PHP按一定比例压缩图片的方法

<?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);  }    }  ?>

<?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"));  ?>