Could not find driver

My code:

define(‘MYSQL_HOST’,‘global-db’);
define(‘MYSQL_USER’,‘user_name’);
define(‘MYSQL_PASSWORD’,‘user_password’);
define(‘MYSQL_DB_NAME’,‘db_name’);
try{
$PDO = new PDO(‘mysql:host=’.MYSQL_HOST.’;dbname=’.MYSQL_DB_NAME, MYSQL_USER,MYSQL_PASSWORD);
}catch(PDOException $e){
echo 'error: '.$e->getMessage();
foreach(PDO::getAvailableDrivers() as $driver) {
echo "
Divrer: ".$driver;
}
}

Return:
error: could not find driver
Divrer: sqlite

Anyone with this problem?
On my local server the mysql driver is enabled.
If I need to enable the mysql driver, how do I do it?

Thanks

Is there a text mistake in the code: Divrer: ".$driver;

the error that is occurring is not connecting to mysql via pdo.