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Thumbnails on the fly with cache from local and remote images
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| <?php | |
| /** | |
| * @description | |
| * Thumbnails on the fly with cache from local and remote images | |
| * | |
| * Parameters: | |
| * image absolute path of local image starting with "/" (e.g. /images/toast.jpg) | |
| * width width of final image in pixels (e.g. 700) | |
| * height height of final image in pixels (e.g. 700) | |
| * nocache (optional) does not read image from the cache | |
| * quality (optional, 0-100, default: 90) quality of output image | |
| * | |
| * @example | |
| * <img src="/thumb.php?width=100&height=100&image=http://url.to/image.jpg" /> | |
| * | |
| * @see https://gist.github.com/dmkuznetsov/f0038b578c1cb6ccd44d | |
| * @license MIT | |
| */ | |
| define('DEFAULT_QUALITY', 90); | |
| define('CACHE_DIR', rtrim(sys_get_temp_dir(), '/') . '/imagecache/'); | |
| define('DOCUMENT_ROOT', $_SERVER['DOCUMENT_ROOT']); | |
| if (!isset($_GET['image'], $_GET['width'], $_GET['height'])) { | |
| header('HTTP/1.1 400 Bad Request'); | |
| echo 'Error: no image/width/height was specified'; | |
| exit(); | |
| } | |
| $resizeWidth = $width = (int)$_GET['width']; | |
| $resizeHeight = $height = (int)$_GET['height']; | |
| $quality = (isset($_GET['quality'])) ? (int)$_GET['quality'] : DEFAULT_QUALITY; | |
| $nocache = isset($_GET['nocache']); | |
| if (!is_dir(CACHE_DIR)) { | |
| mkdir(CACHE_DIR, 0755, true); | |
| } | |
| // Make sure we can read and write the cache directory | |
| if (!is_readable(CACHE_DIR)) { | |
| header('HTTP/1.1 500 Internal Server Error'); | |
| echo 'Error: the cache directory is not readable'; | |
| exit(); | |
| } else if (!is_writable(CACHE_DIR)) { | |
| header('HTTP/1.1 500 Internal Server Error'); | |
| echo 'Error: the cache directory is not writable'; | |
| exit(); | |
| } | |
| $originalImageSource = (string)$_GET['image']; | |
| $image = getImagePath($originalImageSource); | |
| if ($image{0} != '/' || strpos(dirname($image), ':') || preg_match('/(\.\.|<|>)/', $image)) { | |
| header('HTTP/1.1 400 Bad Request'); | |
| echo 'Error: malformed image path. Image paths must begin with \'/\''; | |
| exit(); | |
| } | |
| if (!$image || !file_exists($image)) { | |
| header('HTTP/1.1 404 Not Found'); | |
| echo 'Error: image does not exist: ' . $image; | |
| exit(); | |
| } | |
| $size = getimagesize($image); | |
| $mime = $size['mime']; | |
| if (substr($mime, 0, 6) != 'image/') { | |
| header('HTTP/1.1 400 Bad Request'); | |
| echo 'Error: requested file is not an accepted type: ' . $image; | |
| exit(); | |
| } | |
| $originalWidth = $size[0]; | |
| $originalHeight = $size[1]; | |
| $thumbHash = md5($image . $width . $height . $quality); | |
| $thumbPath = CACHE_DIR . $thumbHash; | |
| if (!$nocache && file_exists($thumbPath)) { | |
| $imageModified = filemtime($image); | |
| $thumbModified = filemtime($thumbPath); | |
| if ($imageModified < $thumbModified) { | |
| $data = file_get_contents($thumbPath); | |
| findBrowserCache(md5($data), gmdate('D, d M Y H:i:s', $thumbModified) . ' GMT'); | |
| header("Content-type: $mime"); | |
| header('Content-Length: ' . strlen($data)); | |
| echo $data; | |
| exit(); | |
| } | |
| } | |
| $saveAlphaChannel = false; | |
| $imageCreationFunction = 'imagecreatefromjpeg'; | |
| $imageOutputFunction = 'imagejpeg'; | |
| $dst = imagecreatetruecolor($width, $height); | |
| switch ($size['mime']) { | |
| case 'image/gif': | |
| $imageCreationFunction = 'imagecreatefromgif'; | |
| $imageOutputFunction = 'imagepng'; | |
| $quality = round(10 - ($quality / 10)); | |
| $saveAlphaChannel = true; | |
| break; | |
