url加密并计算时间

function keyED($txt,$encrypt_key){
    $encrypt_key =    md5($encrypt_key);
    $ctr=0;
    $tmp = "";
    for($i=0;$i<strlen($txt);$i++)
    {
        if ($ctr==strlen($encrypt_key))
            $ctr=0;
        $tmp.= substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1);
        $ctr++;
    }
    return $tmp;
}
function encrypt($txt,$key)   {
    $encrypt_key = md5(mt_rand(0,100));
    $ctr=0;
    $tmp = "";
    for ($i=0;$i<strlen($txt);$i++)
    {
        if ($ctr==strlen($encrypt_key))
            $ctr=0;
        $tmp.=substr($encrypt_key,$ctr,1) . (substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1));
        $ctr++;
    }
    return keyED($tmp,$key);
}

function decrypt($txt,$key){
    $txt = keyED($txt,$key);
    $tmp = "";
    for($i=0;$i<strlen($txt);$i++)
    {
        $md5 = substr($txt,$i,1);
        $i++;
        $tmp.= (substr($txt,$i,1) ^ $md5);
    }
    return $tmp;
}
function encrypt_url($url,$key){
    return rawurlencode(base64_encode(encrypt($url,$key)));
}
function decrypt_url($url,$key){
    return decrypt(base64_decode(rawurldecode($url)),$key);
}
function geturl($str,$key){
    $str = decrypt_url($str,$key);
    $url_array = explode('&',$str);
    if (is_array($url_array))
    {
        foreach ($url_array as $var)
        {
            $var_array = explode("=",$var);
            $vars[$var_array[0]]=$var_array[1];
        }
    }
    return $vars;
}

function timediff($begin_time,$end_time)
{
    $begin_time = strtotime($begin_time);
    $end_time = strtotime($end_time);
    if($begin_time < $end_time){
        $starttime = $begin_time;
        $endtime = $end_time;
    }else{
        $starttime = $end_time;
        $endtime = $begin_time;
    }

    //计算天数
    $timediff = $endtime-$starttime;
    $days = intval($timediff/86400);
    //计算小时数
    $remain = $timediff%86400;
    $hours = intval($remain/3600);
    //计算分钟数
    $remain = $remain%3600;
    $mins = intval($remain/60);
    //计算秒数
    $secs = $remain%60;
    $res = array("day" => $days,"hour" => $hours,"min" => $mins,"sec" => $secs);
    return $res;
}

$key = 'key';   //url 加密字符
$time = date('Y-m-d h:i:s',time());　　//获取时间
$url = "http://XXXXXXX/XXX/XXX.html?url=".encrypt_url("&agent_phone=&agent_level=&&time=$time",$key);
echo $url;　　//看下效果
// http://XXXXXXX/XXX/XXX.html?url=UiQDMVJnXmJabgh4VwgEIQ9tC25UYVVoXjhZL1E2VWdXYlNuUnQBBww6VzZRJwExAGYGMQF8BXsBLlduAGtVZVI%2FA2JSMF42WjgIIVdnBGAPKAswVDhVLV41WTpRbVUzVzNTOlIzAW4%3D

$time = date('Y-m-d h:i:s',time());
$decodeurl =  geturl($_GET['url'],$key);
p($decodeurl);　　//打印解密后的url
echo $time;　　　　//当前时间
$diff_time = timediff($time,$decodeurl['time']);　　//比较时间戳大小
p($diff_time);
exit;