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@ 2015-11-03T10:07:49Z

<?php
$foo = function (integer $bar = null ) {
    var_dump($bar);
};

$foo();
$foo(null);
$foo(100);
$foo('100');
$foo([100]);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)

preferences:dark modelive preview

52.74 ms | 402 KiB | 5 Q