } else {
diff --git a/app/code/Magento/SalesRule/Model/ResourceModel/Rule.php b/app/code/Magento/SalesRule/Model/ResourceModel/Rule.php
index 7446bd0707fcc..b26513df6cb45 100644
--- a/app/code/Magento/SalesRule/Model/ResourceModel/Rule.php
+++ b/app/code/Magento/SalesRule/Model/ResourceModel/Rule.php
@@ -221,7 +221,7 @@ public function saveStoreLabels($ruleId, $labels)
                 $connection->delete($table, ['rule_id=?' => $ruleId, 'store_id IN (?)' => $deleteByStoreIds]);
             }
         } catch (\Exception $e) {
-            $connection->rollback();
+            $connection->rollBack();
             throw $e;
         }
         $connection->commit();
diff --git a/app/code/Magento/Shipping/Model/Shipping/Labels.php b/app/code/Magento/Shipping/Model/Shipping/Labels.php
index 77ec66b74fa28..56a5bb5935697 100644
--- a/app/code/Magento/Shipping/Model/Shipping/Labels.php
+++ b/app/code/Magento/Shipping/Model/Shipping/Labels.php
@@ -117,8 +117,8 @@ public function requestToShipment(Shipment $orderShipment)
             )
         );
 
-        if (!$admin->getFirstname()
-            || !$admin->getLastname()
+        if (!$admin->getFirstName()
+            || !$admin->getLastName()
             || !$storeInfo->getName()
             || !$storeInfo->getPhone()
             || !$originStreet1
@@ -188,8 +188,8 @@ protected function setShipperDetails(
         );
 
         $request->setShipperContactPersonName($storeAdmin->getName());
-        $request->setShipperContactPersonFirstName($storeAdmin->getFirstname());
-        $request->setShipperContactPersonLastName($storeAdmin->getLastname());
+        $request->setShipperContactPersonFirstName($storeAdmin->getFirstName());
+        $request->setShipperContactPersonLastName($storeAdmin->getLastName());
         $request->setShipperContactCompanyName($store->getName());
         $request->setShipperContactPhoneNumber($store->getPhone());
         $request->setShipperEmail($storeAdmin->getEmail());
diff --git a/app/code/Magento/Theme/Test/Unit/Controller/Adminhtml/System/Design/Theme/UploadJsTest.php b/app/code/Magento/Theme/Test/Unit/Controller/Adminhtml/System/Design/Theme/UploadJsTest.php
index 466ac77594d72..0b3bbbfe34094 100644
--- a/app/code/Magento/Theme/Test/Unit/Controller/Adminhtml/System/Design/Theme/UploadJsTest.php
+++ b/app/code/Magento/Theme/Test/Unit/Controller/Adminhtml/System/Design/Theme/UploadJsTest.php
@@ -70,22 +70,22 @@ public function testExecuteWithoutTheme()
             ->expects($this->at(0))
             ->method('get')
             ->with('Magento\Theme\Model\Uploader\Service')
-            ->WillReturn($this->serviceModel);
+            ->willReturn($this->serviceModel);
         $this->_objectManagerMock
             ->expects($this->at(1))
             ->method('get')
             ->with('Magento\Framework\View\Design\Theme\FlyweightFactory')
-            ->WillReturn($this->themeFactory);
+            ->willReturn($this->themeFactory);
         $this->_objectManagerMock
             ->expects($this->at(2))
             ->method('get')
             ->with('Magento\Framework\View\Design\Theme\Customization\File\Js')
-            ->WillReturn($this->customizationJs);
+            ->willReturn($this->customizationJs);
         $this->_objectManagerMock
             ->expects($this->at(3))
             ->method('get')
             ->with('Magento\Framework\Json\Helper\Data')
-            ->WillReturn($this->jsonHelper);
+            ->willReturn($this->jsonHelper);
 
