<?php
$host = "localhost";
$dbname = "ajax_test";
$user = "root";
$pass = "";
$db = new PDO("mysql:host=$host;dbname=$dbname", $user, $pass);
if ($db) {
    echo "all is ok";
}
$query_result = $db->query('SELECT cc_desks.* '
        . 'FROM cc_desks'
        . 'LEFT JOIN cc_callcenters'
        . 'ON cc_desks.id_callcenter = cc_callcenters.id'
        . 'WHERE cc_callcenters.id = ' . 1);
var_dump($query_result);
if ($query_result) {
    foreach ($query_result->fetchAll() as $row_number => $row) {
        $results[] = $row['name'];
    }

    $db = NULL;
    echo json_encode($results);
} else {
    echo "U LOSE";
}