php 縮圖類(附調用樣本)

本文介紹下，php實現的一個縮圖類，支援載入圖片檔案與載入圖片字串，按比例展開等，代碼後面有調用樣本供參考。 分享個php縮圖類，可以實現如下的功能： 1，支援載入圖片檔案和載入圖片字串2，可以將縮圖輸出到瀏覽器和保持縮圖檔案3，支援gif，png，jpeg類型的縮減4，可以設定是否按比例來展開 代碼如下： maxWidth = $maxWidth; $this->maxHeight = $maxHeight; $this->scale = $scale; $this->inflate = $inflate; $this->types = array( 'image/jpeg', 'image/png', 'image/gif' ); //載入MIME類型映像的函數名稱 $this->imgLoaders = array( 'image/jpeg' => 'imagecreatefromjpeg', 'image/png' => 'imagecreatefrompng', 'image/gif' => 'imagecreatefromgif' ); //儲存建立MIME類型圖片的函數名稱 $this->imgCreators = array( 'image/jpeg' => 'imagejpeg', 'image/png' => 'imagepng', 'image/gif' => 'imagegif' ); } /** * 檔案方式載入圖片 * @param string $image 源圖片 * @return bool */ public function loadFile($image){ if(!$dims = @getimagesize($image)){ trigger_error("源圖片不存在"); } if(in_array($dims['mime'], $this->types)){ $loader = $this->imgLoaders[$dims['mime']]; $this->source = $loader($image); $this->sourceWidth = $dims[0]; $this->sourceHeight = $dims[1]; $this->sourceMime = $dims['mime']; $this->initThumb(); return TRUE; }else{ trigger_error('不支援'.$dims['mime']."圖片類型"); } } /** * 字串方式載入圖片 * @param string $image 字串 * @param string $mime 圖片類型 * @return type */ public function loadData($image,$mime){ if(in_array($mime, $this->types)){ if($this->source = @imagecreatefromstring($image)){ $this->sourceWidth = imagesx($this->source); $this->sourceHeight = imagesy($this->source); $this->sourceMime = $mime; $this->initThumb(); return TRUE; }else{ trigger_error("不能從字串載入圖片"); } }else{ trigger_error("不支援".$mime."圖片格式"); } } /** * 產生縮圖 * @param string $file 檔案名稱。如果不為空白則儲存為檔案，否則直接輸出到瀏覽器 */ public function buildThumb($file = null){ $creator = $this->imgCreators[$this->sourceMime]; if(isset($file)){ return $creator($this->thumb,$file); }else{ return $creator($this->thumb); } } /** * 處理縮放 */ public function initThumb(){ if($this->scale){ if($this->sourceWidth > $this->sourceHeight){ $this->thumbWidth = $this->maxWidth; $this->thumbHeight = floor($this->sourceHeight*($this->maxWidth/$this->sourceWidth)); }elseif($this->sourceWidth < $this->sourceHeight){ $this->thumbHeight = $this->maxHeight; $this->thumbWidth = floor($this->sourceWidth*($this->maxHeight/$this->sourceHeight)); }else{ $this->thumbWidth = $this->maxWidth; $this->thumbHeight = $this->maxHeight; } } $this->thumb = imagecreatetruecolor($this->thumbWidth, $this->thumbHeight); if($this->sourceWidth <= $this->maxWidth && $this->sourceHeight <= $this->maxHeight && $this->inflate == FALSE){ $this->thumb = $this->source; }else{ imagecopyresampled($this->thumb, $this->source, 0, 0, 0, 0, $this->thumbWidth, $this->thumbHeight, $this->sourceWidth, $this->sourceHeight); } } public function getMine(){ return $this->sourceMime; } public function getThumbWidth(){ return $this->thumbWidth; } public function getThumbHeight(){ return $this->thumbHeight; }}/** * 縮圖類調用樣本(檔案) */$thumb = new Thumbnail(200, 200);$thumb->loadFile('wap.gif');header('Content-Type:'.$thumb->getMine());$thumb->buildThumb();/** * 縮圖類調用樣本(字串) */$thumb = new Thumbnail(200, 200);$image = file_get_contents('wap.gif');$thumb->loadData($image, 'image/jpeg');$thumb->buildThumb('wap_thumb.gif');?>

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