- var_dump: documentation ( source)
- hexdec: documentation ( source)
<?php
var_dump(PHP_INT_MAX);
var_dump(PHP_INT_SIZE);
var_dump(hexdec('FFFFFFF'));
var_dump(hexdec('FFFFFFFFFFFFFFF'));
var_dump(hexdec('755869c2d8ad8a0'));
var_dump(hexdec('755869c2d8ad8a0a15e4337804c3dec6'));