Birçok wordpress temasında timthumb aktif olarak kullanılıyor. Bilmeyenler için kısaca açıklayayım timthumb'un ne olduğunu. timthumb resimlerin ön izlemelerini (thumbnail) oluşturmanıza yarayan, cache destekli kod parçacığıdır.

Evet dediğim gibi ön izlemelerini oluştırmaya yarayan. Fakat her zaman ön izlemlerini oluşturmak istemeyiz. Resim kalitesinden ödün versek bile mecbur olduğumuz durumlarda gerekli resimi büyültmemiz gerekebilir. En azından benim bu sıralar üzerinde çalıştığım bir temada bu gerekti.

<?php
/*
	TimThumb script created by Tim McDaniels and Darren Hoyt with tweaks by Ben Gillbanks

http://code.google.com/p/timthumb/

	MIT License: http://www.opensource.org/licenses/mit-license.php

	Paramters
	---------
	w: width
	h: height
	zc: zoom crop (0 or 1)
	q: quality (default is 75 and max is 100)

	HTML example: <img src="/scripts/timthumb.php?src=/images/whatever.jpg&amp;w=150&amp;h=200&amp;zc=1" alt="" />
*/

/*
$sizeLimits = array(
	"100x100",
	"150x150",
);
*/

define ('CACHE_SIZE', 250);		// number of files to store before clearing cache
define ('CACHE_CLEAR', 5);		// maximum number of files to delete on each cache clear
define ('VERSION', '1.09');		// version number (to force a cache refresh

$imageFilters = array(
	"1" => array(IMG_FILTER_NEGATE, 0),
	"2" => array(IMG_FILTER_GRAYSCALE, 0),
	"3" => array(IMG_FILTER_BRIGHTNESS, 1),
	"4" => array(IMG_FILTER_CONTRAST, 1),
	"5" => array(IMG_FILTER_COLORIZE, 4),
	"6" => array(IMG_FILTER_EDGEDETECT, 0),
	"7" => array(IMG_FILTER_EMBOSS, 0),
	"8" => array(IMG_FILTER_GAUSSIAN_BLUR, 0),
	"9" => array(IMG_FILTER_SELECTIVE_BLUR, 0),
	"10" => array(IMG_FILTER_MEAN_REMOVAL, 0),
	"11" => array(IMG_FILTER_SMOOTH, 0),
);

// sort out image source
$src = get_request("src", "");
if($src == "" || strlen($src) <= 3) {
	displayError("no image specified");
}

// clean params before use
$src = cleanSource($src);
// last modified time (for caching)
$lastModified = filemtime($src);

// get properties
$new_width 		= preg_replace("/[^0-9]+/", "", get_request("w", 0));
$new_height 	= preg_replace("/[^0-9]+/", "", get_request("h", 0));
$zoom_crop 		= preg_replace("/[^0-9]+/", "", get_request("zc", 1));
$quality 		= preg_replace("/[^0-9]+/", "", get_request("q", 80));
$filters		= get_request("f", "");

if ($new_width == 0 &amp;&amp; $new_height == 0) {
	$new_width = 100;
	$new_height = 100;
}

// set path to cache directory (default is ./cache)
// this can be changed to a different location
$cache_dir = './cache';

// get mime type of src
$mime_type = mime_type($src);

// check to see if this image is in the cache already
check_cache( $cache_dir, $mime_type );

// if not in cache then clear some space and generate a new file
cleanCache();

ini_set('memory_limit', "30M");

// make sure that the src is gif/jpg/png
if(!valid_src_mime_type($mime_type)) {
	displayError("Invalid src mime type: " .$mime_type);
}

// check to see if GD function exist
if(!function_exists('imagecreatetruecolor')) {
	displayError("GD Library Error: imagecreatetruecolor does not exist");
}

if(strlen($src) &amp;&amp; file_exists($src)) {

	// open the existing image
	$image = open_image($mime_type, $src);
	if($image === false) {
		displayError('Unable to open image : ' . $src);
	}

	// Get original width and height
	$width = imagesx($image);
	$height = imagesy($image);
	/*
	Ben kaldırdım.. Buradan başlar
	// don't allow new width or height to be greater than the original
	if( $new_width > $width ) {
		$new_width = $width;
	}
	if( $new_height > $height ) {
		$new_height = $height;
	}

	// generate new w/h if not provided
	if( $new_width &amp;&amp; !$new_height ) {

		$new_height = $height * ( $new_width / $width );

