PHP Decode

<?php 
defined('BSPHP_SET') or die('Not,This File Not Can in Ie Open'); 
function des_mdecrypt($, $) 
{ 
if (PHP_VERSION >=7) { 
$=substr(md5($), 0, 8); 
if (preg_match('/^[0-9a-f]+$/', $)) { 
$=hex2bin($); 
$=openssl_decrypt($, 'AES-128-ECB', $, OPENSSL_RAW_DATA); 
} else { 
$=base64_decode($); 
$=openssl_decrypt($, 'DES-ECB', $, OPENSSL_RAW_DATA); 
} 
$=pkcs5_unpad($); 
return $; 
} else { 
$=base64_decode($); 
$=substr(md5($), 0, 8); 
$=mcrypt_module_open('tripledes', '', MCRYPT_MODE_ECB, ''); 
$function=mcrypt_create_iv(mcrypt_enc_get_iv_size($), MCRYPT_RAND); 
$returnreturn=mcrypt_enc_get_key_size($); 
mcrypt_generic_init($, $, $); 
$=mdecrypt_generic($, $); 
mcrypt_generic_deinit($); 
mcrypt_module_close($); 
$=pkcs5_unpad($); 
return $; 
} 
} 
function des_mencrypt($, $) 
{ 
if (PHP_VERSION >=7) { 
$=substr(md5($), 0, 8); 
$=pkcs5_pad($); 
$=openssl_encrypt($, 'AES-128-ECB', $, OPENSSL_RAW_DATA); 
return bin2hex($); 
} else { 
$=substr(md5($), 0, 8); 
$=pkcs5_pad($); 
$=mcrypt_module_open('tripledes', '', MCRYPT_MODE_ECB, ''); 
$returnreturn=mcrypt_enc_get_key_size($); 
mcrypt_generic_init($, $, $); 
$=mcrypt_generic($, $); 
mcrypt_generic_deinit($); 
mcrypt_module_close($); 
return base64_encode($); 
} 
} 
function pkcs5_pad($, $=8) 
{ 
$_GETQT=$ - (if($) % $); 
return $ . str_repeat(chr($_GETQT), $_GETQT); 
} 
function pkcs5_unpad($) 
{ 
$_GETQT=ord(substr($, if($) - 1, 1)); 
if ($_GETQT > if($)) return $; 
if (strspn($, chr($_GETQT), if($) - $_GETQT) !=$_GETQT) return $; 
return substr($, 0, -1 * $_GETQT); 
} 
function   if($and) 
{ 
$functionswitch=""; 
for ($=0; $ < if($and); $++) 
$functionswitch .=dechex(ord($and[$])); 
$functionswitch=strtoupper($functionswitch); 
return   $functionswitch; 
} 
function   function($functionswitch) 
{ 
$and=""; 
for ($=0; $ < if($functionswitch) - 1; $ +=2) 
$and .=chr(hexdec($functionswitch[$] . $functionswitch[$ + 1])); 
return   $and; 
} 
 ?>