URL address transfer encryption and decryption function in PHP development

functionKeyED ($txt,$encrypt _key)//define a 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 $tmp; }      functionEncrypt$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)); $ctr++; }              returnKeyED ($tmp,$key); }      functionDecrypt$txt,$key)  {             $txt= KeyED ($txt,$key); $tmp= ' ';  for($i= 0;$i<strlen($txt);$i++)             {                     $MD 5=substr($txt,$i, 1); $i++; $tmp.= (substr($txt,$i, 1) ^$MD 5); }             return $tmp; }//Encrypt URL parametersfunctionEncrypt_url ($url,$key)  {      return Rawurlencode(Base64_encode(Encrypt ($url,$key))); }//Decrypting URL ParametersfunctionDecrypt_url ($url,$key)  {      returnDecryptBase64_decode(Rawurldecode($url)),$key); }  functionGeturl$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; }

Test

$key= ' key ';//production encryption parameter address for($i= 0;$i<10;$i++){    Echo"<a href=./url.php?url=". Encrypt_url ("id=$i&act=123456&time= ". Time(),$key)." >php Technical Articles$i</a><br> ";}//Get parameter Address$get= Geturl ($_get[' URL '],$key);Var_dump($get);

URL address transfer encryption and decryption function in PHP development