- var_dump: documentation ( source)
- filter_var: documentation ( source)
<?php
$value = false;
$v = filter_var($value, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE);
if ($v === null)
{
var_dump($value);
echo 'wat?!';
}
else
{
echo 'True is a boolean, nice to know';
}