php - XAMPP won't connect to my database -

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i want test codes using xampp keep getting no database selected though right, ideas why won't connect database? have encountered warning on several occasions want test of codes using xampp. warning: deprecated: mysql extension deprecated , removed in future: use mysqli or pdo instead

<?php //this works mysql_connect("localhost", "root", "") or die(mysql_error()); mysql_select_db("testdb") or die(mysql_error()); ?>   <?php  $con=mysqli_connect("localhost","root","","testdb");  if (!$con) { die("connection error: " . mysqli_connect_error()); } ?>

returns this: no database selected


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