Write a PHP script to replace the first ‘the’ of the following string with ‘best’

PHP is a server scripting language, and It is a powerful tool for making interactive and dynamic Web-pages. I have used WampServer 2.2 for following example.

<?php
$str = 'Techstudy - the Debugging Solution website';
echo preg_replace('/the/', 'Best', $str, 1)."\n"; 
?>

Result:

Techstudy - Best Debugging Solution website