PHP按一定比例壓縮圖片(保持清晰度)

2020-07-16 10:06:04
圖片壓縮是我們日常開發中經常使用的操作,在如今需求很多的情況往往,上傳的一張圖片會被壓縮成不同比例的圖片,每次去操作也是一件非常繁瑣的事情,於是進行了封裝了一個壓縮圖片的操作類,希望大家遇到後,不用再為寫很多壓縮圖片程式碼煩惱了。

壓縮圖片的工具類:

<?php
/**
 圖片壓縮操作類
 v1.0
*/
   class Image{
   
   private $src;
   private $imageinfo;
   private $image;
   public  $percent = 0.1;
   public function __construct($src){
   
   $this->src = $src;
   
   }
   /**
   開啟圖片
   */
   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);
   }
   /**
   操作圖片
   */
   public function thumpImage(){
   
    $new_width = $this->imageinfo['width'] * $this->percent;
$new_height = $this->imageinfo['height'] * $this->percent;
$image_thump = imagecreatetruecolor($new_width,$new_height);
//將原圖複製帶圖片載體上面,並且按照一定比例壓縮,極大的保持了清晰度
imagecopyresampled($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);
   
   }
   /**
   儲存圖片到硬碟
   */
   public function saveImage($name){
   
    $funcs = "image".$this->imageinfo['type'];
$funcs($this->image,$name.'.'.$this->imageinfo['type']);
   
   }
   /**
   銷毀圖片
   */
   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:

678ad1cf96701d3b40bbb530adfaf66.png

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