Created
August 24, 2010 13:33
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<?php | |
/** | |
* Image helper with automatic image resize and cache | |
* | |
* @author Roman Ozana, ozana@omdesign.cz | |
* @link www.omdesign.cz | |
* | |
* | |
* add to presenter before render function | |
* | |
* $this->template->registerHelper('resize', 'ImageHelper::resize'); | |
* $this->template->registerHelper('resize', 'ImageHelper::gallery'); | |
* | |
* in template | |
* {= 'media/image.jpg'|resize:40} | |
* {= 'media/image.jpg'|resize:?x20} | |
* {= 'media/image.jpg'|resize:40:'alt'} | |
* {= 'media/image.jpg'|resize:40:'alt':'title'} | |
* | |
* gallery link | |
* {= 'media/image.jpg'|gallery} | |
* | |
*/ | |
abstract class ImageHelper | |
{ | |
/** | |
* Set yout folder in public WWW_DIR directory | |
*/ | |
const cache_dir = 'cache'; | |
/** | |
* Helper for simple image tag with resize | |
* | |
* @param string $filename | |
* @param int $width | |
* @param int $height | |
*/ | |
public static function resize($filename, $dimensions = '100x?', $alt = null, $title = null) | |
{ | |
$info = pathinfo($filename); | |
$title = !is_null($alt) && is_null($title) ? $alt : $title; | |
$alt = is_null($alt) ? basename($filename, '.' . $info['extension']) : $alt; | |
list($src, $width, $height) = self::resizeImageWithCache($filename, $dimensions); | |
return Html::el('img')->src($src)->width($width)->height($height)->alt($alt)->title($title); | |
} | |
/** | |
* Render gallery image with anchor to bigger sized image | |
* @param string $filename | |
* @param string $dimensions | |
* @param string $alt | |
* @param string $title | |
* @param string $big | |
*/ | |
public static function gallery($filename, $alt = null, $title = null, $dimensions = '120x70', $full_dimensions = '640x480') | |
{ | |
$img = self::resize($filename, $dimensions, $alt, $title); | |
list($src, $width, $height) = self::resizeImageWithCache($filename, $full_dimensions); | |
return Html::el('a')->href($src)->title($title)->add($img); | |
} | |
/** | |
* Resize image and save thumbs to cache | |
* @param string $original | |
* @param string $dimensions | |
* @param string $subfolder | |
* @param string $public_root | |
* @return array | |
*/ | |
public static function resizeImageWithCache($original, $dimensions, $subfolder = 'cache', $public_root = WWW_DIR) | |
{ | |
if (!is_file($public_root . DIRECTORY_SEPARATOR . $original)) | |
{ | |
return array ($original, null, null); // check if file exist | |
} | |
//////////////////////////////////////// | |
// check internal cache for image | |
//////////////////////////////////////// | |
$cache = Environment::getCache('images'); | |
$key = md5($original . $dimensions . $subfolder . $public_root); | |
if (isset($cache[$key])) | |
{ | |
return $cache[$key]; | |
} | |
$info = pathinfo($original); | |
//////////////////////////////////////// | |
// read dimensions | |
//////////////////////////////////////// | |
$dim = explode('x', $dimensions, null); | |
$newWidth = isset($dim[0]) ? $dim[0] : null; | |
$newHeight = isset($dim[1]) ? $dim[1] : null; | |
//////////////////////////////////////// | |
// check public cache directory | |
//////////////////////////////////////// | |
if (!is_dir($public_root . DIRECTORY_SEPARATOR . $subfolder) || !is_writable($public_root . DIRECTORY_SEPARATOR . $subfolder)) | |
{ | |
InvalidStateException('Thumbnail path ' . $subfolder . ' does not exists or is not writable.'); | |
} | |
try | |
{ | |
$cache_path = $subfolder . DIRECTORY_SEPARATOR . md5(dirname($original)); | |
if (!is_dir($public_root . DIRECTORY_SEPARATOR . $cache_path)) | |
{ | |
mkdir($public_root . DIRECTORY_SEPARATOR . $cache_path); | |
} | |
$image = Image::fromFile($public_root . DIRECTORY_SEPARATOR . $original); | |
$image->resize((int) $newWidth, (int) $newHeight); | |
$cache_file = String::webalize(basename($original, '.' . $info['extension']) . '-' . $image->getWidth() . 'x' . $image->getHeight()) . '.' . $info['extension']; | |
$image->save($cache_path . DIRECTORY_SEPARATOR . $cache_file); | |
//////////////////////////////////////// | |
// resize image name | |
//////////////////////////////////////// | |
$resize = $subfolder . '/' . md5(dirname($original)) . '/' . $cache_file; | |
$result = array ($resize, $image->getWidth(), $image->getHeight()); | |
//////////////////////////////////////// | |
// save result to internal cache | |
//////////////////////////////////////// | |
$cache->save($key, $result, | |
array ('files' => $public_root . DIRECTORY_SEPARATOR . $original)); // 'exire' => time() + 60 * 60) | |
return $result; | |
} | |
catch ( Exception $e ) | |
{ | |
return array ($original, null, null); | |
} | |
} | |
} |
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