先給大家炫下效果圖，如果大家覺得還很滿意，請繼續往下閱讀：
這里說的imagick 是 ImageMagick 在PHP下的擴展。使用pecl安裝起來那叫一個輕松簡單一條命令就搞定：
復制代碼代碼如下:
sudo pecl install imagick
（擴展裝好后還是要在php.ini中加上extension=imagick.so，然后記得重啟apache或php-fpm服務。）
最近有個需求是要把多張圖片組合起來生成縮略圖，剛好用用這個強大的imagick擴展。
這個需求是要這樣生成縮略圖：
1.如果有1張圖片，就直接生成這張圖片的縮略圖；
2.如果有2張圖片，則一張在左邊一張在右邊，各一半；
3.如果有3張圖片，則兩張左邊平均分配，一張獨占右邊；
4.如果有4張圖片，則像田字格一樣平均分配空間；
5.更多張圖片，則只取前4張，按田字格方式生成縮略圖。
這規則還真不少，不過還不算太過復雜，很快搞出來了：
namespace /clarence/thumbnail;class Thumbnail extends /Imagick{/*** @param array $images* @param int $width* @param int $height* @return static* @throws ThumbnailException*/public static function createFromImages($images, $width, $height){if (empty($images)){throw new ThumbnailException("No images!");}$thumbnail = new static();$thumbnail->newImage($width, $height, 'white', 'jpg');$thumbnail->compositeImages($images);return $thumbnail;}public function compositeImages($images){$imagesKeys = array_keys($images);$compositeConfig = $this->calcCompositeImagesPosAndSize($images);foreach ($compositeConfig as $index => $cfg){$imgKey = $imagesKeys[$index];$img = new /Imagick($images[$imgKey]);$img = $this->makeCompositeThumbnail($img, $cfg);$this->compositeImage($img, self::COMPOSITE_OVER, $cfg['to']['x'], $cfg['to']['y']);}}protected function makeCompositeThumbnail(/Imagick $img, $cfg){$img->cropThumbnailImage($cfg['size']['width'], $cfg['size']['height']);return $img;}protected function calcCompositeImagesPosAndSize($images){$width = $this->getImageWidth();$height = $this->getImageHeight();switch(count($images)){case 0:throw new ThumbnailException("No images!");case 1:// | 0 |return [0 => ['to' => [ 'x' => 0, 'y' => 0 ],'size' => ['width' => $width,'height' => $height,]]];case 2:// | 0 | 1 |return [0 => ['to' => [ 'x' => 0, 'y' => 0 ],'size' => ['width' => $width / 2,'height' => $height,]],1 => ['to' => [ 'x' => $width / 2, 'y' => 0],'size' => ['width' => $width / 2,'height' => $height,]]];case 3:// | 0 | 1 |// | 2 | |return [0 => ['to' => [ 'x' => 0, 'y' => 0 ],'size' => ['width' => $width / 2,'height' => $height / 2,]],1 => ['to' => [ 'x' => $width / 2, 'y' => 0],'size' => ['width' => $width / 2,'height' => $height,]],2 => ['to' => [ 'x' => 0, 'y' => $height / 2 ],'size' => ['width' => $width / 2,'height' => $height / 2,]],];default:// >= 4:// | 0 | 1 |// | 2 | 3 |return [0 => ['to' => [ 'x' => 0, 'y' => 0 ],'size' => ['width' => $width / 2,'height' => $height / 2,]],1 => ['to' => [ 'x' => $width / 2, 'y' => 0],'size' => ['width' => $width / 2,'height' => $height / 2,]],2 => ['to' => [ 'x' => 0, 'y' => $height / 2 ],'size' => ['width' => $width / 2,'height' => $height / 2,]],3 => ['to' => [ 'x' => $width / 2, 'y' => $height / 2],'size' => ['width' => $width / 2,'height' => $height / 2,]],];}}} 用個試試：
復制代碼代碼如下:
$thumbnail = /clarence/thumbnail/Thumbnail::createFromImages($srcImages, 240, 320);
$thumbnail->writeImage($outputDir."/example.jpg");
以上內容給大家介紹了PHP利用imagick生成組合縮略圖的相關知識，希望對大家有所幫助！
