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@ 2015-08-13T16:06:24Z

<?php

class A
{
    public function fn(A $obj=null)
    {
        var_dump($obj);
    }
}

$a = new A;
$a->fn($a);
$a->fn(null);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)

preferences:dark modelive preview

25.33 ms | 404 KiB | 5 Q