- var_dump: documentation ( source)
<?php
/* A new exponent operator is introduced into PHP 5.6 */
var_dump(2 ** 32); // Pre-5.6 you would need pow(2,32)
/* Power-tower is supported */
var_dump(2 ** 3 ** 4); // Pre-5.6 this would be pow(2, pow(3, 4)) but the syntax is much easier than nesting functions