PHP: Serialize Check

is_serialized.php

<?php 

// There's no built in function to check if data is serialized or not
// other than trying to unserialize it, and receiving an error if it isn't...

	function is_serialized($data){ 
		if(trim($data) == "") { 
			return false; 
		} 
		if(preg_match("/^(i|s|a|o|d)(.*);/si",$data)) { 
			return true; 
		} 
		return false; 
	} 

	if(is_serialized($data)) 
		$undata = unserialize($data); 
	}
?>