PHP 按一定比例压缩图片,保持清晰度

来源:互联网 发布:share p图软件 编辑:程序博客网 时间:2024/05/16 10:33

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"));      ?>  



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