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@ 2014-06-15T04:05:25Z

<?php
$formval = "0";

if (isset($formval)) {
    echo "is set\n";
} 
$defined = null;
var_dump(is_null($defined));
var_dump(is_null($undefined));

Output
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var_dump: documentation ( source)

preferences:dark modelive preview

37.67 ms | 402 KiB | 5 Q