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@ 2012-07-26T21:25:53Z

<?php
ini_set('display_errors', 'on');
error_reporting(-1);
function echoIsSet(&$var) {
    if(isset($var)) { echo $var; }
}

$exist = "hi";
echoIsSet($exist);
echoIsSet($notexist);

Output
Performance
VLD
References
Branches

ini_set: documentation ( source)
error_reporting: documentation ( source)

preferences:dark modelive preview

44.87 ms | 402 KiB | 5 Q