php - mcrypt not decrypting to same length -

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I am trying to mcrypt some data using a class (methods below) such that you If you copy the data using the pack, you can use the unpack to retrieve the data. 

  $ packed = $ server- & gt; Cash-> Pack ("pack", array (123,123,123), "password"); If (! $ Packed) {resonance "data could not be encrypted \ n"; } $ Server- & gt; Cash-> Unpack ("packed", "password");   
 When I pack it, do i  var_dump  on  json_encode ()  data and get it: 
 < Code> string (13) "[123,123,123]"   
 When I open it, then I enter  var_dump  on  mcrypt_decode ()  string I get it, and get it: 
  string (32) "[123,123,123]"   
 Why length is different? When I do the  mcrypt_decode ()  string on  json_decode () , I get back to  null , and this is the reason I trim data I work, so it works, but I should not trim it.  
 Here are the ways:  
  & lt ;? Put Php public function ($ key, $ value, $ life = 0) {$ this-> Cache [$ of] = $ value; $ Life = (en) $ life; If ($ life> 0) {$ life = strtotime ("now + $ life seconds"); } $ This- & gt; Life [$ key] = $ life; } Get public function ($ key) {return $ this- & gt; Cash [$ Key]; } Public function pack ($ key, $ value, $ secret, $ life = 0) {if (function_exists ("mcrypt_encrypt")) {$ this- & gt; Put ($ key, $ value, $ life); return false; } $ Iv_size = mcrypt_get_iv_size (MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB); $ Iv = mcrypt_create_iv ($ iv_size, MCRYPT_RAND); $ Value = json_encode ($ value); Var_dump ($ value); $ Cryptdata = mcrypt_encrypt (MCRYPT_RIJNDAEL_256, $ secret, $ value, MCRYPT_MODE_ECB, $ iv); $ This- & gt; Put ($ key, $ cryptdata, $ life); Back true; } Public function unpack ($ key, $ secret) {if (! Function_exists ("mcrypt_decrypt")) {return json_decode ($ this- & gt; get ($ key) is true); } $ Cryptdata = $ this- & gt; Get ($ key); $ Iv_size = mcrypt_get_iv_size (MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB); $ Iv = mcrypt_create_iv ($ iv_size, MCRYPT_RAND); $ Data = mcrypt_decrypt (MCRYPT_RIJNDAEL_256, $ secret, $ cryptdata, MCRYPT_MODE_ECB, $ iv); // $ data = json_decode ($ data, true); Var_dump ($ data); }    
 
 
 When using block cipher mode like ECB (you should not use it A BTW), encrypted NUL-pad data, so that its length is useful in block size of the encryption algorithm.  
 If you need to know, the size of block for resident-256 is 256 bits or 32 bytes.  
 Keeping in mind that you are encrypting JSON data, you just do not  rtrim ()  data and do not worry about it unless there is any way around it You do not switch over to counter mode like CTR.

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