function keyED($txt,$encrypt_key) //定义一个keyED

{

    $encrypt_key =    md5($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;

}

// 加密url参数

function encrypt_url($url,$key)

{

    return rawurlencode(base64_encode(encrypt($url,$key)));

}

// 解密url参数

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;

}

$key = 'key';

//生产加密参数地址

for ($i=0;$i<10;$i++)

{

    echo "<a href=./url.php?url=".encrypt_url("id=$i&act=123456&time=".time(),$key).">php技术文章$i</a><br>";

}

//获取参数地址

$get = geturl($_GET['url'],$key);

var_dump($get);