         $this->themeFactory->expects($this->once())
             ->method('create')
@@ -114,21 +114,21 @@ public function testExecuteWithException()
         $this->_objectManagerMock->expects($this->at(0))
             ->method('get')
             ->with('Magento\Theme\Model\Uploader\Service')
-            ->WillReturn($this->serviceModel);
+            ->willReturn($this->serviceModel);
         $this->_objectManagerMock->expects($this->at(1))
             ->method('get')
             ->with('Magento\Framework\View\Design\Theme\FlyweightFactory')
-            ->WillReturn($this->themeFactory);
+            ->willReturn($this->themeFactory);
         $this->_objectManagerMock
             ->expects($this->at(2))
             ->method('get')
             ->with('Magento\Framework\View\Design\Theme\Customization\File\Js')
-            ->WillReturn($this->customizationJs);
+            ->willReturn($this->customizationJs);
         $this->_objectManagerMock
             ->expects($this->at(4))
             ->method('get')
             ->with('Magento\Framework\Json\Helper\Data')
-            ->WillReturn($this->jsonHelper);
+            ->willReturn($this->jsonHelper);
 
         $this->themeFactory->expects($this->once())
             ->method('create')
@@ -179,19 +179,19 @@ public function testExecute()
         $this->_objectManagerMock->expects($this->at(0))
             ->method('get')
             ->with('Magento\Theme\Model\Uploader\Service')
-            ->WillReturn($this->serviceModel);
+            ->willReturn($this->serviceModel);
         $this->_objectManagerMock->expects($this->at(1))
             ->method('get')
             ->with('Magento\Framework\View\Design\Theme\FlyweightFactory')
-            ->WillReturn($this->themeFactory);
+            ->willReturn($this->themeFactory);
         $this->_objectManagerMock->expects($this->at(2))
             ->method('get')
             ->with('Magento\Framework\View\Design\Theme\Customization\File\Js')
-            ->WillReturn($this->customizationJs);
+            ->willReturn($this->customizationJs);
         $this->_objectManagerMock->expects($this->at(4))
             ->method('get')
             ->with('Magento\Framework\Json\Helper\Data')
-            ->WillReturn($this->jsonHelper);
+            ->willReturn($this->jsonHelper);
 
         $this->themeFactory->expects($this->once())
             ->method('create')
diff --git a/app/code/Magento/User/Model/ResourceModel/User.php b/app/code/Magento/User/Model/ResourceModel/User.php
index 1cc2d0d55c24e..ed94baa4d4d62 100644
--- a/app/code/Magento/User/Model/ResourceModel/User.php
+++ b/app/code/Magento/User/Model/ResourceModel/User.php
@@ -208,7 +208,7 @@ protected function _createUserRole($parentId, ModelUser $user)
                     'role_type' => RoleUser::ROLE_TYPE,
                     'user_id' => $user->getId(),
                     'user_type' => UserContextInterface::USER_TYPE_ADMIN,
-                    'role_name' => $user->getFirstname(),
+                    'role_name' => $user->getFirstName(),
                 ]
             );
 
diff --git a/app/code/Magento/User/Model/User.php b/app/code/Magento/User/Model/User.php
index b6848b54c5e44..7447aef6e6f12 100644
--- a/app/code/Magento/User/Model/User.php
+++ b/app/code/Magento/User/Model/User.php
@@ -452,7 +452,7 @@ protected function createChangesDescriptionString()
             $changes[] = __('password');
         }
 
-        if ($this->getUsername() != $this->getOrigData('username') && $this->getOrigData('username')) {
+        if ($this->getUserName() != $this->getOrigData('username') && $this->getOrigData('username')) {
             $changes[] = __('username');
         }
 
@@ -499,7 +499,7 @@ protected function sendUserNotificationEmail($changes, $email = null)
      */
     public function getName($separator = ' ')
     {
-        return $this->getFirstname() . $separator . $this->getLastname();
+        return $this->getFirstName() . $separator . $this->getLastName();
     }
 
