Question

$image='xiaofl.jpg';
$img=getimagesize($image);
switch ($img[2])
{
    case 1:
    $im =imagecreatefromgif($image);
    break;
    case 2:
    $im =imagecreatefromjpeg($image);
    break;
    case 3:
    $im =imagecreatefrompng($image);
    break;
}
$word=imagecolorallocate($im,212,0,0);
$str=iconv("gbk","utf-8","php100.com");
imagettftext($im,12,0,20,20,$word,'simkai.ttf',$str);

header("content-type: image/jpeg");
Imagejpeg($im);

Answer 1

There are a lot of ways to do this. You’ll generally want to decide on a single responsibility for each of your classes. Then you will code the class to meet that responsibility in as general a way as possible. In this case, the responsibility might be to display an image with some text added(?).

Here’s one way to do it:

 $image='xiaofl.jpg';
 $imageDisplay = new ImageDisplay($image);
 $imageDisplay->show();


 class ImageDisplay
 {

     private $imageName;

     public function __construct($imageName)
     {
         $this->imageName = $imageName;
     }

     public function show()
     {
         $img=getimagesize($this->imageName);
         switch ($img[2])
         {
             case 1:
             $im =imagecreatefromgif($this->imageName);
             break;
             case 2:
             $im =imagecreatefromjpeg($this->imageName);
             break;
             case 3:
             $im =imagecreatefrompng($this->imageName);
             break;
         }
         $word=imagecolorallocate($im,212,0,0);
         $str=iconv("gbk","utf-8","php100.com");
         imagettftext($im,12,0,20,20,$word,'simkai.ttf',$str);

         header("content-type: image/jpeg");
         Imagejpeg($im);
     }

 }