tp5压缩本地图片

// $files本地图片地址；参数2：压缩后的图片名称
$img_arr = explode('.', $v['image']);
$type = $img_arr[count($img_arr)-1];
$files = './public/uploads/pro_image' . $v['id'] . '.' . $type;
$saveName = 'pro_image.' . $type
$this->compressedImage($files, $saveName);


/**
	 * desription 压缩图片
	 * @param sting $imgsrc 图片路径
	 * @param string $imgdst 压缩后保存路径
	 */
	private function compressedImage($imgsrc, $imgdst) {
		list($width, $height, $type) = getimagesize($imgsrc);
		// $new_width = $width>800?800:$width;//图片宽度的限制
		// $new_height =$height>800?ceil($height*800/$width):$height;//自适应匹配图片高度
		$new_width = 200;//图片宽度的限制
		$new_height = 200;//自适应匹配图片高度
		
		$thumb_path = './public/thumb_zzzc/'; //缩略图存放路径
		//该目录是否存在  || 不存在创建该目录
		is_dir($thumb_path) || mkdir($thumb_path);
		switch ($type) {
			case 1:
				$giftype = $this->check_gifcartoon($imgsrc);
				if ($giftype) {
					header('Content-Type:image/gif');
					$image_wp = imagecreatetruecolor($new_width, $new_height);
					$image = imagecreatefromgif($imgsrc);
					imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
	//90代表的是质量、压缩图片容量大小
					imagejpeg($image_wp, $imgdst, 90);
					imagedestroy($image_wp);
					imagedestroy($image);
				}
				break;
			case 2:
				header('Content-Type:image/jpeg');
				$image_wp = imagecreatetruecolor($new_width, $new_height);
				$image = imagecreatefromjpeg($imgsrc);
				imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
	//90代表的是质量、压缩图片容量大小
				// imagejpeg($image_wp, $imgdst, 90);
				imagejpeg($image_wp, $thumb_path.$imgdst, 90);
				// imagejpeg($image_wp, ROOT_PATH . 'public' . DS . 'uploads' . DS . 'thumb', 90);
				imagedestroy($image_wp);
				imagedestroy($image);
				break;
			case 3:
				header('Content-Type:image/png');
				$image_wp = imagecreatetruecolor($new_width, $new_height);
				$image = imagecreatefrompng($imgsrc);
				imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
	//90代表的是质量、压缩图片容量大小
				// imagejpeg($image_wp, $imgdst, 90);
				imagejpeg($image_wp, $thumb_path.$imgdst, 90);
				imagedestroy($image_wp);
				imagedestroy($image);
				break;
		}
	}
	
	/**
	 * desription 判断是否gif动画
	 * @param sting image_file图片路径
	 * @return boolean t 是 f 否
	 */
	
	private function check_gifcartoon($image_file){
		$fp = fopen($image_file,'rb');
		$image_head = fread($fp,1024);
		fclose($fp);
		return preg_match("/".chr(0x21).chr(0xff).chr(0x0b).'NETSCAPE2.0'."/",$image_head)?false:true;
	
	}