解密使用jsonparser从php发送的数据时出错

I'm trying to decrypt data received from Android using HTTP request (Jsonparser) in my server, lines that decrypt the data are commented below in the code. The error appears in android : Error parsing data org.json.JSONException and data is not passed to the server. And when I comment the lines the data arrives at the server normally. How can I decrypt the data before inserting them into the database?

<?php 
include("dbConnect.php");
$ID =$_POST["id"];
    $Tencrypted =$_POST["temp"];
    $Pencrypted =$_POST["pulse"];
$Mencrypted =$_POST["motion"];
//$mcrypt = new MCrypt();

//$Tdecrypted = $mcrypt->decrypt($Tencrypted);

//$Pdecrypted = $mcrypt->decrypt($Pencrypted);
//$Mdecrypted = $mcrypt->decrypt($Mencrypted);

if($ID=="1")
$query = "INSERT INTO William(Temperature,Pulse,Motion) VALUES('$Tencrypted','$Pencrypted','$Mencrypted')";
else if($ID=="2")
$query = "INSERT INTO Jack(Temperature,Pulse,Motion) VALUES('$Tencrypted','$Pencrypted','$Mdecrypted')";
else if($ID=="3")
$query = "INSERT INTO Sam(Temperature,Pulse,Motion) VALUES('$Tencrypted','$Pencrypted','$Mencrypted')";

    $result = mysql_query($query) or die(mysql_error());
$arr=array('success'=>$result);
echo json_encode($arr);
/*class MCrypt
{
    private $iv = 'fedcba9876543210'; #Same as in JAVA
private $key = '0123456789abcdef'; #Same as in JAVA

function __construct()
{
}

 * @param string $str
 * @param bool $isBinary whether to encrypt as binary or not. Default is: false
 * @return string Encrypted data

function encrypt($str, $isBinary = false)
{
    $iv = $this->iv;
    $str = $isBinary ? $str : utf8_decode($str);
    $td = mcrypt_module_open('rijndael-128', ' ', 'cbc', $iv);
    mcrypt_generic_init($td, $this->key, $iv);
    $encrypted = mcrypt_generic($td, $str);
    mcrypt_generic_deinit($td);
    mcrypt_module_close($td);
    return $isBinary ? $encrypted : bin2hex($encrypted);
}

 * @param string $code
 * @param bool $isBinary whether to decrypt as binary or not. Default is: false
 * @return string Decrypted data

function decrypt($code, $isBinary = false)
{

    $code = $this->hex2bin($code);
              $iv = $this->iv;

              $td = mcrypt_module_open('rijndael-128', '', 'cbc', $iv);

              mcrypt_generic_init($td, $this->key, $iv);
              $decrypted = mdecrypt_generic($td, $code);

              mcrypt_generic_deinit($td);
              mcrypt_module_close($td);

              return utf8_encode(trim($decrypted));
}
protected function hex2bin($hexdata)
{
    $bindata = '';
    for ($i = 0; $i < strlen($hexdata); $i += 2) {
        $bindata .= chr(hexdec(substr($hexdata, $i, 2)));
    }

    return $bindata;
}
}

*/  
?>

Thanks for your patience and time in reading the code. Please help me.