進階PHP：按必定比例壓縮圖片，並保持清晰度

圖片壓縮是咱們平常開發中常用的操做，在現在需求不少的狀況每每，上傳的一張圖片會被壓縮成不一樣比例的圖片，每次去操做也是一件很是繁瑣的事情，因而進行了封裝了一個壓縮圖片的操做類，但願你們遇到後，不用再爲寫不少壓縮圖片代碼煩惱了

壓縮圖片的工具類:

<?php
/**
 圖片壓縮操做類
 v1.0
*/
   class Image{
    
   private $src;
   private $imageinfo;
   private $image;
   public  $percent = 0.1;
   public function __construct($src){
    
   $this->src = $src;
    
   }
   /**
   打開圖片
   */
   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);
   }
   /**
   操做圖片
   */
   public function thumpImage(){
    
    $new_width = $this->imageinfo['width'] * $this->percent;
$new_height = $this->imageinfo['height'] * $this->percent;
$image_thump = imagecreatetruecolor($new_width,$new_height);
//將原圖複製帶圖片載體上面，而且按照必定比例壓縮,極大的保持了清晰度
imagecopyresampled($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;
   }
   /**
   輸出圖片
   */
   public function showImage(){
    
    header('Content-Type: image/'.$this->imageinfo['type']);
$funcs = "image".$this->imageinfo['type'];
$funcs($this->image);
    
   }
   /**
   保存圖片到硬盤
   */
   public function saveImage($name){
    
    $funcs = "image".$this->imageinfo['type'];
$funcs($this->image,$name.'.'.$this->imageinfo['type']);
    
   }
   /**
   銷燬圖片
   */
   public function __destruct(){
    
   imagedestroy($this->image);
   }
    
   }
  
  
?>

測試:

<?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"));
  
  
?>

結果：