Randon string generator by PHP

generate-random-string.php

<?php

/**
 * Generates random string
 * @param int $length
 * @param string $charSet
 * @return string
 */
function generateRandomString($length = 10, $charSet = '')
{
    $str = '';

    if (empty($charSet)) {
        // A-Z0-9
        $charSet = implode('', array_merge(range('A', 'Z'), range(0, 9)));
    }

    $charSetLen = strlen($charSet);
    for ($i = 1; $i <= $length; $i++) {
        $rndCharIndex = rand(0, $charSetLen - 1);
        $str .= substr($charSet, $rndCharIndex, 1);
    }

    return $str;
}

?>