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@ 2013-12-09T08:58:50Z

<?php
function foo (&$val=NULL) {
    var_dump($val);
}

foo();
foo($val);
foo($val = NULL);
foo($val = array());

Output
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var_dump: documentation ( source)

preferences:dark modelive preview

38.78 ms | 402 KiB | 5 Q