php生成一个随机的字符串

/**
 * 生成一个随机的字符串
 *
 * @param int $length
 * @param boolean $special_chars
 * @return string
 */
function getRandStr($length = 12, $special_chars = true) {
    $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
    if ($special_chars) {
        $chars .= '!@#$%^&*()';
    }
    $randStr = '';
    for ($i = 0; $i < $length; $i++) {
        $randStr .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
    }
    return $randStr;
}

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