- var_dump: documentation ( source)
- pow: documentation ( source)
<?php
var_dump((int) "9999999999999999999999999999");
var_dump(9999999999999999999999999999 > pow(10, 27));
var_dump(9999999999999999999999999999 === pow(10, 27));
var_dump("9999999999999999999999999999" < pow(10, 27));
var_dump("9999999999999999999999999999" > pow(10, 27));
var_dump("9999999999999999999999999999" === pow(10, 27));