Как я отлаживаю эти ошибки в своей системе . Я не

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Fatal error: Class 'mysql' not found in C:\xampp\htdocs\LeaveManager\connection.php on line 36

Что я уже пробовал:

<?php
/**
 * APPLICATION NAME: Leave Manager
 * GROUP: Group One
 * This is the main connector to the database. Without it, there won't be any
 * connection and some things will stop working/rendering
 */

/*
 * The name of the database that holds all our tabular data.
 */
define('DB_NAME', 'leave_manager');

/*
 * The username of the databse. Needed in addition to password for connection
 */
define("DB_USER", "groupone");

/*
 * Database password. Needed for connection to database(if set)
 */
define("DB_PASS", "12345678");

/*
 * Database host. This is localhost since we're developing locally
 */
define("DB_HOST", "localhost");

/*
 * The main connection to the database is actually here.
 */

/*
 * @var $db_con will hold details to our connection
 */
$db_con = new mysql(DB_HOST, DB_USER, DB_PASS, DB_NAME);

/*
 * Character set to use for our connection. We'll choose utf-8 since it covers
 * more characters than ASCII.
 */
$db_con->set_charset("utf8");
?>

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