function pkcs5_pad ($text, $blocksize) {  //加密时的字节填充，保持和java 一致

         $pad = $blocksize - (strlen($text) % $blocksize);

         return $text . str_repeat(chr($pad), $pad);

     }

     function myCrypt($input,$key) //加密

     {

         $size = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB);

         $input =pkcs5_pad($input, $size);

         $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_ECB, '');

         $iv = mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);

         mcrypt_generic_init($td, $key, $iv);

         $data = mcrypt_generic($td, $input);

         mcrypt_generic_deinit($td);

         mcrypt_module_close($td);

         $data = base64_encode($data);

         return $data;

     }

     function myDecrypt($str,$key) //解密

     {

         $decrypted= mcrypt_decrypt(

             MCRYPT_RIJNDAEL_128,

             $key,

             base64_decode($str),

             MCRYPT_MODE_ECB

             );

         $dec_s = strlen($decrypted);

         $padding = ord($decrypted[$dec_s-1]);

         $decrypted = substr($decrypted, 0, -$padding);

         return $decrypted;

     }

define("DESKEY", "11111111111111111111111111111111");

echo myCrypt("123", DESKEY); 

echo myDecrypt("TvQqNxgkDgZj4BaqG4cKkA==",DESKEY);