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@ 2015-11-12T13:58:47Z

<?php

function isValidDate(\DateTime &$dateTime = null)
{
    $dateTime = new \DateTime('today');
}

isValidDate($bla);

var_dump($bla);

Output
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var_dump: documentation ( source)

preferences:dark modelive preview

38.24 ms | 402 KiB | 5 Q