PHP 按一定比例压缩图片，保持清晰度

Love The Way You Lie 2022-08-09 17:41 168阅读 0赞

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"));
    
    
    ?>

结果:

![Center][]

[Center]: /images/20220731/4359f41434db4e14ae35710d93db6f1b.png