- strstr: documentation ( source)
- parse_url: documentation ( source)
<?php
$url = 'https://docs.google.com/presentation/d/1aa_xpsyJtslFJsg4UndsjDvlCe7Vu97_i6Q8zSKofy4/edit?usp=sharing';
$components = parse_url($url);
echo $components['scheme'], '://', $components['host'], strstr($components['path'],'/edit',true);