PHP按一定比例压缩图片的方法
图片压缩是我们日常开发中经常使用的操作，在如今需求很多的情况往往，上传的一张图片会被压缩成不同比例的图片，每次去操作也是一件非常繁琐的事情，于是进行了封装了一个压缩图片的操作类，希望大家遇到后，不用再为写很多压缩图片代码烦恼了。
压缩图片的工具类:
- <?php
- /**
- 图片压缩操作类
- v1.0
- */
- class Image{
- private $src;
- private $imageinfo;
- private $image;
- public $percent = 0.1;
- public function __construct($src){
- $this->src = $src;
- }
- /**
- 打开图片
- */
- public function openImage(){
- list($width, $height, $type, $attr) = getimagesize($this->src);
- $this->imageinfo = array(
- 'width'=>$width,
- 'height'=>$height,
- 'type'=>image_type_to_extension($type,false),
- 'attr'=>$attr
- );
- $fun = "imagecreatefrom".$this->imageinfo['type'];
- $this->image = $fun($this->src);
- }
- /**
- 操作图片
- */
- public 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 = $image_thump;
- }
- /**
- 输出图片
- */
- public function showImage(){
- header('Content-Type: image/'.$this->imageinfo['type']);
- $funcs = "image".$this->imageinfo['type'];
- $funcs($this->image);
- }
- /**
- 保存图片到硬盘
- */
- public function saveImage($name){
- $funcs = "image".$this->imageinfo['type'];
- $funcs($this->image,$name.'.'.$this->imageinfo['type']);
- }
- /**
- 销毁图片
- */
- public function __destruct(){
- imagedestroy($this->image);
- }
- }
- ?>
测试:
- <?php
- require 'image.class.php';
- $src = "001.jpg";
- $image = new Image($src);
- $image->percent = 0.2;
- $image->openImage();
- $image->thumpImage();
- $image->showImage();
- $image->saveImage(md5("aa123"));
- ?>