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@ 2015-08-14T18:26:30Z

<?php

class A {
    public function test(A $dep = null){
        print_r($dep?$dep:"null");
    }
}

$a = new A();
$b = new A();
$a->dep();
$a->dep($b);

Output
Performance
VLD
References
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print_r: documentation ( source)

preferences:dark modelive preview

15.63 ms | 402 KiB | 5 Q