- var_dump: documentation ( source)
- parse_str: documentation ( source)
<?php
$source =parse_str('access_token=CAAEEhYSUZAa8BAJj3yVCNkFZAsyx69oFsNcUCZAgk6nZC42PyrA47Mu73yetOxWcJiJEt6Twzrz88j21eZC2NzFJfFVXHGpyxWgmxc1hrRkrlZB4mwplubGTKoR2tvgsfHJ1wTd61GDrCZAiBs1baCGc0qm7By1n59GeCeyQOojWlCXkIpO91q8n5GRXHezWawZD&expires=5182808', $output);
var_dump($output['access_token']);