| case 'image/x-png': | |
| case 'image/png': | |
| $imageCreationFunction = 'imagecreatefrompng'; | |
| $imageOutputFunction = 'imagepng'; | |
| $quality = round(10 - ($quality / 10)); | |
| $saveAlphaChannel = true; | |
| break; | |
| } | |
| $src = $imageCreationFunction($image); | |
| if ($saveAlphaChannel) { | |
| imagealphablending($dst, false); | |
| imagesavealpha($dst, true); | |
| } | |
| $ratio = $originalWidth / $originalHeight; | |
| if ($width / $height <= $ratio) { | |
| $resizeWidth = $height * $ratio; | |
| } else { | |
| $resizeHeight = $width / $ratio; | |
| } | |
| imagecopyresampled($dst, $src, 0, 0, 0, 0, $resizeWidth, $resizeHeight, $originalWidth, $originalHeight); | |
| $imageOutputFunction($dst, $thumbPath, $quality); | |
| ob_start(); | |
| $imageOutputFunction($dst, null, $quality); | |
| $data = ob_get_contents(); | |
| ob_end_clean(); | |
| imagedestroy($src); | |
| imagedestroy($dst); | |
| if ($nocache && file_exists($image)) { | |
| unlink($image); | |
| } | |
| findBrowserCache(md5($data), gmdate('D, d M Y H:i:s', filemtime($thumbPath)) . ' GMT'); | |
| header("Content-type: $mime"); | |
| header('Content-Length: ' . strlen($data)); | |
| echo $data; | |
| exit; | |
| function getImagePath($image) | |
| { | |
| if (!filter_var($image, FILTER_VALIDATE_URL)) { | |
| $image = DOCUMENT_ROOT . '/' . ltrim($image, '/'); | |
| } else { | |
| $ext = pathinfo(preg_replace('/^(s?f|ht)tps?:\/\/[^\/]+/i', '', $image), PATHINFO_EXTENSION); | |
| $tmpImagePath = CACHE_DIR . md5($image); | |
| if ($ext) { | |
| $tmpImagePath .= '.' . $ext; | |
| } | |
| if (!file_exists($tmpImagePath)) { | |
| $imageContent = file_get_contents($image); | |
| if (!$imageContent) { | |
| header('HTTP/1.1 400 Bad Request'); | |
| echo 'Error: can not download image'; | |
| exit(); | |
| } else { | |
| file_put_contents($tmpImagePath, $imageContent); | |
| } | |
| } | |
| $image = $tmpImagePath; | |
| } | |
| return $image; | |
| } | |
| function findBrowserCache($tag, $lastModified) | |
| { | |
| header("Last-Modified: $lastModified"); | |
| header("ETag: \"{$tag}\""); | |
| $ifNoneMatch = isset($_SERVER['HTTP_IF_NONE_MATCH']) ? | |
| stripslashes($_SERVER['HTTP_IF_NONE_MATCH']) : | |
| false; | |
| $ifModifiedSince = isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) ? | |
| stripslashes($_SERVER['HTTP_IF_MODIFIED_SINCE']) : | |
| false; | |
| if (!$ifModifiedSince && !$ifNoneMatch) { | |
| return; | |
| } | |
| if ($ifNoneMatch && $ifNoneMatch != $tag && $ifNoneMatch != '"' . $tag . '"') { | |
| return; | |
| } | |
| if ($ifModifiedSince && $ifModifiedSince != $lastModified) { | |
| return; | |
| } | |
| header('HTTP/1.1 304 Not Modified'); | |
| exit(); | |
| } |
define('DEFAULT_WIDTH', 250);
define('DEFAULT_HEIGHT', 250);
define('DEFAULT_QUALITY', 100);
define('CACHE_DIR', './imagecache/');
define('DOCUMENT_ROOT', $_SERVER['DOCUMENT_ROOT']);
//if (!isset($_GET['image'], $_GET['width'], $_GET['height'])) {
if (!isset($_GET['image'])) {
header('HTTP/1.1 400 Bad Request');
//echo 'Error: no image/width/height was specified';
echo 'Error: no image was specified';
exit();
}
// $resizeWidth = $width = (int)$_GET['width'];
// $resizeHeight = $height = (int)$_GET['height'];
$resizeWidth = $width = DEFAULT_WIDTH;
$resizeHeight = $height = DEFAULT_HEIGHT;
// OR:
$resizeWidth = $width = (isset($_GET['width'])) ? (int)$_GET['width'] : DEFAULT_WIDTH;
$resizeHeight = $height = (isset($_GET['height'])) ? (int)$_GET['height'] : DEFAULT_HEIGHT;
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I'm trying to add an option for default size so you don't need to specify it for each image. But what i have mange to so far just gives me black images...