randomic string generator

strRand.php

<?php
function strRand($qtd)
{
    $chars = implode(array_merge(range(0, 9),range('A', 'Z'),range('a', 'z')));
    return substr(str_shuffle($chars), 0, $qtd);
}

$str = strRand(5);
echo "look: " . $str;