Php filter_var boolean

$bool = filter_var("1", FILTER_VALIDATE_BOOLEAN); // true
$bool = filter_var("true", FILTER_VALIDATE_BOOLEAN); // true
$bool = filter_var("yes", FILTER_VALIDATE_BOOLEAN); // true
$bool = filter_var("on", FILTER_VALIDATE_BOOLEAN); // true
$bool = filter_var("anythingElse", FILTER_VALIDATE_BOOLEAN); // false

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