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@ 2017-07-10T11:49:36Z

<?php

class Test
{
    public function testa(array $a = NULL)
    {
        var_dump($a);
    }
}

$a = new Test();
$a->testa();

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

40.17 ms | 402 KiB | 5 Q