     /**
@@ -531,7 +531,7 @@ public function authenticate($username, $password)
                 ['username' => $username, 'user' => $this]
             );
             $this->loadByUsername($username);
-            $sensitive = $config ? $username == $this->getUsername() : true;
+            $sensitive = $config ? $username == $this->getUserName() : true;
             if ($sensitive && $this->getId()) {
                 $result = $this->verifyIdentity($password);
             }
diff --git a/app/code/Magento/User/Test/Unit/Model/ResourceModel/UserTest.php b/app/code/Magento/User/Test/Unit/Model/ResourceModel/UserTest.php
index e9501d377e21d..b978db540185d 100644
--- a/app/code/Magento/User/Test/Unit/Model/ResourceModel/UserTest.php
+++ b/app/code/Magento/User/Test/Unit/Model/ResourceModel/UserTest.php
@@ -323,7 +323,7 @@ public function testDeleteFromRole()
         $roleId = 44;
         $methodUserMock->expects($this->once())->method('getUserId')->willReturn($uid);
         $this->resourceMock->expects($this->atLeastOnce())->method('getConnection')->willReturn($this->dbAdapterMock);
-        $methodUserMock->expects($this->atleastOnce())->method('getRoleId')->willReturn($roleId);
+        $methodUserMock->expects($this->atLeastOnce())->method('getRoleId')->willReturn($roleId);
         $this->dbAdapterMock->expects($this->once())->method('delete');
 
         $this->assertInstanceOf(
diff --git a/app/code/Magento/User/Test/Unit/Model/UserTest.php b/app/code/Magento/User/Test/Unit/Model/UserTest.php
index 752ca64205dee..c581861488e46 100644
--- a/app/code/Magento/User/Test/Unit/Model/UserTest.php
+++ b/app/code/Magento/User/Test/Unit/Model/UserTest.php
@@ -174,11 +174,11 @@ public function testSendNotificationEmailsIfRequired()
         $this->model->setPassword($password);
         $this->model->setOrigData('password', $origPassword);
 
-        $this->model->setUsername($username);
+        $this->model->setUserName($username);
         $this->model->setOrigData('username', $origUsername);
 
-        $this->model->setFirstname($firstName);
-        $this->model->setLastname($lastName);
+        $this->model->setFirstName($firstName);
+        $this->model->setLastName($lastName);
 
         $this->configMock->expects($this->exactly(4))
             ->method('getValue')
@@ -246,8 +246,8 @@ public function testSendPasswordResetConfirmationEmail()
         $lastName = 'Bar';
 
         $this->model->setEmail($email);
-        $this->model->setFirstname($firstName);
-        $this->model->setLastname($lastName);
+        $this->model->setFirstName($firstName);
+        $this->model->setLastName($lastName);
 
         $this->configMock->expects($this->at(0))
             ->method('getValue')
diff --git a/app/code/Magento/Webapi/Model/Soap/Fault.php b/app/code/Magento/Webapi/Model/Soap/Fault.php
index 9761613763f7c..74b1b41ee1bf5 100644
--- a/app/code/Magento/Webapi/Model/Soap/Fault.php
+++ b/app/code/Magento/Webapi/Model/Soap/Fault.php
@@ -357,7 +357,7 @@ protected function _getWrappedErrorsXml($wrappedErrors)
 
         $errorsXml = '';
         foreach ($wrappedErrors as $error) {
-            $errorsXml .= $this->_generateErrorNodeXml($error);
+            $errorsXml .= $this->_generateErrorNodeXML($error);
         }
         if (!empty($errorsXml)) {
             $wrappedErrorsNode = self::NODE_DETAIL_WRAPPED_ERRORS;
diff --git a/lib/internal/Magento/Framework/Api/ExtensionAttributesFactory.php b/lib/internal/Magento/Framework/Api/ExtensionAttributesFactory.php
index 01d9ddd77cec4..38357d142e79e 100644
--- a/lib/internal/Magento/Framework/Api/ExtensionAttributesFactory.php
+++ b/lib/internal/Magento/Framework/Api/ExtensionAttributesFactory.php
@@ -97,7 +97,7 @@ public function getExtensibleInterfaceName($extensibleClassName)
         }
         $modelReflection = new \ReflectionClass($extensibleClassName);
         if ($modelReflection->isInterface()
-            && $modelReflection->isSubClassOf(self::EXTENSIBLE_INTERFACE_NAME)
+            && $modelReflection->isSubclassOf(self::EXTENSIBLE_INTERFACE_NAME)
             && $modelReflection->hasMethod('getExtensionAttributes')
         ) {
             $this->classInterfaceMap[$extensibleClassName] = $extensibleClassName;
diff --git a/lib/internal/Magento/Framework/App/Test/Unit/BootstrapTest.php b/lib/internal/Magento/Framework/App/Test/Unit/BootstrapTest.php
index 305311218cdae..3e1ce350cb770 100644
--- a/lib/internal/Magento/Framework/App/Test/Unit/BootstrapTest.php
+++ b/lib/internal/Magento/Framework/App/Test/Unit/BootstrapTest.php
@@ -128,7 +128,7 @@ public function testCreateFilesystemDriverPool()
         );
         /** @var \Magento\Framework\Filesystem\DriverPool $result */
         $this->assertInstanceOf('Magento\Framework\Filesystem\DriverPool', $result);
-        $this->assertInstanceof($driverClass, $result->getDriver('custom'));
+        $this->assertInstanceOf($driverClass, $result->getDriver('custom'));
     }
 
