Return a regular PDO object if a persistent connection is requested.

Doctrine DBAL currently does not work with persistent connections.
doctrine/dbal#2315

src/Illuminate/Database/Connectors/Connector.php

@@ -105,14 +105,29 @@ protected function tryAgainIfCausedByLostConnection(Exception $e, $dsn, $usernam
         throw $e;
     }
 
+    /**
+     * Determine if the connection is persistent or not.
+     *
+     * @param  array  $options
+     * @return bool
+     */
+    protected function isPersistentConnection($options)
+    {
+        if (isset($options[PDO::ATTR_PERSISTENT]) && $options[PDO::ATTR_PERISISTENT]) {
+            return true;
+        }
+
+        return false;
+    }
+
     /**
      * Create a new PDO connection instance.
      *
      * @return \PDO
      */
     protected function createPdoConnection($dsn, $username, $password, $options)
     {
-        if (class_exists(PDOConnection::class)) {
+        if (class_exists(PDOConnection::class) && ! $this->isPersistentConnection($options)) {
             return new PDOConnection($dsn, $username, $password, $options);
         }