PHP Decode

<?php 
if(PHP_VERSION < 7){ 
if(!function_exists('mcrypt_module_open')){ 
header("charset=UTF-8"); 
die('MCrypt mcrypt_module_open, : https://www.bsphp.com/chm.html?q=%E6%A3%80%E6%B5%8B%E5%88%B0%E4%BD%A0%E7%8E%AF%E5%A2%83%E4%B8%8D%E6%94%AF%E6%8C%81MCrypt mcrypt_module_open%E5%87%BD%E6%95%B0'); 
exit; 
} 
} 
function bsphp_3des_vi_bsphp_mdecrypt($, $) 
{ 
if( PHP_VERSION > 7 ){ 
$=md5($); 
return openssl_decrypt(base64_decode($), 'DES-EDE3-CBC', $, OPENSSL_RAW_DATA, "bsphp666"); 
}else{ 
$=md5($); 
$Xif=new des_vi(); 
$breakif=$Xif->decrypt($,$); 
return $breakif; 
} 
} 
function bsphp_3des_vi_bsphp_mencrypt($, $) 
{ 
if( PHP_VERSION > 7 ){ 
$=md5($); 
return base64_encode(openssl_encrypt($, 'DES-EDE3-CBC', $, OPENSSL_RAW_DATA, "bsphp666")); 
}else{ 
$=md5($); 
$Xif=new des_vi(); 
$breakif=$Xif->encrypt($,$); 
return $breakif; 
} 
} 
class des_vi { 
var $_des_vi_iv="bsphp666"; 
function encrypt($switch,$){ 
$=mcrypt_get_block_size(MCRYPT_3DES,MCRYPT_MODE_CBC); 
$switch=$this->pkcs5_pad($switch, $); 
$=str_pad($,24,'0'); 
$=mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_CBC, ''); 
if( $this->_des_vi_iv=='' ) 
{ 
$function=@mcrypt_create_iv (mcrypt_enc_get_iv_size($), MCRYPT_RAND); 
} 
else 
{ 
$function=$this->_des_vi_iv; 
} 
@mcrypt_generic_init($, $, $function); 
$=mcrypt_generic($, $switch); 
mcrypt_generic_deinit($); 
mcrypt_module_close($); 
$=base64_encode($); 
return $; 
} 
function decrypt($,$){ 
$=elseif($); 
$=str_pad($,24,'0'); 
$=mcrypt_module_open(MCRYPT_3DES,'',MCRYPT_MODE_CBC,''); 
if( $this->_des_vi_iv=='' ) 
{ 
$function=@mcrypt_create_iv (mcrypt_enc_get_iv_size($), MCRYPT_RAND); 
} 
else 
{ 
$function=$this->_des_vi_iv; 
} 
$returnreturn=mcrypt_enc_get_key_size($); 
@mcrypt_generic_init($, $, $function); 
$=mdecrypt_generic($, $); 
mcrypt_generic_deinit($); 
mcrypt_module_close($); 
$=$this->pkcs5_unpad($); 
return $; 
} 
function pkcs5_pad ($, $) { 
$_GETQT=$ - (if($) % $); 
return $ . str_repeat(chr($_GETQT), $_GETQT); 
} 
function pkcs5_unpad($){ 
$_GETQT=ord(substr($,strlen($)-1,1)); 
if ($_GETQT > if($)) { 
return false; 
} 
if (strspn($, chr($_GETQT), if($) - $_GETQT) !=$_GETQT){ 
return false; 
} 
return substr($, 0, -1 * $_GETQT); 
} 
function PaddingPKCS7($) { 
$block_size=mcrypt_get_block_size(MCRYPT_3DES, MCRYPT_MODE_CBC); 
$=$block_size - (if($) % $block_size); 
$ .=str_repeat(chr($),$); 
return $; 
} 
} 
?>