Kemarin tanggal 26 September 2013 ada sebuah notifikasi pesan masuk di akun facebook saya, ternyata ada seorang teman yang mengalami kesulitan dalam memasang ckfinder pada aplikasi ujian online miliknya. Masalahnya adalah setelah mengupload aplikasi tersebut ke public hosting ckfinder tersebut tidak dapat menampilkan gambar yang diupload dalam bentuk thumbnail padahal ketika aplikasi tersebut diinstall di web server local ( komputer local ) hal tersebut tidak terjadi alias lancar jaya tanpa hambatan apapun.
Screenshot dari teman saya 
Setelah saya membaca pesannya maka saya memberanikan diri untuk meminta screenshot dari aplikasi ujian online miliknya beserta dengan username dan password untuk masuk ke public hosting milik teman saya tadi ( padahal saya juga belum pernah mengalami hal tersebut pada ckfinder saya, hehehhehe …….. ) dan setelah beliau memberikannya saya segera beraksi untuk mencari tahu apa yang terjadi dengan ckfinder tersebut. Segera saja saya mencoba untuk login ke aplikasi ujian online teman saya tersebut dan mencoba ckfinder pada aplikasi tersebut, singkat cerita setelah berputar – putar melakukan percobaan akhirnya saya menemukan solusi yaitu ada pada folder ../ckfinder/core/connector/php/ didalamnya terdapat file error_log segera saja saya membukanya dan alhamdulillah ada petunjuk yang sangat jelas yaitu
[27-Sep-2013 13:39:29] PHP Warning: readfile() has been disabled for security reasons in /xxxxxxx/xxxxxx/public_html/cbt/include/ckfinder/core/connector/php/php5/CommandHandler/Thumbnail.php on line 123
[27-Sep-2013 13:39:47] PHP Warning: readfile() has been disabled for security reasons in /xxxxxxx/xxxxxx/public_html/cbt/include/ckfinder/core/connector/php/php5/CommandHandler/Thumbnail.php on line 123
Maka setelah penyebabnya ditemukan saya mencari solusinya dan sampailah saya pada alamat dan segera saja saya mengedit file /xxxxxxx/xxxxxx/public_html/cbt/include/ckfinder/core/connector/php/php5/CommandHandler/Thumbnail.php dengan text editor kesayangan saya geany, berikut ini hasil editan saya
<?php
/*
* CKFinder
* ========
* http://ckfinder.com
* Copyright (C) 2007-2011, CKSource - Frederico Knabben. All rights reserved.
*
* The software, this file and its contents are subject to the CKFinder
* License. Please read the license.txt file before using, installing, copying,
* modifying or distribute this file or part of its contents. The contents of
* this file is part of the Source Code of CKFinder.
*/
if (!defined('IN_CKFINDER')) exit;
/**
* @package CKFinder
* @subpackage CommandHandlers
* @copyright CKSource - Frederico Knabben
*/
/**
* Handle Thumbnail command (create thumbnail if doesn't exist)
*
* @package CKFinder
* @subpackage CommandHandlers
* @copyright CKSource - Frederico Knabben
*/
class CKFinder_Connector_CommandHandler_Thumbnail extends CKFinder_Connector_CommandHandler_CommandHandlerBase
{
/**
* Command name
*
* @access private
* @var string
*/
private $command = "Thumbnail";
/**
* handle request and send response
* @access public
*
*/
public function sendResponse()
{
// Get rid of BOM markers
if (ob_get_level()) {
while (@ob_end_clean() && ob_get_level());
}
header("Content-Encoding: none");
$this->checkConnector();
$this->checkRequest();
$_config =& CKFinder_Connector_Core_Factory::getInstance("Core_Config");
$_thumbnails = $_config->getThumbnailsConfig();
if (!$_thumbnails->getIsEnabled()) {
$this->_errorHandler->throwError(CKFINDER_CONNECTOR_ERROR_THUMBNAILS_DISABLED);
}
if (!$this->_currentFolder->checkAcl(CKFINDER_CONNECTOR_ACL_FILE_VIEW)) {
$this->_errorHandler->throwError(CKFINDER_CONNECTOR_ERROR_UNAUTHORIZED);
}
if (!isset($_GET["FileName"])) {
$this->_errorHandler->throwError(CKFINDER_CONNECTOR_ERROR_INVALID_REQUEST);
}
$fileName = CKFinder_Connector_Utils_FileSystem::convertToFilesystemEncoding($_GET["FileName"]);
$_resourceTypeInfo = $this->_currentFolder->getResourceTypeConfig();
if (!CKFinder_Connector_Utils_FileSystem::checkFileName($fileName)) {
$this->_errorHandler->throwError(CKFINDER_CONNECTOR_ERROR_INVALID_REQUEST);
}
$sourceFilePath = CKFinder_Connector_Utils_FileSystem::combinePaths($this->_currentFolder->getServerPath(), $fileName);
if ($_resourceTypeInfo->checkIsHiddenFile($fileName) || !file_exists($sourceFilePath)) {
$this->_errorHandler->throwError(CKFINDER_CONNECTOR_ERROR_FILE_NOT_FOUND);
}
$thumbFilePath = CKFinder_Connector_Utils_FileSystem::combinePaths($this->_currentFolder->getThumbsServerPath(), $fileName);
// If the thumbnail file doesn't exists, create it now.
