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@ 2013-10-16T08:40:56Z

<?php

function initialiseStr(&$var = null)
{
    if (!isset($var)) {
        $var = '';
    }
}

initialiseStr($foo);
var_dump($foo);

Output
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var_dump: documentation ( source)

preferences:dark modelive preview

59.69 ms | 402 KiB | 5 Q