- var_dump: documentation ( source)
<?php
var_dump('1000000000000000000000000000' > '1000000000000000000000000000');
var_dump('1000000000000000000000000000' < '1000000000000000000000000000');
var_dump('1000000000000000000000000000' >= '1000000000000000000000000000');