mysql_connect在XAMPP中不起作用

mysql_connect not working in XAMPP but mysqli_connect working fine

What is the problem? I am using below code:

$con = mysql_connect("localhost","root","");
mysql_select_db("tested",$con);

While following code is working fine.

$con = mysqli_connect("localhost","root","");
mysqli_select_db("tested",$con);

mysql extension was deprecated in PHP 5.5.0, and it was removed in PHP 7.0.0. Instead, the MySQLi or PDO_MySQL extension should be used.