PHP按一定比例压缩图片（保持清晰度）

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:

<?phprequire '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:

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