php图片加水印类-百家乐凯发k8

自己写的一个图片加水印类，暂时只支持水印图片，水印文字的还没有完善
代码不是很完善，欢迎大家交流指正！
调用方式：
先包含类文件
然后实例化类：
$img = new images;
然后提供图片：
$img->imgpath(原图片路径及名称，水印图片路径及名称);
之后开始加水印：
$img->send();
说明：
send( strimg filename ) 这个方法有一个函数，可以省略，在省略的情况下，保存的图片路径和名称和原来的一样，如需保存成例外的图片，就在这里提供要保存的图片路径及名称
例外，还有一个方法，show(); 这个方法用于显示加好水印的图片
这个方法可以单独调用，但必须先调用 send()方法，也可以连续调用： $img->send()->show();

 
imga   = $oldimg;
        $this->imgb   = $newing;
        $this->weizhi = $weizhi;
       return $this;
     }
      
     public function send( $name = '' ){
         !empty( $name ) or $name = $this->imga;
         list($this->imgwa, $this->imgwb, $this->typea) = $this->imgread( $this->imga );
         list($this->imgha, $this->imghb, $this->typeb) = $this->imgread( $this->imgb );
         $this->objecta = $this->openimg( $this->imga, $this->typea );
         $this->objectb = $this->openimg( $this->imgb, $this->typeb );
         $this->wz();
         $this->start();
         $this->over( $name );
         return $this;
     }
     
    private function wz() {
        switch( $this->weizhi ) {
            case 2:
                 $this->x = ( $this->imgwa - $this->imgha ) / 2;
                 break;
            case 3:
                 $this->x = ( $this->imgwa - $this->imgha ); 
                 break;
            case 4:
                 $this->y = ( $this->imgwb - $this->imghb ) / 2 ;
                 break;
            case 5:
                 $this->x = ( $this->imgwa - $this->imgha ) / 2;
                 $this->y = ( $this->imgwb - $this->imghb ) / 2 ;
                 break;
            case 6:
                 $this->x = ( $this->imgwa - $this->imgha );
                 $this->y = ( $this->imgwb - $this->imghb ) / 2 ;
                 break;
            case 7:
                 $this->y = ( $this->imgwb - $this->imghb );
                 break;
            case 8:
                 $this->x = ( $this->imgwa - $this->imgha ) / 2;
                 $this->y = ( $this->imgwb - $this->imghb );
                 break;
            case 9:
                 $this->x = ( $this->imgwa - $this->imgha );
                 $this->y = ( $this->imgwb - $this->imghb );
                 break;
            default:
                $this->x = 0;
                $this->y = 0;
        }
    }
     
    private function openimg( $filename = '', $type = 0 ) {
        switch( $type ) {
            case 1:
                 $obj = imagecreatefromgif( $filename ); break;
            case 2:
                 $obj = imagecreatefromjpeg( $filename ); break;
            case 3:
                 $obj = imagecreatefrompng( $filename ); break;
            default:
                return false;
        }
       return $obj;
    }
     
    private function start(){
        imagecopy( $this->objecta, $this->objectb, $this->x, $this->y, 0, 0, $this->imgha, $this->imghb );
    }
     
    private function over( $name = '1.jpg' ) {
        $this->okfile = $name;
        switch ( $this->typea ) {
            case 1:
                imagegif( $this->objecta, $name );break;
            case 2:
                imagejpeg( $this->objecta, $name );break;
            case 3:
                imagepng( $this->objecta, $name ); break;
            default:
               return false;
        }
    }
     
     
     
    private function imgread( $filepath = '' ) {
        $arr = getimagesize( $filepath );
        return array( $arr[0], $arr[1], $arr[2] );
    }
     
     
   public function show(){
       @header('content-type:image/*');
       echo @file_get_contents( $this->okfile );
   }
     
}