进阶PHP：按必定比例压缩图片，并保持清晰度

图片压缩是咱们平常开发中常用的操做，在现在需求不少的状况每每，上传的一张图片会被压缩成不一样比例的图片，每次去操做也是一件很是繁琐的事情，因而进行了封装了一个压缩图片的操做类，但愿你们遇到后，不用再为写不少压缩图片代码烦恼了

压缩图片的工具类:

<?php
/**
 图片压缩操做类
 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);
   }
   /**
   操做图片
   */
   public function thumpImage(){
    
    $new_width = $this->imageinfo['width'] * $this->percent;
$new_height = $this->imageinfo['height'] * $this->percent;
$image_thump = imagecreatetruecolor($new_width,$new_height);
//将原图复制带图片载体上面，而且按照必定比例压缩,极大的保持了清晰度
imagecopyresampled($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"));
  
  
?>

结果：