PHP - jpg / gif到png

Question

I am fiddeling with PHP and i've been at it for so long i really don't see what i'm doing wrong here..

Can anyone help me out and tell me why the converted image is not saved, while the uploaded file gets saved just fine (and, btw, doesn't get deleted)?

  $destination_path = getcwd().DIRECTORY_SEPARATOR."img".DIRECTORY_SEPARATOR."blog".DIRECTORY_SEPARATOR."uploads".DIRECTORY_SEPARATOR;
    $result = 0;

    $ext = pathinfo($_FILES['image']['name'], PATHINFO_EXTENSION); 
    $target_path = $destination_path . $this->input->post("postId") . ".";

    if(move_uploaded_file($_FILES['image']['tmp_name'], $target_path . $ext)) {
        switch ($ext) {
            case ".jpg": case ".jpeg":
                $image = imagecreatefromjpeg($target_path . $ext);
                imagepng($image, $target_path . "png");
                imagedestroy($image);
                break;
            case "gif":
                $image = imagecreatefromgif($target_path . $ext);
                imagepng($image, $target_path . "png");
                imagedestroy($image);
                break;
            default:
            break;
        }
        $result = 1;
   }

Answer 1

$ext将是jpg或jpeg ，并且您在switch语句中检查.jpg或.jpeg ，因此对于这些文件，这将移至默认情况并且不执行任何操作。