谁能把这端PHP代码解密下？

<?php // 完美童话
$OOO0O0O00=__FILE__;$OOO000000=urldecode('%74%68%36%73%62%65%68%71%6c%61%34%63%6f%5f%73%61%64%66%70%6e%72');$OO00O0000=1512;$OOO0000O0=$OOO000000{4}.$OOO000000{9}.$OOO000000{3}.$OOO000000{5};$OOO0000O0.=$OOO000000{2}.$OOO000000{10}.$OOO000000{13}.$OOO000000{16};$OOO0000O0.=$OOO0000O0{3}.$OOO000000{11}.$OOO000000{12}.$OOO0000O0{7}.$OOO000000{5};$O0O0000O0='OOO0000O0';eval(($$O0O0000O0('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')));return;?>
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

答案：首先声明：供学习用，用于商业活动引起的易做图概不负责

程序经过一堆加密，最终要运行的东西如下：

while(time()>1260489600)die('验证程序到期');
while(((isset($HTTP_SERVER_VARS['SERVER_ADDR']))&&(!eregi('(^127\.0\.0\.1$)',$HTTP_SERVER_VARS['SERVER_ADDR'])))||((isset($_SERVER['SERVER_ADDR']))&&(!eregi('(^127\.0\.0\.1$)',$_SERVER['SERVER_ADDR']))))die('只允许单机测试 IP 127.0.0.1');
$OO00O00O0=str_replace('__FILE__',"'".$OOO0O0O00."'",($OOO0000O0($OO0OO00O0($OO0OO000O($O000O0O00,$OO00O0000),'uxfz3MN+wJqLQa6C5ryIktR74hlOGDY9FoAd0bPsciBjHKZXETgW/nmSp182vVeU=','ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'))));fclose($O000O0O00);eval($OO00O00O0);
include_once('./common.php');
$user=($_REQUEST['user_account']);
$pass=($_REQUEST['user_password']);
$email=($_REQUEST['mail']);
$ip=($_REQUEST['ip']);
$pass2=md5($pass);
$sql="SELECT `salt` FROM `uc_members` WHERE username = '$user'";
$sql1="SELECT `salt` FROM `uc_members` WHERE email = '$email'";
$sql2="insert into uc_members(username,password,email,regip)   values('".$user."','".$pass2."','".$email."','".$ip."')";
$result=mysql_fetch_row(mysql_query($sql));
$result1=mysql_fetch_row(mysql_query($sql1));
if($user == NULL ||$pass == NULL ||$email == NULL ||$ip == NUL)
{
    echo("207");
    return;
}
function isemail($email) 
{
    return strlen($email) >8 &&preg_match("/^[-_+.[:alnum:]]+@((([[:alnum:]]|[[:alnum:]][[:alnum:]-]*[[:alnum:]])\.)+([a-z]{2,4})|(([0-9][0-9]?|[0-1]    [0-9][0-9]|[2][0-4][0-9]|[2][5][0-5])\.){3}([0-9][0-9]?|[0-1][0-9][0-9]|[2][0-4][0-9]|[2][5][0-5]))$/i",$email);
}
if(!isemail($email)) 
{
    echo "204";
    exit();
}
if($result)
{
    echo("203");
    return;
}
if($result1)
{
    echo("205");
    return;
}
if(mysql_query($sql2))
{
    echo("10");
    return;
}
else
{
    echo("207");
    return;
}