Cannot connect to sqlserver

I got this error :

CakePHP is NOT able to connect to the database.

Database connection "Sqlserver" is missing, or could not be created.

Details :

• CakePHP 2.5.4
• Wamp server 32-bit
• Dreamweaver CS6

On my details.php

class DATABASE_CONFIG {    public $default = array(      'datasource' => 'Database/Sqlserver',      'persistent' => false,      'host' => 'localhost\MSSQLSERVER',      'database' => 'testing'  );

I have load both the extension on ext folder (apache & php) and on php.ini

extension=php_sqlsrv_55_ts.dll  extension=php_pdo_sqlsrv_55_ts.dll

Searched everywhere but still cannot connect to sqlserver.

note : I can connect to MySQL but not SQLServer

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