diff --git a/src/Reader/Entry/AbstractEntry.php b/src/Reader/Entry/AbstractEntry.php
index 449d7ae5..7b006875 100644
--- a/src/Reader/Entry/AbstractEntry.php
+++ b/src/Reader/Entry/AbstractEntry.php
@@ -122,8 +122,9 @@ public function getEncoding()
      */
     public function saveXml()
     {
-        $dom = new DOMDocument('1.0', $this->getEncoding());
-        $entry = $dom->importNode($this->getElement(), true);
+        $dom   = new DOMDocument('1.0', $this->getEncoding());
+        $deep  = version_compare(PHP_VERSION, '7', 'ge') ? 1 : true;
+        $entry = $dom->importNode($this->getElement(), $deep);
         $dom->appendChild($entry);
         return $dom->saveXml();
     }
@@ -202,8 +203,10 @@ public function __call($method, $args)
                 return call_user_func_array(array($extension, $method), $args);
             }
         }
-        throw new Exception\RuntimeException('Method: ' . $method
-            . ' does not exist and could not be located on a registered Extension');
+        throw new Exception\RuntimeException(sprintf(
+            'Method: %s does not exist and could not be located on a registered Extension',
+            $method
+        ));
     }
 
     /**
diff --git a/src/Reader/Extension/Atom/Entry.php b/src/Reader/Extension/Atom/Entry.php
index 68fdafcc..06e94a27 100644
--- a/src/Reader/Extension/Atom/Entry.php
+++ b/src/Reader/Extension/Atom/Entry.php
@@ -103,20 +103,21 @@ public function getContent()
                 case 'html':
                 case 'text/html':
                     $content = $el->nodeValue;
-                break;
+                    break;
                 case 'xhtml':
                     $this->getXpath()->registerNamespace('xhtml', 'http://www.w3.org/1999/xhtml');
                     $xhtml = $this->getXpath()->query(
                         $this->getXpathPrefix() . '/atom:content/xhtml:div'
                     )->item(0);
                     $d = new DOMDocument('1.0', $this->getEncoding());
-                    $xhtmls = $d->importNode($xhtml, true);
+                    $deep = version_compare(PHP_VERSION, '7', 'ge') ? 1 : true;
+                    $xhtmls = $d->importNode($xhtml, $deep);
                     $d->appendChild($xhtmls);
                     $content = $this->collectXhtml(
                         $d->saveXML(),
                         $d->lookupPrefix('http://www.w3.org/1999/xhtml')
                     );
-                break;
+                    break;
             }
         }
 
@@ -296,9 +297,12 @@ public function getBaseUrl()
             return $this->data['baseUrl'];
         }
 
-        $baseUrl = $this->getXpath()->evaluate('string('
-            . $this->getXpathPrefix() . '/@xml:base[1]'
-        . ')');
+        $baseUrl = $this->getXpath()->evaluate(
+            'string('
+            . $this->getXpathPrefix()
+            . '/@xml:base[1]'
+            . ')'
+        );
 
         if (!$baseUrl) {
             $baseUrl = $this->getXpath()->evaluate('string(//@xml:base[1])');
diff --git a/src/Writer/Renderer/Entry/Atom.php b/src/Writer/Renderer/Entry/Atom.php
index 9f3aa740..31b0a9ac 100644
--- a/src/Writer/Renderer/Entry/Atom.php
+++ b/src/Writer/Renderer/Entry/Atom.php
@@ -265,12 +265,14 @@ protected function _setId(DOMDocument $dom, DOMElement $root)
 
