NetworkError: 500 Internal Server Error

Question

When I try to execute this file, it show me black page..

i start the firebug it shows me that NetworkError: 500 Internal Server Error i tried to solve but cant find any problem here..

so could you help me to find what is the error or problem..??

class DesEncryptor
{
protected $_key;
protected $_iv;
protected $_blocksize = 8;
protected $_encrypt;
protected $_cipher;

/**
 * Creates a symmetric Data Encryption Standard (DES) encryptor object
 * with the specified key and initialization vector.
 *
 * @param $key
 * @param $iv
 * @param bool $encrypt
 */
public function __construct($key, $iv, $encrypt = true)
{
    $this->_key = $key;
    $this->_iv = $iv;
    $this->_encrypt = $encrypt;

    $this->_cipher = mcrypt_module_open(MCRYPT_DES, '', MCRYPT_MODE_CBC, '');
    mcrypt_generic_init($this->_cipher, $this->_key, $this->_iv);
}

public function __destruct()
{
    mcrypt_generic_deinit($this->_cipher);
    mcrypt_module_close($this->_cipher);
}

/**
 * Transforms the specified region of the specified byte array using PCKS7 padding.
 * @param $text
 * @return string
 */
public function transformFinalBlock($text)
{
    if ($this->_encrypt)
    {
        $padding = $this->_blocksize - strlen($text) % $this->_blocksize;
        $text .= str_repeat(pack('C', $padding), $padding);
    }

    $text = $this->transformBlock($text);

    if (!$this->_encrypt)
    {
        $padding = array_values(unpack('C', substr($text, -1)))[0];
        $text = substr($text, 0, strlen($text) - $padding);
    }

    return $text;
}

/**
 * Transforms the specified region of the specified byte array.
 * @param $text
 * @return string
 */
public function transformBlock($text)
{
    if ($this->_encrypt)
    {
        return mcrypt_generic($this->_cipher, $text);
    }
    else
    {
        return mdecrypt_generic($this->_cipher, $text);
    }
}
}

When i debug with var_dump(), i found that in function transformFinalBlock

$padding = array_values(unpack('C', substr($text, -1)))[0];

it throw me error like " '[' is unexpected "

Guys, solutions plz...

How do you use this class? A class definition does not do anything by itself! — Mohsenme, Feb 26 '14 at 11:12
@ShivanRaptor it shows nothing in mozilla, but in IE error shown like syntax error, unexpected '[' in line ----- $padding = array_values(unpack('C', substr($text, -1)))[0]; — Sanjay, Feb 26 '14 at 11:31
@Mohsenme i include this file in my index.php file & use the function of this file.. — Sanjay, Feb 26 '14 at 11:32
Can you run other scripts? Do you have .htaccess file (server configuration file) in your directory? — Mohsenme, Feb 26 '14 at 20:54
@user3181866 learn PHP please. show error by adding `ini_set('display_errors', '1');` in the first line as well as reading this: http://stackoverflow.com/questions/11749043/php-not-displaying-errors-internal-server-error-500 — Raptor, Feb 27 '14 at 02:17
@ShivanRaptor i said i already did that what you said me, i told also that it not displayed in mozilla but in IE it show me error & what error i got that i also wrote here.. Look at that... — Sanjay, Feb 27 '14 at 06:15
@Mohsenme nothing that i use.. i just want to run my index file & want to use the function of this.. nothing more.. & what error i got that i also described here.. — Sanjay, Feb 27 '14 at 06:17
i got the error in following line $padding = array_values(unpack('C', substr($text, -1)))[0]; may be i have to write like $padding = array_values(unpack('C', substr($text, -1))); $padding = $padding[0]; — Sanjay, Feb 27 '14 at 06:18
What is the exact error you got ? click the magic **edit** button & update your question please. — Raptor, Feb 27 '14 at 06:38
It's a shorthand array syntax, your php version should be >= `5.4.0`, to get it work. — Rikesh, Feb 27 '14 at 06:51

score 1 · Accepted Answer · answered Feb 27 '14 at 06:51

Array de-referencing, which is what you are doing with the line $padding = array_values(unpack('C', substr($text, -1)))[0];, is only possible as of php 5.4, any prior versions, you will have to do the following to access your array:

$arr = array_values(unpack('C', substr($text, -1)));
$padding = $arr[0];

NetworkError: 500 Internal Server Error

1 Answers1