[zendframework/zendframework#2210] Remove error_get_last usage

- Removed two cases where error_get_last() was being used in Cache
  component; instead, captures the return from ErrorHandler::stop() and
  calls its getMessage() method.

Author: weierophinney

src/Pattern/CallbackCache.php

@@ -155,13 +155,13 @@ protected function generateCallbackKey($callback, array $args)
                     "Can't serialize callback: see previous exception", 0, $e
                 );
             }
-            ErrorHandler::stop();
+            $error = ErrorHandler::stop();
 
             if (!$serializedObject) {
-                $lastErr = error_get_last();
-                throw new Exception\RuntimeException(
-                    "Can't serialize callback: " . $lastErr['message']
-                );
+                throw new Exception\RuntimeException(sprintf(
+                    'Cannot serialize callback: %s',
+                    $error->getMessage()
+                ));
             }
             $callbackKey.= $serializedObject;
         }

src/Storage/Adapter/AdapterOptions.php

@@ -96,10 +96,13 @@ public function setKeyPattern($keyPattern)
             if ($keyPattern !== '') {
                 ErrorHandler::start(E_WARNING);
                 $result = preg_match($keyPattern, '');
-                ErrorHandler::stop();
+                $error = ErrorHandler::stop();
                 if ($result === false) {
-                    $err = error_get_last();
-                    throw new Exception\InvalidArgumentException("Invalid pattern '{$keyPattern}': {$err['message']}");
+                    throw new Exception\InvalidArgumentException(sprintf(
+                        'Invalid pattern "%s": %s',
+                        $keyPattern,
+                        $error->getMessage()
+                    ));
                 }
             }