if (!file_exists($thumbFilePath)) {
if(!$this->createThumb($sourceFilePath, $thumbFilePath, $_thumbnails->getMaxWidth(), $_thumbnails->getMaxHeight(), $_thumbnails->getQuality(), true, $_thumbnails->getBmpSupported())) {
$this->_errorHandler->throwError(CKFINDER_CONNECTOR_ERROR_ACCESS_DENIED);
}
}
$size = filesize($thumbFilePath);
$sourceImageAttr = getimagesize($thumbFilePath);
$mime = $sourceImageAttr["mime"];
$rtime = isset($_SERVER["HTTP_IF_MODIFIED_SINCE"])?@strtotime($_SERVER["HTTP_IF_MODIFIED_SINCE"]):0;
$mtime = filemtime($thumbFilePath);
$etag = dechex($mtime) . "-" . dechex($size);
$is304 = false;
if (isset($_SERVER["HTTP_IF_NONE_MATCH"]) && $_SERVER["HTTP_IF_NONE_MATCH"] === $etag) {
$is304 = true;
}
else if($rtime == $mtime) {
$is304 = true;
}
if ($is304) {
header("HTTP/1.0 304 Not Modified");
exit();
}
//header("Cache-Control: cache, must-revalidate");
//header("Pragma: public");
//header("Expires: 0");
header('Cache-control: public');
header('Etag: ' . $etag);
header("Content-type: " . $mime . "; name=\"" . CKFinder_Connector_Utils_Misc::mbBasename($thumbFilePath) . "\"");
header("Last-Modified: ".gmdate('D, d M Y H:i:s', $mtime) . " GMT");
//header("Content-type: application/octet-stream; name=\"{$file}\"");
//header("Content-Disposition: attachment; filename=\"{$file}\"");
header("Content-Length: ".$size);
//readfile($thumbFilePath);
$file = fopen($thumbFilePath, 'rb');
if ( $file !== false ) {
while ( !feof($file) ) {
echo fread($file, 4096);
}
fclose($file);
}
exit;
}
/**
* Create thumbnail
*
* @param string $sourceFile
* @param string $targetFile
* @param int $maxWidth
* @param int $maxHeight
* @param boolean $preserverAspectRatio
* @param boolean $bmpSupported
* @return boolean
* @static
* @access public
*/
public static function createThumb($sourceFile, $targetFile, $maxWidth, $maxHeight, $quality, $preserverAspectRatio, $bmpSupported = false)
{
$sourceImageAttr = @getimagesize($sourceFile);
if ($sourceImageAttr === false) {
return false;
}
$sourceImageWidth = isset($sourceImageAttr[0]) ? $sourceImageAttr[0] : 0;
$sourceImageHeight = isset($sourceImageAttr[1]) ? $sourceImageAttr[1] : 0;
$sourceImageMime = isset($sourceImageAttr["mime"]) ? $sourceImageAttr["mime"] : "";
$sourceImageBits = isset($sourceImageAttr["bits"]) ? $sourceImageAttr["bits"] : 8;
$sourceImageChannels = isset($sourceImageAttr["channels"]) ? $sourceImageAttr["channels"] : 3;
if (!$sourceImageWidth || !$sourceImageHeight || !$sourceImageMime) {
return false;
}
$iFinalWidth = $maxWidth == 0 ? $sourceImageWidth : $maxWidth;
$iFinalHeight = $maxHeight == 0 ? $sourceImageHeight : $maxHeight;
if ($sourceImageWidth <= $iFinalWidth && $sourceImageHeight <= $iFinalHeight) {
if ($sourceFile != $targetFile) {
copy($sourceFile, $targetFile);
}
return true;
}
if ($preserverAspectRatio)
{
// Gets the best size for aspect ratio resampling
$oSize = CKFinder_Connector_CommandHandler_Thumbnail::GetAspectRatioSize($iFinalWidth, $iFinalHeight, $sourceImageWidth, $sourceImageHeight );
}
else {
$oSize = array('Width' => $iFinalWidth, 'Height' => $iFinalHeight);
}
CKFinder_Connector_Utils_Misc::setMemoryForImage($sourceImageWidth, $sourceImageHeight, $sourceImageBits, $sourceImageChannels);
switch ($sourceImageAttr['mime'])
{
case 'image/gif':
{
if (@imagetypes() & IMG_GIF) {
$oImage = @imagecreatefromgif($sourceFile);
} else {
$ermsg = 'GIF images are not supported';
}
}
break;
case 'image/jpeg':
{
if (@imagetypes() & IMG_JPG) {
$oImage = @imagecreatefromjpeg($sourceFile) ;
} else {
$ermsg = 'JPEG images are not supported';
}
}
break;
case 'image/png':
{
if (@imagetypes() & IMG_PNG) {
$oImage = @imagecreatefrompng($sourceFile) ;
} else {
$ermsg = 'PNG images are not supported';
}
}
break;
case 'image/wbmp':
{
if (@imagetypes() & IMG_WBMP) {
$oImage = @imagecreatefromwbmp($sourceFile);
} else {
$ermsg = 'WBMP images are not supported';
}
}
break;
case 'image/bmp':
{
/*
* This is sad that PHP doesn't support bitmaps.
