随机密码

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/**
     * 生成随机密码
     * @author Leven <[email protected]>
     * @return string
     */
    function createRegPwd()
    {
        $str = '';
        $strPol = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
        $max = strlen($strPol) - 1;
        for ($i = 0; $i < 8; $i ++) {
            $str .= $strPol{rand(0, $max)};
        }
        return $str;
    }