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@ 2014-05-05T12:17:23Z

<?php

function filter($value) {
    return filter_var($value, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE);
}
var_dump(filter('0'));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
filter_var: documentation ( source)

preferences:dark modelive preview

36.16 ms | 402 KiB | 5 Q