谁能帮忙解密一个文件内容么？谢谢啦
文件名为：Service.php
找了很多方法都没有解密成功，特到此来求援。谢谢

<?php /* WARNING: This file is protected by copyright law. To reverse engineer or decode this file is strictly prohibited. */
$o="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";eval(base64_decode("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"));return;?>

[解决办法]

<?php
session_start();
//error_reporting(0);
include "Include/Global.php";
$Act=$_GET['Act'];
function iconv_($str){return iconv("UTF-8","GBK",$str);}
switch($Act){
case "Login":
$Name=iconv_($db->fhtml(trim($_POST['Name'])));
$PassWord=iconv_($db->fhtml($_POST['PassWord']));
$RoomId=iconv_($db->fhtml($_POST['RoomId']));
$UserSex=$_POST['UserSex']=='true'?'0':'1';
Login($Name,$PassWord,$UserSex,$RoomId);
break;
case "ListOnLineUser":
ListOnLineUser($db->fhtml($_GET['RoomId']));
break;
case "KeepLine":
$ChatId=$db->fhtml($_GET['ChatId']);
$UsersOrder=$db->fhtml($_GET['UsersOrder']);
KeepLine($ChatId,$UsersOrder);
break;
case "SetColor":
$ChatId=$db->fhtml($_GET['ChatId']);
$Color=$db->fhtml($_GET['Color']);
SetColor($ChatId,$Color);
break;
case "GetColor":
$ChatId=$db->fhtml($_GET['ChatId']);
GetColor($ChatId);
break;
case "SendMSG":
$MsgId=$db->fhtml($_POST['MsgId']);
$FontWeight=iconv_($db->fhtml($_POST['FontWeight']));
$IsPublic=$db->fhtml($_POST['IsPublic']);
$FromChatId=$db->fhtml($_POST['FromChatId']);
$ToChatId=$db->fhtml($_POST['ToChatId']);
$ExpWord=iconv_($db->fhtml($_POST['ExpWord']));
$Content=iconv_($db->fhtml(trim($_POST['Content'])));
SendMSG($MsgId,$FontWeight,$IsPublic,$FromChatId,$ToChatId,$ExpWord,$Content);
break;
case "GetMSG":
$ChatId=$db->fhtml($_GET['ChatId']);
$MsgId=$db->fhtml($_GET['MsgId']);
GetMSG($ChatId,$MsgId);
break;
case "EditName":
$Name=$db->fhtml($_POST['Name']);
EditName(trim($Name));
break;
case "RegId":
$Name=$db->fhtml($_POST['UserName']);
$Pwd=$db->fhtml($_POST['Pwd']);
$Sex=$db->fhtml($_POST['UserSex']);
$Age=$db->fhtml($_POST['Age']);
if($db->sqlnum($db->query("select * from chat_user where UserName='$Name'"))>0)
exit("<script>alert('?????????????');</script>");
RegId($Name,$Pwd,$Sex,$Age);
exit("<script>alert('??????');</script>");
break;
case "ExitChat":
ExitChat();
break;
} 
 
?>