	} elseif($new_height &amp;&amp; !$new_width) {

		$new_width = $width * ( $new_height / $height );

	} elseif(!$new_width &amp;&amp; !$new_height) {

		$new_width = $width;
		$new_height = $height;

	}
	Burada biter
	*/

	// create a new true color image
	$canvas = imagecreatetruecolor( $new_width, $new_height );
	imagealphablending($canvas, false);
	// Create a new transparent color for image
	$color = imagecolorallocatealpha($canvas, 0, 0, 0, 127);
	// Completely fill the background of the new image with allocated color.
	imagefill($canvas, 0, 0, $color);
	// Restore transparency blending
	imagesavealpha($canvas, true);

	/* Başlar
	if( $zoom_crop ) {

		$src_x = $src_y = 0;
		$src_w = $width;
		$src_h = $height;

		$cmp_x = $width  / $new_width;
		$cmp_y = $height / $new_height;

		// calculate x or y coordinate and width or height of source

		if ( $cmp_x > $cmp_y ) {

			$src_w = round( ( $width / $cmp_x * $cmp_y ) );
			$src_x = round( ( $width - ( $width / $cmp_x * $cmp_y ) ) / 2 );

		} elseif ( $cmp_y > $cmp_x ) {

			$src_h = round( ( $height / $cmp_y * $cmp_x ) );
			$src_y = round( ( $height - ( $height / $cmp_y * $cmp_x ) ) / 2 );

		}

		imagecopyresampled( $canvas, $image, 0, 0, $src_x, $src_y, $new_width, $new_height, $src_w, $src_h );

	 } else {

		// copy and resize part of an image with resampling
		imagecopyresampled( $canvas, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height );

	} 

	Biter*/
	# Alttaki Satırı ben ekledim.
	imagecopyresampled( $canvas, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height );

	if ($filters != "") {
		// apply filters to image
		$filterList = explode("|", $filters);
		foreach($filterList as $fl) {
			$filterSettings = explode(",", $fl);
			if(isset($imageFilters[$filterSettings[0]])) {

				for($i = 0; $i < 4; $i ++) {
					if(!isset($filterSettings[$i])) {
						$filterSettings[$i] = null;
					}
				}

				switch($imageFilters[$filterSettings[0]][1]) {

					case 1:

						imagefilter($canvas, $imageFilters[$filterSettings[0]][0], $filterSettings[1]);
						break;

					case 2:

						imagefilter($canvas, $imageFilters[$filterSettings[0]][0], $filterSettings[1], $filterSettings[2]);
						break;

					case 3:

						imagefilter($canvas, $imageFilters[$filterSettings[0]][0], $filterSettings[1], $filterSettings[2], $filterSettings[3]);
						break;

					default:

						imagefilter($canvas, $imageFilters[$filterSettings[0]][0]);
						break;

				}
			}
		}
	}

	// output image to browser based on mime type
	show_image($mime_type, $canvas, $cache_dir);

	// remove image from memory
	imagedestroy($canvas);

} else {

	if(strlen($src)) {
		displayError("image " . $src . " not found");
	} else {
		displayError("no source specified");
	}

}

/**
 *
 */
function show_image($mime_type, $image_resized, $cache_dir) {

	global $quality;

	// check to see if we can write to the cache directory
	$is_writable = 0;
	$cache_file_name = $cache_dir . '/' . get_cache_file();

	if(touch($cache_file_name)) {

		// give 666 permissions so that the developer
		// can overwrite web server user
		chmod($cache_file_name, 0666);
		$is_writable = 1;

	} else {

		$cache_file_name = NULL;
		header('Content-type: ' . $mime_type);

	}

	$quality = floor($quality * 0.09);

	imagepng($image_resized, $cache_file_name, $quality);

	if($is_writable) {
		show_cache_file($cache_dir, $mime_type);
	}

	imagedestroy($image_resized);

	displayError("error showing image");

}

/**
 *
 */
function get_request( $property, $default = 0 ) {

	if( isset($_REQUEST[$property]) ) {

		return $_REQUEST[$property];

	} else {

		return $default;

	}

}

/**
 *
 */
function open_image($mime_type, $src) {

	if(stristr($mime_type, 'gif')) {

		$image = imagecreatefromgif($src);

	} elseif(stristr($mime_type, 'jpeg')) {

		@ini_set('gd.jpeg_ignore_warning', 1);
		$image = imagecreatefromjpeg($src);

