<?php
///CONNEXION DB
$server = "*.*.*.*";
$login = "mylogin";
$pwd = "mypwd";
$base = "myschema";
$mysqli = new mysqli($server, $login, $pwd, $base) or die ();

///EXECUTION TEST
$post_data = array(
    'item' => array(
        'item_type_id' => 'idtest',
        'string_key' => 'stringtest',
    )
);
echo json_encode($post_data);
?>

function getOutput() {
        $.ajax({
            url:'myfile.php',
            dataType:'json',
            success: function(data){
                console.log(data);
            }
        });
    }