| 图片压缩类 | | | --- | --- | ``` <?php /** * 图片缩放类 */ class imgCompress{ private $src; #原图片 private $image; private $imageinfo; #原图片的信息 private $percent = 0.5; #缩放比率 /** * [__construct 图片压缩初始化] * @param [type] $src [源图地址] * @param integer $percent [压缩比例] */ public function __construct($src, $percent=1) { $this->src = $src; $this->percent = $percent; } /** * [compressImg 高清压缩图片] * @param string $saveName [提供图片名（可不带扩展名，用源图扩展名）用于保存。或不提供文件名直接显示] * @return [type] [description] */ public function compressImg($saveName='') { return $this->_openImage(); if(!empty($saveName)) $this->_saveImage($saveName); //保存 else $this->_showImage(); } /** * [_openImage 打开图片] * @return [type] [description] */ private function _openImage(){ list($width, $height, $type, $attr) = getimagesize($this->src); #获取图片的宽，高，后缀类型，描述 //压缩图片 if ($width >= 1080 || $height >= 1080) { if(1080/$width >= 1080/$height) { $this->percent = 1080/$height; }else { $this->percent = 1080/$width; } } $this->imageinfo = array( 'width'=>$width, 'height'=>$height, 'type'=>image_type_to_extension($type,false), 'attr'=>$attr ); $fun = "imagecreatefrom".$this->imageinfo['type']; $this->image = $fun($this->src); $this->_thumpImage(); } /** * 内部：操作图片 */ private function _thumpImage() { $new_width = $this->imageinfo['width'] * $this->percent; $new_height = $this->imageinfo['height'] * $this->percent; $image_thump = imagecreatetruecolor($new_width,$new_height); //将原图复制带图片载体上面，并且按照一定比例压缩,极大的保持了清晰度 imagecopyresampled($image_thump,$this->image,0,0,0,0,$new_width,$new_height,$this->imageinfo['width'],$this->imageinfo['height']); imagedestroy($this->image); $this->image = $image_thump; } /** * [_showImage 输出图片:保存图片则用saveImage()] * @return [type] [description] */ public function _showImage() { header('Content-Type: image/'.$this->imageinfo['type']); $funcs = "image".$this->imageinfo['type']; $funcs($this->image); } /** * [_saveImage 保存图片到硬盘：] * @param [type] $dstImgName [1、可指定字符串不带后缀的名称，使用源图扩展名 。2、直接指定目标图片名带扩展名] * @return [type] [description] */ public function _saveImage($dstImgName) { if(empty($dstImgName)) return false; //$allowImgs = ['.jpg', '.jpeg', '.png', '.bmp', '.wbmp','.gif']; //如果目标图片名有后缀就用目标图片扩展名 后缀，如果没有，则用源图的扩展名 $allowImgs = array('.jpg', '.jpeg', '.png', '.bmp', '.wbmp','.gif'); $dstExt = strrchr($dstImgName ,"."); $sourseExt = strrchr($this->src ,"."); if(!empty($dstExt)) $dstExt =strtolower($dstExt); if(!empty($sourseExt)) $sourseExt =strtolower($sourseExt); //有指定目标名扩展名 if(!empty($dstExt) && in_array($dstExt,$allowImgs)){ $dstName = $dstImgName; }elseif(!empty($sourseExt) && in_array($sourseExt,$allowImgs)){ $dstName = $dstImgName.$sourseExt; }else{ $dstName = $dstImgName.$this->imageinfo['type']; } $funcs = "image".$this->imageinfo['type']; $funcs($this->image,$dstName); } /** * [__destruct 销毁图片] */ public function __destruct(){ imagedestroy($this->image); } } #Example $source = './01.jpg'; #原图片 $image = new imgcompress($source); #实例化 $image->compressImg($source); #对图片进行处理 $image->_showImage(); #在浏览器直接输出 $image->_saveImage('555.png'); #把压缩好的图片保存，参数为文件名，可不指定图片后缀 ```