* Anyway, we will use our custom function at least to display thumbnails.
* We'll not resize images this way (if $sourceFile === $targetFile),
* because user defined imagecreatefrombmp and imagecreatebmp are horribly slow
*/
if ($bmpSupported && (@imagetypes() & IMG_JPG) && $sourceFile != $targetFile) {
$oImage = CKFinder_Connector_Utils_Misc::imageCreateFromBmp($sourceFile);
} else {
$ermsg = 'BMP/JPG images are not supported';
}
}
break;
default:
$ermsg = $sourceImageAttr['mime'].' images are not supported';
break;
}
if (isset($ermsg) || false === $oImage) {
return false;
}
$oThumbImage = imagecreatetruecolor($oSize["Width"], $oSize["Height"]);
if ($sourceImageAttr['mime'] == 'image/png')
{
$bg = imagecolorallocatealpha($oThumbImage, 255, 255, 255, 127); // (PHP 4 >= 4.3.2, PHP 5)
imagefill($oThumbImage, 0, 0 , $bg);
imagealphablending($oThumbImage, false);
imagesavealpha($oThumbImage, true);
}
//imagecopyresampled($oThumbImage, $oImage, 0, 0, 0, 0, $oSize["Width"], $oSize["Height"], $sourceImageWidth, $sourceImageHeight);
CKFinder_Connector_Utils_Misc::fastImageCopyResampled($oThumbImage, $oImage, 0, 0, 0, 0, $oSize["Width"], $oSize["Height"], $sourceImageWidth, $sourceImageHeight, (int)max(floor($quality/20), 6));
switch ($sourceImageAttr['mime'])
{
case 'image/gif':
imagegif($oThumbImage, $targetFile);
break;
case 'image/jpeg':
case 'image/bmp':
imagejpeg($oThumbImage, $targetFile, $quality);
break;
case 'image/png':
imagepng($oThumbImage, $targetFile);
break;
case 'image/wbmp':
imagewbmp($oThumbImage, $targetFile);
break;
}
$_config =& CKFinder_Connector_Core_Factory::getInstance("Core_Config");
if (file_exists($targetFile) && ($perms = $_config->getChmodFiles())) {
$oldUmask = umask(0);
chmod($targetFile, $perms);
umask($oldUmask);
}
imageDestroy($oImage);
imageDestroy($oThumbImage);
return true;
}
/**
* Return aspect ratio size, returns associative array:
* <pre>
* Array
* (
* [Width] => 80
* [Heigth] => 120
* )
* </pre>
*
* @param int $maxWidth
* @param int $maxHeight
* @param int $actualWidth
* @param int $actualHeight
* @return array
* @static
* @access public
*/
public static function getAspectRatioSize($maxWidth, $maxHeight, $actualWidth, $actualHeight)
{
$oSize = array("Width"=>$maxWidth, "Height"=>$maxHeight);
// Calculates the X and Y resize factors
$iFactorX = (float)$maxWidth / (float)$actualWidth;
$iFactorY = (float)$maxHeight / (float)$actualHeight;
// If some dimension have to be scaled
if ($iFactorX != 1 || $iFactorY != 1)
{
// Uses the lower Factor to scale the oposite size
if ($iFactorX < $iFactorY) {
$oSize["Height"] = (int)round($actualHeight * $iFactorX);
}
else if ($iFactorX > $iFactorY) {
$oSize["Width"] = (int)round($actualWidth * $iFactorY);
}
}
if ($oSize["Height"] <= 0) {
$oSize["Height"] = 1;
}
if ($oSize["Width"] <= 0) {
$oSize["Width"] = 1;
}
// Returns the Size
return $oSize;
}
}
lihat baris ke 123 fungsi readfile() telah saya ganti dengan fopen() dan fclose()
berikut ini hasilnya setelah saya mengeditnya
semoga bermanfaat, hanya berbagi pengalaman aja ………
Belajar pemrograman dari sang pemula 
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