- var_dump: documentation ( source)
<?php
var_dump( (int)(bool) 23,
(int)(bool) "23",
(int)(bool) -23,
(int) true);
// 1,1,1,1
var_dump( (int)(bool) 0,
(int)(bool) "",
(int)(bool) "0",
(int) false);
// 0,0,0,0