convert short youtube url to full url in php

To convert short youtube URL to full URL, in PHP we can use preg_replace() function.

preg_replace(): It is an inbuilt function of PHP which used to search a particular content in a string and replace it with another content with the help of a regular expression.

For more details about preg_replace() function click here

Here is the code to convert a short youtube URL to a full URL.

---

<?php
$short_url = 'https://www.youtube.com/x7koOV63k4M';
$long_url= preg_replace('~^https?://www.youtube\.com/([a-z\d]+)$~i', 'http://www.youtube.com/watch?v=$1', $short_url);
echo $long_url;
?>

Output: