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เอา code ใน phpThumb.php มาดู แบบนี้ ขออนุญาตินะครับ อยากแก้ไวไว
<?php
//////////////////////////////////////////////////////////////
/// phpThumb() by James Heinrich <[email protected]> //
// available at http://phpthumb.sourceforge.net

///
//////////////////////////////////////////////////////////////
/// //
// See: phpthumb.changelog.txt for recent changes //
// See: phpthumb.readme.txt for usage instructions //
// ///
//////////////////////////////////////////////////////////////

error_reporting(E_ALL);
ini_set('display_errors', '1');
if (!@ini_get('safe_mode')) {
   set_time_limit(60); // shouldn't take nearly this long in most cases, but with many filter and/or a slow server...
}

if (!function_exists('ImageJPEG') && !function_exists('ImagePNG') && !function_exists('ImageGIF')) {
   // base64-encoded error image in GIF format
   $ERROR_NOGD = 'R0lGODlhIAAgALMAAAAAABQUFCQkJDY2NkZGRldXV2ZmZnJycoaGhpSUlKWlpbe3t8XFxdXV1eTk5P7+/iwAAAAAIAAgAAAE/vDJSau9WILtTAACUinDNijZtAHfCojS4W5H+qxD8xibIDE9h0OwWaRWDIljJSkUJYsN4bihMB8th3IToAKs1VtYM75cyV8sZ8vygtOE5yMKmGbO4jRdICQCjHdlZzwzNW4qZSQmKDaNjhUMBX4BBAlmMywFSRWEmAI6b5gAlhNxokGhooAIK5o/pi9vEw4Lfj4OLTAUpj6IabMtCwlSFw0DCKBoFqwAB04AjI54PyZ+yY3TD0ss2YcVmN/gvpcu4TOyFivWqYJlbAHPpOntvxNAACcmGHjZzAZqzSzcq5fNjxFmAFw9iFRunD1epU6tsIPmFCAJnWYE0FURk7wJDA0MTKpEzoWAAskiAAA7';
   header('Content-Type: image/gif');
   echo base64_decode($ERROR_NOGD);
   exit;
}

// this script relies on the superglobal arrays, fake it here for old PHP versions
if (phpversion() < '4.1.0') {
   $_SERVER = $HTTP_SERVER_VARS;
   $_GET = $HTTP_GET_VARS;
}

if (@$_SERVER['PATH_INFO']) {
   $_SERVER['PHP_SELF'] = str_replace($_SERVER['PATH_INFO'], '', @$_SERVER['PHP_SELF']);

   $args = explode(';', substr($_SERVER['PATH_INFO'], 1));
   if (!empty($args)) {
      $_GET['src'] = @$args[count($args) - 1];
   }
   if (eregi('^([0-9]*)x?([0-9]*)$', @$args[count($args) - 2], $matches)) {
      $_GET['w'] = $matches[1];
      $_GET['h'] = $matches[2];
   }
   for ($i = 0; $i < count($args) - 2; $i++) {
      @list($key, $value) = explode('=', @$args[$i]);
      if (substr($key, -2) == '[]') {
         $_GET[substr($key, 0, -2)][] = $value;
      } else {
         $_GET[$key] = $value;
      }
   }
}

// instantiate a new phpThumb() object
ob_start();
if (!include_once(dirname(__FILE__).'/phpthumb.class.php')) {
   ob_end_flush();
   die('failed to include_once("'.realpath(dirname(__FILE__).'/phpthumb.class.php').'")');
}
ob_end_clean();
$phpThumb = new phpThumb();

////////////////////////////////////////////////////////////////
// Debug output, to try and help me diagnose problems
if (@$_GET['phpThumbDebug'] == '0') {
   $phpThumb->phpThumbDebug();
}
////////////////////////////////////////////////////////////////

if (file_exists(dirname(__FILE__).'/phpThumb.config.php')) {
   ob_start();
   if (include_once(dirname(__FILE__).'/phpThumb.config.php')) {
      // great
   } else {
      ob_end_flush();
      $phpThumb->ErrorImage('failed to include_once('.dirname(__FILE__).'/phpThumb.config.php) - realpath="'.realpath(dirname(__FILE__).'/phpThumb.config.php').'"');
   }
   ob_end_clean();
} elseif (file_exists(dirname(__FILE__).'/phpThumb.config.php.default')) {
   $phpThumb->ErrorImage('Please rename "phpThumb.config.php.default" to "phpThumb.config.php"');
} else {
   $phpThumb->ErrorImage('failed to include_once('.dirname(__FILE__).'/phpThumb.config.php) - realpath="'.realpath(dirname(__FILE__).'/phpThumb.config.php').'"');
}

if (@$PHPTHUMB_CONFIG['high_security_enabled']) {
   if (!@$_GET['hash']) {
      $phpThumb->ErrorImage('ERROR: missing hash');
   }
   if (strlen($PHPTHUMB_CONFIG['high_security_password']) < 5) {
      $phpThumb->ErrorImage('ERROR: strlen($PHPTHUMB_CONFIG[high_security_password]) < 5');
   }
   if ($_GET['hash'] != md5(str_replace('&hash='.$_GET['hash'], '', $_SERVER['QUERY_STRING']).$PHPTHUMB_CONFIG['high_security_password'])) {
      $phpThumb->ErrorImage('ERROR: invalid hash');
   }
}

// returned the fixed string if the evil "magic_quotes_gpc" setting is on
if (get_magic_quotes_gpc()) {
   $RequestVarsToStripSlashes = array('src', 'wmf', 'file', 'err', 'goto', 'down');
   foreach ($RequestVarsToStripSlashes as $key) {
      if (isset($_GET[$key])) {
         $_GET[$key] = stripslashes($_GET[$key]);
      }
   }
}

if (!@$_SERVER['PATH_INFO'] && !@$_SERVER['QUERY_STRING']) {

   echo 'phpThumb() v'.$phpThumb->phpthumb_version.'<br><a href="http://phpthumb.sourceforge.net

">http://phpthumb.sourceforge.net

</a><br><br>ERROR: no parameters specified';
   unset($phpThumb);
   exit;

}

if (@$_GET['src'] && isset($_GET['md5s']) && empty($_GET['md5s'])) {
   if (eregi('^(f|ht)tps?://', $_GET['src'])) {
      if ($fp_source = @fopen($_GET['src'], 'rb')) {
         $filedata = '';
         while (true) {
            $buffer = fread($fp_source, 16384);
            if (strlen($buffer) == 0) {
               break;
            }
            $filedata .= $buffer;
         }
         fclose($fp_source);
         $md5s = md5($filedata);
      }
   } else {
      $SourceFilename = $phpThumb->ResolveFilenameToAbsolute($_GET['src']);
      if (is_readable($SourceFilename)) {
         $md5s = phpthumb_functions::md5_file_safe($SourceFilename);
      } else {
         $phpThumb->ErrorImage('ERROR: "'.$SourceFilename.'" cannot be read');
      }
   }
   if (@$_SERVER['HTTP_REFERER']) {
      $phpThumb->ErrorImage('&md5s='.$md5s);
   } else {
      die('&md5s='.$md5s);
   }
}

foreach ($PHPTHUMB_CONFIG as $key => $value) {
   $keyname = 'config_'.$key;
   $phpThumb->setParameter($keyname, $value);
}

////////////////////////////////////////////////////////////////
// Debug output, to try and help me diagnose problems
if (@$_GET['phpThumbDebug'] == '1') {
   $phpThumb->phpThumbDebug();
}
////////////////////////////////////////////////////////////////

$parsed_url_referer = parse_url(@$_SERVER['HTTP_REFERER']);
if ($phpThumb->config_nooffsitelink_require_refer && !in_array(@$parsed_url_referer['host'], $phpThumb->config_nohotlink_valid_domains)) {
   $phpThumb->ErrorImage('config_nooffsitelink_require_refer enabled and '.(@$parsed_url_referer['host'] ? '"'.$parsed_url_referer['host'].'" is not an allowed referer' : 'no HTTP_REFERER exists'));
}
$parsed_url_src = parse_url(@$_GET['src']);
if ($phpThumb->config_nohotlink_enabled && $phpThumb->config_nohotlink_erase_image && eregi('^(f|ht)tps?://', @$_GET['src']) && !in_array(@$parsed_url_src['host'], $phpThumb->config_nohotlink_valid_domains)) {
   $phpThumb->ErrorImage($phpThumb->config_nohotlink_text_message);
}

if ($phpThumb->config_mysql_query) {
   if ($cid = @mysql_connect($phpThumb->config_mysql_hostname, $phpThumb->config_mysql_username, $phpThumb->config_mysql_password)) {
      if (@mysql_select_db($phpThumb->config_mysql_database, $cid)) {
         if ($result = @mysql_query($phpThumb->config_mysql_query, $cid)) {
            if ($row = @mysql_fetch_array($result)) {

               mysql_free_result($result);
               mysql_close($cid);
               $phpThumb->setSourceData($row[0]);
               unset($row);

            } else {
               mysql_free_result($result);
               mysql_close($cid);
               $phpThumb->ErrorImage('no matching data in database.');
            }
         } else {
            mysql_close($cid);
            $phpThumb->ErrorImage('Error in MySQL query: "'.mysql_error($cid).'"');
         }
      } else {
         mysql_close($cid);
         $phpThumb->ErrorImage('cannot select MySQL database: "'.mysql_error($cid).'"');
      }
   } else {
      $phpThumb->ErrorImage('cannot connect to MySQL server');
   }
   unset($_GET['id']);
}

////////////////////////////////////////////////////////////////
// Debug output, to try and help me diagnose problems
if (@$_GET['phpThumbDebug'] == '2') {
   $phpThumb->phpThumbDebug();
}
////////////////////////////////////////////////////////////////

$allowedGETparameters = array('src', 'new', 'w', 'h', 'wp', 'hp', 'wl', 'hl', 'ws', 'hs', 'f', 'q', 'sx', 'sy', 'sw', 'sh', 'zc', 'bc', 'bg', 'bgt', 'fltr', 'file', 'goto', 'err', 'xto', 'ra', 'ar', 'aoe', 'far', 'iar', 'maxb', 'down', 'phpThumbDebug', 'hash', 'md5s');
foreach ($_GET as $key => $value) {
   if (in_array($key, $allowedGETparameters)) {
      $phpThumb->setParameter($key, $value);
   } else {
      $phpThumb->ErrorImage('Forbidden parameter: '.$key);
   }
}

if (!empty($PHPTHUMB_DEFAULTS) && is_array($PHPTHUMB_DEFAULTS)) {
   foreach ($PHPTHUMB_DEFAULTS as $key => $value) {
      if ($PHPTHUMB_DEFAULTS_GETSTRINGOVERRIDE || !isset($_GET[$key])) {
         $phpThumb->setParameter($key, $value);
      }
   }
}

////////////////////////////////////////////////////////////////
// Debug output, to try and help me diagnose problems
if (@$_GET['phpThumbDebug'] == '3') {
   $phpThumb->phpThumbDebug();
}
////////////////////////////////////////////////////////////////

// check to see if file can be output from source with no processing or caching
$CanPassThroughDirectly = true;
if ($phpThumb->rawImageData) {
   // data from SQL, should be fine
} elseif (!@is_file(@$_GET['src']) || !@is_readable(@$_GET['src'])) {
   $CanPassThroughDirectly = false;
}
foreach ($_GET as $key => $value) {
   switch ($key) {
      case 'src':
         // allowed
         break;

      default:
         // all other parameters will cause some processing,
         // therefore cannot pass through original image unmodified
         $CanPassThroughDirectly = false;
         $UnAllowedGET[] = $key;
         break;
   }
}
if (!empty($UnAllowedGET)) {
   $phpThumb->DebugMessage('Cannot pass through directly because $_GET['.implode(';', array_unique($UnAllowedGET)).'] are set', __FILE__, __LINE__);
}

////////////////////////////////////////////////////////////////
// Debug output, to try and help me diagnose problems
if (@$_GET['phpThumbDebug'] == '4') {
   $phpThumb->phpThumbDebug();
}
////////////////////////////////////////////////////////////////

function SendSaveAsFileHeaderIfNeeded() {
   if (headers_sent()) {
      return false;
   }
   global $phpThumb;
   if (@$_GET['down']) {
      $downloadfilename = ereg_replace('[/\\:\*\?"<>|]', '_', $_GET['down']);
      if (phpthumb_functions::version_compare_replacement(phpversion(), '4.1.0', '>=')) {
         $downloadfilename = trim($downloadfilename, '.');
      }
      if (@$downloadfilename) {
         $phpThumb->DebugMessage('SendSaveAsFileHeaderIfNeeded() sending header: Content-Disposition: attachment; filename="'.$downloadfilename.'"', __FILE__, __LINE__);
         header('Content-Disposition: attachment; filename="'.$downloadfilename.'"');
         return true;
      }
   }
   $phpThumb->DebugMessage('SendSaveAsFileHeaderIfNeeded() sending header: Content-Disposition: inline', __FILE__, __LINE__);
   header('Content-Disposition: inline');
   return true;
}

while ($CanPassThroughDirectly && $phpThumb->src) {
   // no parameters set, passthru
   $SourceFilename = $phpThumb->ResolveFilenameToAbsolute($phpThumb->src);

   if (@$_GET['phpThumbDebug']) {

      $phpThumb->DebugMessage('Would have passed "'.$SourceFilename.'" through directly, but skipping due to phpThumbDebug', __FILE__, __LINE__);

   } else {

      // security checks
      if ($GetImageSize = @GetImageSize($SourceFilename)) {
         $ImageCreateFunctions = array(1=>'ImageCreateFromGIF', 2=>'ImageCreateFromJPEG', 3=>'ImageCreateFromPNG');
         if (@$ImageCreateFunctions[$GetImageSize[2]]) {
            $theFunction = $ImageCreateFunctions[$GetImageSize[2]];
            if (function_exists($theFunction) && ($dummyImage = @$theFunction($SourceFilename))) {
               // great
               unset($dummyImage);
            } else {
               $phpThumb->DebugMessage('Not passing "'.$SourceFilename.'" through directly because '.$theFunction.'() failed', __FILE__, __LINE__);
               break;
            }
         } else {
            $phpThumb->DebugMessage('Not passing "'.$SourceFilename.'" through directly because GetImageSize() returned unhandled image type "'.$GetImageSize[2].'"', __FILE__, __LINE__);
            break;
         }
      } else {
         $phpThumb->DebugMessage('Not passing "'.$SourceFilename.'" through directly because GetImageSize() failed', __FILE__, __LINE__);
         break;
      }
      if (headers_sent()) {
         $phpThumb->ErrorImage('Headers already sent ('.basename(__FILE__).' line '.__LINE__.')');
         exit;
      }
      SendSaveAsFileHeaderIfNeeded();
      header('Last-Modified: '.gmdate('D, d M Y H:i:s', @filemtime($SourceFilename)).' GMT');
      if (@$GetImageSize[2]) {
         header('Content-Type: '.phpthumb_functions::ImageTypeToMIMEtype($GetImageSize[2]));
      }
      @readfile($SourceFilename);
      exit;

   }
   break;
}

////////////////////////////////////////////////////////////////
// Debug output, to try and help me diagnose problems
if (@$_GET['phpThumbDebug'] == '5') {
   $phpThumb->phpThumbDebug();
}
////////////////////////////////////////////////////////////////

function RedirectToCachedFile() {
   global $phpThumb, $PHPTHUMB_CONFIG;

   $nice_cachefile = str_replace($phpThumb->osslash, '/', $phpThumb->cache_filename);
   $nice_docroot = str_replace($phpThumb->osslash, '/', rtrim($PHPTHUMB_CONFIG['document_root'], '/\\'));

   $parsed_url = @parse_url(@$_SERVER['HTTP_REFERER']);

   $nModified = filemtime($phpThumb->cache_filename);

   if ($phpThumb->config_nooffsitelink_enabled && @$_SERVER['HTTP_REFERER'] && !in_array(@$parsed_url['host'], $phpThumb->config_nooffsitelink_valid_domains)) {

      $phpThumb->DebugMessage('Would have used cached (image/'.$phpThumb->thumbnailFormat.') file "'.$phpThumb->cache_filename.'" (Last-Modified: '.gmdate('D, d M Y H:i:s', $nModified).' GMT), but skipping because $_SERVER[HTTP_REFERER] ('.@$_SERVER['HTTP_REFERER'].') is not in $phpThumb->config_nooffsitelink_valid_domains ('.implode(';', $phpThumb->config_nooffsitelink_valid_domains).')', __FILE__, __LINE__);

   } elseif ($phpThumb->phpThumbDebug) {

      $phpThumb->DebugMessage('Would have used cached file, but skipping due to phpThumbDebug', __FILE__, __LINE__);
      $phpThumb->DebugMessage('* Would have sent headers (1): Last-Modified: '.gmdate('D, d M Y H:i:s', $nModified).' GMT', __FILE__, __LINE__);
      if ($getimagesize = @GetImageSize($phpThumb->cache_filename)) {
         $phpThumb->DebugMessage('* Would have sent headers (2): Content-Type: '.phpthumb_functions::ImageTypeToMIMEtype($getimagesize[2]), __FILE__, __LINE__);
      }
      if (ereg('^'.preg_quote($nice_docroot).'(.*)$', $nice_cachefile, $matches)) {
         $phpThumb->DebugMessage('* Would have sent headers (3): Location: '.dirname($matches[1]).'/'.urlencode(basename($matches[1])), __FILE__, __LINE__);
      } else {
         $phpThumb->DebugMessage('* Would have sent data: readfile('.$phpThumb->cache_filename.')', __FILE__, __LINE__);
      }

   } else {

      if (headers_sent()) {
         $phpThumb->ErrorImage('Headers already sent ('.basename(__FILE__).' line '.__LINE__.')');
         exit;
      }
      SendSaveAsFileHeaderIfNeeded();

      header('Last-Modified: '.gmdate('D, d M Y H:i:s', $nModified).' GMT');
      if (@$_SERVER['HTTP_IF_MODIFIED_SINCE'] && ($nModified == strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE'])) && @$_SERVER['SERVER_PROTOCOL']) {
         header($_SERVER['SERVER_PROTOCOL'].' 304 Not Modified');
         exit;
      }

      if ($getimagesize = @GetImageSize($phpThumb->cache_filename)) {
         header('Content-Type: '.phpthumb_functions::ImageTypeToMIMEtype($getimagesize[2]));
      }
      if (ereg('^'.preg_quote($nice_docroot).'(.*)$', $nice_cachefile, $matches)) {
         header('Location: '.dirname($matches[1]).'/'.urlencode(basename($matches[1])));
      } else {
         @readfile($phpThumb->cache_filename);
      }
      exit;

   }
   return true;
}

// check to see if file already exists in cache, and output it with no processing if it does
$phpThumb->SetCacheFilename();
if (is_file($phpThumb->cache_filename)) {
   RedirectToCachedFile();
} else {
   $phpThumb->DebugMessage('Cached file "'.$phpThumb->cache_filename.'" does not exist, processing as normal', __FILE__, __LINE__);
}

////////////////////////////////////////////////////////////////
// Debug output, to try and help me diagnose problems
if (@$_GET['phpThumbDebug'] == '6') {
   $phpThumb->phpThumbDebug();
}
////////////////////////////////////////////////////////////////

if ($phpThumb->rawImageData) {

   // great

} elseif (@$_GET['new']) {

   // generate a blank image resource of the specified size/background color/opacity
   if (($phpThumb->w <= 0) || ($phpThumb->h <= 0)) {
      $phpThumb->ErrorImage('"w" and "h" parameters required for "new"');
   }
   @list($bghexcolor, $opacity) = explode('|', $_GET['new']);
   if (!phpthumb_functions::IsHexColor($bghexcolor)) {
      $phpThumb->ErrorImage('BGcolor parameter for "new" is not valid');
   }
   $opacity = (strlen($opacity) ? $opacity : 100);
   if ($phpThumb->gdimg_source = phpthumb_functions::ImageCreateFunction($phpThumb->w, $phpThumb->h)) {
      $alpha = (100 - min(100, max(0, $opacity))) * 1.27;
      if ($alpha) {
         $phpThumb->setParameter('is_alpha', true);
         ImageAlphaBlending($phpThumb->gdimg_source, false);
         ImageSaveAlpha($phpThumb->gdimg_source, true);
      }
      $new_background_color = phpthumb_functions::ImageHexColorAllocate($phpThumb->gdimg_source, $bghexcolor, false, $alpha);
      ImageFilledRectangle($phpThumb->gdimg_source, 0, 0, $phpThumb->w, $phpThumb->h, $new_background_color);
   } else {
      $phpThumb->ErrorImage('failed to create "new" image ('.$phpThumb->w.'x'.$phpThumb->h.')');
   }

} elseif (!$phpThumb->src) {

   $phpThumb->ErrorImage('Usage: '.$_SERVER['PHP_SELF'].'?src=/path/and/filename.jpg'."\n".'read Usage comments for details');

} elseif (eregi('^http\://', $phpThumb->src)) {

   ob_start();
   $HTTPurl = strtr($phpThumb->src, array(' '=>'%20'));
   if ($fp = fopen($HTTPurl, 'rb')) {

      $rawImageData = '';
      do {
         $buffer = fread($fp, 8192);
         if (strlen($buffer) == 0) {
            break;
         }
         $rawImageData .= $buffer;
      } while (true);
      fclose($fp);
      $phpThumb->setSourceData($rawImageData, urlencode($phpThumb->src));

   } else {

      $fopen_error = strip_tags(ob_get_contents());
      ob_end_clean();
      if (ini_get('allow_url_fopen')) {
         $phpThumb->ErrorImage('cannot open "'.$HTTPurl.'" - fopen() said: "'.$fopen_error.'"');
      } else {
         $phpThumb->ErrorImage('"allow_url_fopen" disabled');
      }

   }
   ob_end_clean();

}

////////////////////////////////////////////////////////////////
// Debug output, to try and help me diagnose problems
if (@$_GET['phpThumbDebug'] == '7') {
   $phpThumb->phpThumbDebug();
}
////////////////////////////////////////////////////////////////

$phpThumb->GenerateThumbnail();

////////////////////////////////////////////////////////////////
// Debug output, to try and help me diagnose problems
if (@$_GET['phpThumbDebug'] == '8') {
   $phpThumb->phpThumbDebug();
}
////////////////////////////////////////////////////////////////

if ($phpThumb->config_allow_parameter_file && $phpThumb->file) {

   $phpThumb->RenderToFile($phpThumb->ResolveFilenameToAbsolute($phpThumb->file));
   if ($phpThumb->config_allow_parameter_goto && $phpThumb->goto && eregi('^(f|ht)tps?://', $phpThumb->goto)) {
      // redirect to another URL after image has been rendered to file
      header('Location: '.$phpThumb->goto);
      exit;
   }

} else {

   if ((file_exists($phpThumb->cache_filename) && is_writable($phpThumb->cache_filename)) || is_writable(dirname($phpThumb->cache_filename))) {

      $phpThumb->CleanUpCacheDirectory();
      if ($phpThumb->RenderToFile($phpThumb->cache_filename)) {
         chmod($phpThumb->cache_filename, 0644);
         RedirectToCachedFile();
         $phpThumb->DebugMessage('Failed to match DOCUMENT_ROOT in $phpThumb->cache_filename', __FILE__, __LINE__);
      }
      $phpThumb->DebugMessage('Failed: RenderToFile('.$phpThumb->cache_filename.')', __FILE__, __LINE__);

   } else {

      $phpThumb->DebugMessage('Cannot write to $phpThumb->cache_filename ('.$phpThumb->cache_filename.') because that directory ('.dirname($phpThumb->cache_filename).') is not writable', __FILE__, __LINE__);

   }

}

////////////////////////////////////////////////////////////////
// Debug output, to try and help me diagnose problems
if (@$_GET['phpThumbDebug'] == '9') {
   $phpThumb->phpThumbDebug();
}
////////////////////////////////////////////////////////////////

$phpThumb->OutputThumbnail();

?>

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