     public function testGetParams()
diff --git a/lib/internal/Magento/Framework/App/Test/Unit/Request/HttpTest.php b/lib/internal/Magento/Framework/App/Test/Unit/Request/HttpTest.php
index fda01bab489bf..a2e7534d626f6 100644
--- a/lib/internal/Magento/Framework/App/Test/Unit/Request/HttpTest.php
+++ b/lib/internal/Magento/Framework/App/Test/Unit/Request/HttpTest.php
@@ -370,7 +370,7 @@ public function testIsSafeMethodTrue($httpMethod)
     {
         $this->_model = $this->getModel();
         $_SERVER['REQUEST_METHOD'] = $httpMethod;
-        $this->assertEquals(true, $this->_model->IsSafeMethod());
+        $this->assertEquals(true, $this->_model->isSafeMethod());
     }
 
     /**
@@ -382,7 +382,7 @@ public function testIsSafeMethodFalse($httpMethod)
     {
         $this->_model = $this->getModel();
         $_SERVER['REQUEST_METHOD'] = $httpMethod;
-        $this->assertEquals(false, $this->_model->IsSafeMethod());
+        $this->assertEquals(false, $this->_model->isSafeMethod());
     }
 
     public function httpSafeMethodProvider()
diff --git a/lib/internal/Magento/Framework/Image/Adapter/Gd2.php b/lib/internal/Magento/Framework/Image/Adapter/Gd2.php
index eacffe9b60bc1..c11f42a18964c 100644
--- a/lib/internal/Magento/Framework/Image/Adapter/Gd2.php
+++ b/lib/internal/Magento/Framework/Image/Adapter/Gd2.php
@@ -103,7 +103,7 @@ protected function _getImageNeedMemorySize($file)
         }
 
         return round(
-            ($imageInfo[0] * $imageInfo[1] * $imageInfo['bits'] * $imageInfo['channels'] / 8 + Pow(2, 16)) * 1.65
+            ($imageInfo[0] * $imageInfo[1] * $imageInfo['bits'] * $imageInfo['channels'] / 8 + pow(2, 16)) * 1.65
         );
     }
 
@@ -423,7 +423,7 @@ public function watermark($imagePath, $positionX = 0, $positionY = 0, $opacity =
             imagecolortransparent($newWatermark, $col);
             imagefilledrectangle($newWatermark, 0, 0, $this->getWatermarkWidth(), $this->getWatermarkHeight(), $col);
             imagealphablending($newWatermark, true);
-            imageSaveAlpha($newWatermark, true);
+            imagesavealpha($newWatermark, true);
             imagecopyresampled(
                 $newWatermark,
                 $watermark,
@@ -448,7 +448,7 @@ public function watermark($imagePath, $positionX = 0, $positionY = 0, $opacity =
             imagecolortransparent($newWatermark, $col);
             imagefilledrectangle($newWatermark, 0, 0, $this->_imageSrcWidth, $this->_imageSrcHeight, $col);
             imagealphablending($newWatermark, true);
-            imageSaveAlpha($newWatermark, true);
+            imagesavealpha($newWatermark, true);
             imagecopyresampled(
                 $newWatermark,
                 $watermark,
@@ -666,7 +666,7 @@ private function imageDestroy()
     private function _saveAlpha($imageHandler)
     {
         $background = imagecolorallocate($imageHandler, 0, 0, 0);
-        ImageColorTransparent($imageHandler, $background);
+        imagecolortransparent($imageHandler, $background);
         imagealphablending($imageHandler, false);
         imagesavealpha($imageHandler, true);
     }
diff --git a/lib/internal/Magento/Framework/Indexer/Action/Base.php b/lib/internal/Magento/Framework/Indexer/Action/Base.php
index e94650596a05c..67a9a1b792fff 100644
--- a/lib/internal/Magento/Framework/Indexer/Action/Base.php
+++ b/lib/internal/Magento/Framework/Indexer/Action/Base.php
@@ -212,7 +212,7 @@ protected function prepareDataSource(array $ids = [])
     {
         return !count($ids)
             ? $this->createResultCollection()
-            : $this->createResultCollection()->addFieldToFilter($this->getPrimaryResource()->getIdFieldname(), $ids);
+            : $this->createResultCollection()->addFieldToFilter($this->getPrimaryResource()->getIdFieldName(), $ids);
     }
 