	} elseif( stristr($mime_type, 'png')) {

		$image = imagecreatefrompng($src);

	}

	return $image;

}

/**
 * clean out old files from the cache
 * you can change the number of files to store and to delete per loop in the defines at the top of the code
 */
function cleanCache() {

	$files = glob("cache/*", GLOB_BRACE);

	$yesterday = time() - (24 * 60 * 60);

	if (count($files) > 0) {

		usort($files, "filemtime_compare");
		$i = 0;

		if (count($files) > CACHE_SIZE) {

			foreach ($files as $file) {

				$i ++;

				if ($i >= CACHE_CLEAR) {
					return;
				}

				if (filemtime($file) > $yesterday) {
					return;
				}

				unlink($file);

			}

		}

	}

}

/**
 * compare the file time of two files
 */
function filemtime_compare($a, $b) {

	return filemtime($a) - filemtime($b);

}

/**
 * determine the file mime type
 */
function mime_type($file) {

	if (stristr(PHP_OS, 'WIN')) {
		$os = 'WIN';
	} else {
		$os = PHP_OS;
	}

	$mime_type = '';

	if (function_exists('mime_content_type')) {
		$mime_type = mime_content_type($file);
	}

	// use PECL fileinfo to determine mime type
	if (!valid_src_mime_type($mime_type)) {
		if (function_exists('finfo_open')) {
			$finfo = finfo_open(FILEINFO_MIME);
			$mime_type = finfo_file($finfo, $file);
			finfo_close($finfo);
		}
	}

	// try to determine mime type by using unix file command
	// this should not be executed on windows
    if (!valid_src_mime_type($mime_type) &amp;&amp; $os != "WIN") {
		if (preg_match("/FREEBSD|LINUX/", $os)) {
			$mime_type = trim(@shell_exec('file -bi "' . $file . '"'));
		}
	}

	// use file's extension to determine mime type
	if (!valid_src_mime_type($mime_type)) {

		// set defaults
		$mime_type = 'image/png';
		// file details
		$fileDetails = pathinfo($file);
		$ext = strtolower($fileDetails["extension"]);
		// mime types
		$types = array(
 			'jpg'  => 'image/jpeg',
 			'jpeg' => 'image/jpeg',
 			'png'  => 'image/png',
 			'gif'  => 'image/gif'
 		);

		if (strlen($ext) &amp;&amp; strlen($types[$ext])) {
			$mime_type = $types[$ext];
		}

	}

	return $mime_type;

}

/**
 *
 */
function valid_src_mime_type($mime_type) {

	if (preg_match("/jpg|jpeg|gif|png/i", $mime_type)) {
		return true;
	}

	return false;

}

/**
 *
 */
function check_cache($cache_dir, $mime_type) {

	// make sure cache dir exists
	if (!file_exists($cache_dir)) {
		// give 777 permissions so that developer can overwrite
		// files created by web server user
		mkdir($cache_dir);
		chmod($cache_dir, 0777);
	}

	show_cache_file($cache_dir, $mime_type);

}

/**
 *
 */
function show_cache_file($cache_dir) {

	$cache_file = $cache_dir . '/' . get_cache_file();

	if (file_exists($cache_file)) {

		$gmdate_mod = gmdate("D, d M Y H:i:s", filemtime($cache_file));

		if(! strstr($gmdate_mod, "GMT")) {
			$gmdate_mod .= " GMT";
		}

		if (isset($_SERVER["HTTP_IF_MODIFIED_SINCE"])) {

			// check for updates
			$if_modified_since = preg_replace("/;.*$/", "", $_SERVER["HTTP_IF_MODIFIED_SINCE"]);

			if ($if_modified_since == $gmdate_mod) {
				header("HTTP/1.1 304 Not Modified");
				exit;
			}

		}

		$fileSize = filesize($cache_file);

		// send headers then display image
		header("Content-Type: image/png");
		header("Accept-Ranges: bytes");
		header("Last-Modified: " . $gmdate_mod);
		header("Content-Length: " . $fileSize);
		header("Cache-Control: max-age=9999, must-revalidate");
		header("Expires: " . $gmdate_mod);

		readfile($cache_file);

		exit;

	}

}

/**
 *
 */
function get_cache_file() {

	global $lastModified;
	static $cache_file;

	if(!$cache_file) {
		$cachename = $_SERVER['QUERY_STRING'] . VERSION . $lastModified;
		$cache_file = md5($cachename) . '.png';
	}

	return $cache_file;

