- var_dump: documentation ( source)
- base_convert: documentation ( source)
- decbin: documentation ( source)
<?php
$a = 0x40;
var_dump(base_convert($a, 10, 2)); // string(7) "1000000"
var_dump(base_convert(40, 16, 2)); // string(7) "1000000"
var_dump(decbin($a)); // string(7) "1000000"