     /**
diff --git a/lib/internal/Magento/Framework/RequireJs/Config.php b/lib/internal/Magento/Framework/RequireJs/Config.php
index 850868cdde158..7ebe8b26c2464 100644
--- a/lib/internal/Magento/Framework/RequireJs/Config.php
+++ b/lib/internal/Magento/Framework/RequireJs/Config.php
@@ -136,7 +136,7 @@ public function getConfig()
         $customConfigFiles = $this->fileSource->getFiles($this->design->getDesignTheme(), self::CONFIG_FILE_NAME);
         foreach ($customConfigFiles as $file) {
             /** @var $fileReader \Magento\Framework\Filesystem\File\Read */
-            $fileReader = $this->readFactory->create($file->getFileName(), DriverPool::FILE);
+            $fileReader = $this->readFactory->create($file->getFilename(), DriverPool::FILE);
             $config = $fileReader->readAll($file->getName());
             $distributedConfig .= str_replace(
                 ['%config%', '%context%'],
diff --git a/lib/internal/Magento/Framework/View/Element/UiComponent/Config/FileCollector/AggregatedFileCollector.php b/lib/internal/Magento/Framework/View/Element/UiComponent/Config/FileCollector/AggregatedFileCollector.php
index 17a320164dad3..9ba7833a355d7 100644
--- a/lib/internal/Magento/Framework/View/Element/UiComponent/Config/FileCollector/AggregatedFileCollector.php
+++ b/lib/internal/Magento/Framework/View/Element/UiComponent/Config/FileCollector/AggregatedFileCollector.php
@@ -75,7 +75,7 @@ public function collectFiles($searchPattern = null)
         }
         $files = $this->collectorAggregated->getFiles($this->design->getDesignTheme(), $searchPattern);
         foreach ($files as $file) {
-            $fullFileName = $file->getFileName();
+            $fullFileName = $file->getFilename();
             $fileDir = dirname($fullFileName);
             $fileName = basename($fullFileName);
             $dirRead = $this->readFactory->create($fileDir);
diff --git a/lib/internal/Magento/Framework/View/Model/Layout/Merge.php b/lib/internal/Magento/Framework/View/Model/Layout/Merge.php
index 8148b0e8c019f..d61c09a41c538 100644
--- a/lib/internal/Magento/Framework/View/Model/Layout/Merge.php
+++ b/lib/internal/Magento/Framework/View/Model/Layout/Merge.php
@@ -631,7 +631,7 @@ public function getFileLayoutUpdatesXml()
             $result = $this->_loadXmlString($result);
         } else {
             $result = $this->_loadFileLayoutUpdatesXml();
-            $this->_saveCache($result->asXml(), $cacheId);
+            $this->_saveCache($result->asXML(), $cacheId);
         }
         $this->layoutUpdatesCache = $result;
         return $result;
diff --git a/lib/internal/Magento/Framework/View/Page/Config/Reader/Head.php b/lib/internal/Magento/Framework/View/Page/Config/Reader/Head.php
index 71714084941e3..65b5b37399049 100644
--- a/lib/internal/Magento/Framework/View/Page/Config/Reader/Head.php
+++ b/lib/internal/Magento/Framework/View/Page/Config/Reader/Head.php
@@ -138,6 +138,6 @@ private function setMetadata($pageConfigStructure, $node)
             $metadataName = $node->getAttribute('name');
         }
 
