- var_dump: documentation ( source)
- unserialize: documentation ( source)
<?php
var_dump(unserialize('a:4:{s:11:"duplication";s:5:"Email";s:17:"extraction_fields";a:5:{i:1;s:9:"FirstName";i:2;s:8:"LastName";i:4;s:5:"Email";i:10;s:11:"__skipField";i:11;s:11:"__skipField";}s:13:"custom_fields";a:0:{}s:12:"magic_fields";a:0:{}}'));