- unserialize: documentation ( source)
- var_export: documentation ( source)
<?php
$x = 'a:2:{i:0;O:9:"exception":1:{s:17:"'."\0".'Exception'."\0".'string";O:9:"exception":1:{s:17:"'."\0".'Exception'."\0".'string";r:2;}}i:1;a:2:{i:0;R:3;i:1;R:4;}}';
$x = unserialize($x);
var_export($x, true);