-        $pageConfigStructure->setMetaData($metadataName, $node->getAttribute('content'));
+        $pageConfigStructure->setMetadata($metadataName, $node->getAttribute('content'));
     }
 }
diff --git a/lib/internal/Magento/Framework/View/Test/Unit/Element/Html/Link/CurrentTest.php b/lib/internal/Magento/Framework/View/Test/Unit/Element/Html/Link/CurrentTest.php
index 54222b5908a40..e00b8b1db732e 100644
--- a/lib/internal/Magento/Framework/View/Test/Unit/Element/Html/Link/CurrentTest.php
+++ b/lib/internal/Magento/Framework/View/Test/Unit/Element/Html/Link/CurrentTest.php
@@ -57,7 +57,7 @@ public function testIsCurrentIfIsset()
         /** @var \Magento\Framework\View\Element\Html\Link\Current $link */
         $link = $this->_objectManager->getObject('Magento\Framework\View\Element\Html\Link\Current');
         $link->setCurrent(true);
-        $this->assertTrue($link->IsCurrent());
+        $this->assertTrue($link->isCurrent());
     }
 
     public function testIsCurrent()
diff --git a/lib/internal/Magento/Framework/View/Test/Unit/LayoutTest.php b/lib/internal/Magento/Framework/View/Test/Unit/LayoutTest.php
index d802c2ca6648f..8e9564d6a93fb 100755
--- a/lib/internal/Magento/Framework/View/Test/Unit/LayoutTest.php
+++ b/lib/internal/Magento/Framework/View/Test/Unit/LayoutTest.php
@@ -233,7 +233,7 @@ public function testGenerateXml()
             ->with($this->equalTo([]))
             ->will($this->returnSelf());
         $this->assertSame($this->model, $this->model->generateXml());
-        $this->assertSame('<some_update>123</some_update>', $this->model->getNode('some_update')->asXml());
+        $this->assertSame('<some_update>123</some_update>', $this->model->getNode('some_update')->asXML());
     }
 
     public function testGetChildBlock()
diff --git a/lib/internal/Magento/Framework/Xml/Security.php b/lib/internal/Magento/Framework/Xml/Security.php
index 72af506a3294e..e502429e4511a 100644
--- a/lib/internal/Magento/Framework/Xml/Security.php
+++ b/lib/internal/Magento/Framework/Xml/Security.php
@@ -72,7 +72,7 @@ function ($errno, $errstr) {
             E_WARNING
         );
 
-        $result = (bool)$document->loadXml($xmlContent, LIBXML_NONET);
+        $result = (bool)$document->loadXML($xmlContent, LIBXML_NONET);
         restore_error_handler();
         // Entity load to previous setting
         libxml_disable_entity_loader($loadEntities);
diff --git a/setup/src/Magento/Setup/Model/PhpReadinessCheck.php b/setup/src/Magento/Setup/Model/PhpReadinessCheck.php
index 3e43810ac9002..781b96975d339 100644
--- a/setup/src/Magento/Setup/Model/PhpReadinessCheck.php
+++ b/setup/src/Magento/Setup/Model/PhpReadinessCheck.php
@@ -288,7 +288,7 @@ private function checkPopulateRawPostSetting()
 
         $data = [];
         $error = false;
-        $iniSetting = intVal(ini_get('always_populate_raw_post_data'));
+        $iniSetting = intval(ini_get('always_populate_raw_post_data'));
 
         $checkVersionConstraint = $this->versionParser->parseConstraints('~5.6.0');
         $normalizedPhpVersion = $this->getNormalizedCurrentPhpVersion(PHP_VERSION);
@@ -304,7 +304,7 @@ private function checkPopulateRawPostSetting()
 	        Please open your php.ini file and set always_populate_raw_post_data to -1.
  	        If you need more help please call your hosting provider.',
             PHP_VERSION,
-            intVal(ini_get('always_populate_raw_post_data'))
+            intval(ini_get('always_populate_raw_post_data'))
         );
 
         $data['always_populate_raw_post_data'] = [