Fatal error: Class 'PDO' not found in /home/itstec2/public_html/pard_config/class/Config.php on line 13

<?php

$dbhost=null;
$dbname=null;
$dbuser=null;
$dbpass=null;

$file = __DIR__ ."/config.json";

$array = file_get_contents($file);
$dbConfig=json_decode($array);

$pardConfig=new PDO('mysql:host='.$dbConfig[0].';'.'dbname='.$dbConfig[1],$dbConfig[2],$dbConfig[3]);

?>