ponepaste/testbin/2c-ajax-tag.php

<?php
// INIT
require __DIR__ . DIRECTORY_SEPARATOR . "lib" . DIRECTORY_SEPARATOR . "2a-config.php";
require PATH_LIB . "2b-lib-tag.php";
$tagDB = new Tag();

// PROCESS AJAX REQUESTS
switch ($_POST['req']) {
    // INVALID
    default:
        echo json_encode([
            "status" => 0,
            "message" => "Invalid request"
        ]);
        break;

    // GET TAGS FOR POST
    case "get":
        $tags = $tagDB->getAll($_POST['post_id']);
        echo json_encode([
            "status" => is_array($tags) ? 1 : 0,
            "message" => $tags
        ]);
        break;

    // SAVE TAGS
    case "save":
        $pass = $tagDB->reTag($_POST['post_id'], json_decode($_POST['tags']));
        echo json_encode([
            "status" => $pass ? 1 : 0,
            "message" => $pass ? "OK" : $tagDB->error
        ]);
        break;
}
?>