         if (!$this->getDataContainer()->getId()) {
             $this->getDataContainer()->setId(
-                $this->getDataContainer()->getLink());
+                $this->getDataContainer()->getLink()
+            );
         }
         if (!Uri::factory($this->getDataContainer()->getId())->isValid()
             && !preg_match(
                 "#^urn:[a-zA-Z0-9][a-zA-Z0-9\-]{1,31}:([a-zA-Z0-9\(\)\+\,\.\:\=\@\;\$\_\!\*\-]|%[0-9a-fA-F]{2})*#",
-                $this->getDataContainer()->getId())
+                $this->getDataContainer()->getId()
+            )
             && !$this->_validateTagUri($this->getDataContainer()->getId())
         ) {
             throw new Writer\Exception\InvalidArgumentException('Atom 1.0 IDs must be a valid URI/IRI');
@@ -289,7 +291,11 @@ protected function _setId(DOMDocument $dom, DOMElement $root)
      */
     protected function _validateTagUri($id)
     {
-        if (preg_match('/^tag:(?P<name>.*),(?P<date>\d{4}-?\d{0,2}-?\d{0,2}):(?P<specific>.*)(.*:)*$/', $id, $matches)) {
+        if (preg_match(
+            '/^tag:(?P<name>.*),(?P<date>\d{4}-?\d{0,2}-?\d{0,2}):(?P<specific>.*)(.*:)*$/',
+            $id,
+            $matches
+        )) {
             $dvalid = false;
             $date = $matches['date'];
             $d6 = strtotime($date);
@@ -341,7 +347,8 @@ protected function _setContent(DOMDocument $dom, DOMElement $root)
         $element = $dom->createElement('content');
         $element->setAttribute('type', 'xhtml');
         $xhtmlElement = $this->_loadXhtml($content);
-        $xhtml = $dom->importNode($xhtmlElement, true);
+        $deep = version_compare(PHP_VERSION, '7', 'ge') ? 1 : true;
+        $xhtml = $dom->importNode($xhtmlElement, $deep);
         $element->appendChild($xhtml);
         $root->appendChild($element);
     }
@@ -369,8 +376,11 @@ protected function _loadXhtml($content)
             "/(<[\/]?)([a-zA-Z]+)/"
         ), '$1xhtml:$2', $xhtml);
         $dom = new DOMDocument('1.0', $this->getEncoding());
-        $dom->loadXML('<xhtml:div xmlns:xhtml="http://www.w3.org/1999/xhtml">'
-            . $xhtml . '</xhtml:div>');
+        $dom->loadXML(
+            '<xhtml:div xmlns:xhtml="http://www.w3.org/1999/xhtml">'
+            . $xhtml
+            . '</xhtml:div>'
+        );
         return $dom->documentElement;
     }
 
diff --git a/src/Writer/Renderer/Feed/Atom.php b/src/Writer/Renderer/Feed/Atom.php
index 2b33f6a1..939babc0 100644
--- a/src/Writer/Renderer/Feed/Atom.php
+++ b/src/Writer/Renderer/Feed/Atom.php
@@ -40,7 +40,8 @@ public function render()
         $this->dom = new DOMDocument('1.0', $this->container->getEncoding());
         $this->dom->formatOutput = true;
         $root = $this->dom->createElementNS(
-            Writer\Writer::NAMESPACE_ATOM_10, 'feed'
+            Writer\Writer::NAMESPACE_ATOM_10,
+            'feed'
         );
         $this->setRootElement($root);
         $this->dom->appendChild($root);
@@ -76,7 +77,8 @@ public function render()
             } else {
                 if (!$this->dom->documentElement->hasAttribute('xmlns:at')) {
                     $this->dom->documentElement->setAttribute(
-                        'xmlns:at', 'http://purl.org/atompub/tombstones/1.0'
+                        'xmlns:at',
+                        'http://purl.org/atompub/tombstones/1.0'
                     );
                 }
                 $renderer = new Renderer\Entry\AtomDeleted($entry);
@@ -88,7 +90,8 @@ public function render()
             $renderer->setRootElement($this->dom->documentElement);
             $renderer->render();
             $element = $renderer->getElement();
-            $imported = $this->dom->importNode($element, true);
+            $deep = version_compare(PHP_VERSION, '7', 'ge') ? 1 : true;
+            $imported = $this->dom->importNode($element, $deep);
             $root->appendChild($imported);
         }
         return $this;
diff --git a/src/Writer/Renderer/Feed/Rss.php b/src/Writer/Renderer/Feed/Rss.php
index aff8ae16..be902b8a 100644
--- a/src/Writer/Renderer/Feed/Rss.php
+++ b/src/Writer/Renderer/Feed/Rss.php
@@ -85,7 +85,8 @@ public function render()
             $renderer->setRootElement($this->dom->documentElement);
             $renderer->render();
             $element = $renderer->getElement();
-            $imported = $this->dom->importNode($element, true);
+            $deep = version_compare(PHP_VERSION, '7', 'ge') ? 1 : true;
+            $imported = $this->dom->importNode($element, $deep);
             $channel->appendChild($imported);
         }
         return $this;
@@ -195,8 +196,11 @@ protected function _setDateModified(DOMDocument $dom, DOMElement $root)
     protected function _setGenerator(DOMDocument $dom, DOMElement $root)
     {
         if (!$this->getDataContainer()->getGenerator()) {
-            $this->getDataContainer()->setGenerator('Zend_Feed_Writer',
-                Version::VERSION, 'http://framework.zend.com');
+            $this->getDataContainer()->setGenerator(
+                'Zend_Feed_Writer',
+                Version::VERSION,
+                'http://framework.zend.com'
+            );
         }
 
         $gdata = $this->getDataContainer()->getGenerator();