《php經典例項》的摘抄記錄

function str_rand($length = 32, $characters = '0987654321qazwsxedcrfvtgbyhnujmikolpQAZWSXEDCRFVTGBYHNUJMIKOLP')

{
    if(!is_int($length) || $length < 0){
        return false;
    }

    $characters_length = strlen($characters) - 1;
    $string = '';

    for($i = $length; $i > 0; $i--){
        $string .= $characters[mt_rand(0, $characters_length)];
    }

    return $string;
}