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@ 2015-10-21T12:39:01Z

<?php

function a($b)
{
    if($b===NULL)  echo '$b is NULL<br/>';
    if($b!==NULL)  echo '$b isnt NULL<br/>';
    var_dump($b);
}

a();

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

43.37 ms | 402 KiB | 5 Q