- var_dump: documentation ( source)
- unserialize: documentation ( source)
<?php
$x = 'a:2:{i:0;O:9:"exception":2:{s:16:"'."\0".'Exception'."\0".'trace";s:4:"test";s:17:"'."\0".'Exception'."\0".'string";R:2;}i:1;R:2;}';
$x = unserialize($x);
var_dump($x);