Fixing db_persistent_connection notice

main/inc/global.inc.php

@@ -115,13 +115,16 @@ if (empty($_configuration['statistics_database']) && $already_installed) {
 global $database_connection;
 // Connect to the server database and select the main chamilo database.
 // When $_configuration['db_persistent_connection'] is set, it is expected to be a boolean type.
+$dbPersistConnection = api_get_configuration_value('db_persistent_connection');
+
 $params = array(
-    'server'        => $_configuration['db_host'],
-    'username'      => $_configuration['db_user'],
-    'password'      => $_configuration['db_password'],
-    'persistent'    => $_configuration['db_persistent_connection']
+    'server' => $_configuration['db_host'],
+    'username' => $_configuration['db_user'],
+    'password' => $_configuration['db_password'],
+    'persistent' => $dbPersistConnection
 );
-// $_configuration['db_client_flags'] can be set in configuration.php to pass 
+
+// $_configuration['db_client_flags'] can be set in configuration.php to pass
 // flags to the DB connection
 if (isset($_configuration['db_client_flags']) && !empty($_configuration['db_client_flags'])) {
     $params['client_flags'] = $_configuration['db_client_flags'];