生成縮略圖的PHP類

/**


獲得圖像的縮略圖
@name get_minImg_class.php
*
**/
class getMinImg{
 public    $imgSize=array();//存儲img尺寸數組$imgSize['width'],$imgSize['height']
 public  $thum=array();//縮略圖數組$thum['width'],$thum['height']
 public  $newImgSize=array();//生成新圖片的大小$newImgSize['width'],$newImgSize['height']
 private   $imgfunc;//調用的圖片函數名
 private $handle;//文件句柄
 public  $filename;//文件名
 public  $imgInfo=array();//文件信息$imgInfo[0]代表文件路徑及名稱（無后綴）,$imgInfo[1]代表文件類型
 private  $newHandle;//新的文件句柄
function __construct($filename,$thum=array('width'=>150,'height'=>100)){

 $this->filename=$filename;
 if(!(boolean)$this->filename){ return false;}
 $this->thum=$thum;
 $this->getImgType();
 $this->getHandle();
 $this->getImgSize();
 $this->getNewImgSize();
 }

private  function getHandle(){//獲得文件句柄

 switch ($this->imgInfo[1]) {
     case 'jpg':
         $this->handle=imagecreatefromjpeg($this->filename);
         $this->imgfunc="imagejpeg";
         break;
     case 'jpeg':
         $this->handle=imagecreatefromjpeg($this->filename);
         $this->imgfunc="imagejpeg";
         break;    
     case 'png':
         $this->handle=imagecreatefrompng($this->filename);
         $this->imgfunc="imagepng";
         break;    
     case 'gif':
         $this->handle=imagecreatefromgif($this->filename);
         $this->imgfunc="imagegif";
         break;

     default:$this->handle=imagecreatefromjpeg($this->filename);
         $this->imgfunc="imagejpeg";
         break;
 }

}
 public  function getImgType(){//獲得圖像的類型

 $ext=array();
 $ext=explode(".", $this->filename);
 $this->imgInfo=$ext;

}
public function getImgSize(){//獲得圖像大小

 $imgSize=array();
 $arr=getimagesize($this->filename);
 $imgSize['width']=$arr[0];
 $imgSize['height']=$arr[1];
 //var_dump($imgSize);
 $this->imgSize=$imgSize;

}
public function getNewImgSize(){//獲得新圖像的大小

 $newImgSize=array();
 if($this->imgSize['width']>$this->thum['width'] || $this->imgSize['height']>$this->thum['height']){
         if($this->imgSize['width']>$this->imgSize['height']){
             $newImgSize['width']=$this->thum['width'];
             $newImgSize['height']=$this->imgSize['height']*($this->thum['width']/$this->imgSize['width']);    
         }
         if($this->imgSize['height']>$this->imgSize['width']){
             $newImgSize['height']=$this->thum['height'];;
             $newImgSize['width']=$this->imgSize['width']*($this->thum['height']/$this->imgSize['height']);                
         }
         if($this->imgSize['height']===$this->imgSize['width']){
             $newImgSize['height']=$this->thum['height'];
             $newImgSize['width']=$this->thum['width'];
         }
     //echo "big";    
     }else{
         $newImgSize['height']=$this->imgSize['height'];
         $newImgSize['width']=$this->imgSize['width'];
     }
 $this->newImgSize=$newImgSize;

}
public  function  getAndSaveImg(){//重新生成圖片

  $this->newHandle=imagecreatetruecolor($this->newImgSize['width'],$this->newImgSize['height']);
 imagecopyresized($this->newHandle, $this->handle, 0, 0, 0, 0, $this->newImgSize['width'], $this->newImgSize['height'], $this->imgSize['width'], $this->imgSize['height']);
 call_user_func_array($this->imgfunc,array($this->newHandle,"newImg/0001.png"));

}
function __destruct(){

 imagedestroy($this->handle);
 imagedestroy($this->newHandle);

}


}</pre>