}

/**
 * check to if the url is valid or not
 */
function valid_extension ($ext) {

	if (preg_match("/jpg|jpeg|png|gif/i", $ext)) {
		return TRUE;
	} else {
		return FALSE;
	}

}

/**
 * tidy up the image source url
 */
function cleanSource($src) {

	// remove slash from start of string
	if(strpos($src, "/") == 0) {
		$src = substr($src, -(strlen($src) - 1));
	}

	// remove http/ https/ ftp
	$src = preg_replace("/^((ht|f)tp(s|):\/\/)/i", "", $src);
	// remove domain name from the source url
	$host = $_SERVER["HTTP_HOST"];
	$src = str_replace($host, "", $src);
	$host = str_replace("www.", "", $host);
	$src = str_replace($host, "", $src);

	// don't allow users the ability to use '../'
	// in order to gain access to files below document root

	// src should be specified relative to document root like:
	// src=images/img.jpg or src=/images/img.jpg
	// not like:
	// src=../images/img.jpg
	$src = preg_replace("/\.\.+\//", "", $src);

	// get path to image on file system
	$src = get_document_root($src) . '/' . $src;	

	return $src;

}

/**
 *
 */

function get_document_root ($src) {

	// check for unix servers
	if(@file_exists($_SERVER['DOCUMENT_ROOT'] . '/' . $src)) {
		return $_SERVER['DOCUMENT_ROOT'];
	}

	// check from script filename (to get all directories to timthumb location)
	$parts = array_diff(explode('/', $_SERVER['SCRIPT_FILENAME']), explode('/', $_SERVER['DOCUMENT_ROOT']));
	$path = $_SERVER['DOCUMENT_ROOT'] . '/';
	foreach ($parts as $part) {
		$path .= $part . '/';
		if (file_exists($path . $src)) {
			return $path;
		}
	}	

	// the relative paths below are useful if timthumb is moved outside of document root
	// specifically if installed in wordpress themes like mimbo pro:
	// /wp-content/themes/mimbopro/scripts/timthumb.php
	$paths = array(
		".",
		"..",
		"../..",
		"../../..",
		"../../../..",
		"../../../../.."
	);

	foreach($paths as $path) {
		if(@file_exists($path . '/' . $src)) {
			return $path;
		}
	}

	// special check for microsoft servers
	if(!isset($_SERVER['DOCUMENT_ROOT'])) {
    	$path = str_replace("/", "\\", $_SERVER['ORIG_PATH_INFO']);
    	$path = str_replace($path, "", $_SERVER['SCRIPT_FILENAME']);

    	if( @file_exists( $path . '/' . $src ) ) {
    		return $path;
    	}
	}	

	displayError('file not found ' . $src);

}

/**
 * generic error message
 */
function displayError($errorString = '') {

	header('HTTP/1.1 400 Bad Request');
	die($errorString);

}
?>

Bu bizim timthumb.php miz. Bu isimde kayıt edelim elimizin altında bulunsun.

Resim kırpma işlemlerinde kalite azalmasınveya başka sebeplerden dolayı oranlara göre kırpma işlemi yapılır. Ben burada onun aktifliğini kaldırdım. Kod betiği içerisinde de açıklamalar mevcut, nereden nereye kadar kaldırıldığı konusunda. Bu özelliği kaldırdığım için siz ne yükseklik ve genişlik değeri verirseniz, timthumb o değeri uygulayacaktır. Gelelim kullanımına,

Bu adresde ingilizce olarak anlatılmış.

Timthumb eğer izinleri yeterse otomatik olarak bulunduğu dizinde bir cache klasörü yaratacaktır. Eğer yaratamamışsa, siz yaratıp chmod ayarınıda 777 yapınız.

Timthumb'ın paremetreleri

• w = genişlik
• h = yükseklik
• zc = zoom crop (orantılı kırpma) (0 yada 1)
• q= kalite (Varsayılan 75, maksimum 100)

Örnek kullanım şekli

<img src="/scripts/timthumb.php?src=/images/whatever.jpg&amp;h=150&amp;w=150&amp;zc=1&amp;q=85" alt="">

Benim yukarıda verdğim, editlenmiş hali. zoom crop özelliği devre dışı bıraklımıştır. Örnek kullanımda verdiğiniz yükseklik ve genişlik değerleri aynen resminize uygulanır. Eğer gerçek timthumb ile çalışmak istiyorsanız timthumb sayfasına göz gezdirebilirsiniz.

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