HTML / PHP删除部分html输入

Question

I'm trying to embed Gists from Github that are submitted by users and I am struggling to strip out the portions that I don't need or won't store in my database.

The input looks like:

<script src="https://gist.github.com/user/513968a108093aaad5d8.js">
</script> 

And the portion that I need is the user/513968a108093aaad5d8.js part.

The site uses HTML, PHP, and JavaScript/JQuery

Answer 1

<?php
$val = '<script src="https://gist.github.com/user/513968a108093aaad5d8.js">';
echo substr($val, 37, -2);
?>

Removing the first 37 letters (<script src="https://gist.github.com/), and then remove the last 2 (">).