从相同的PHP文件输出图像，该图像也接收并发送JSON

Question

Ok, I'm hoping I can explain my situation rather than pasting lines and lines of code.

Currently, JSON sends positional info to my PHP file which in turn uses this data to generate an image, saves it and returns the filename via JSON back to browser. Javascript then refreshes the image on screen.

This all works fine at the moment, but I am wanting to optimise the process and look at the possibility of outputting the image file straight after it's created then save afterwards.

My ideal solution would be something like:

    header('Content-Type: image/gif');
    echo $this->canvas;

    // Save user file
    $this->canvas->writeImage( $this->userFile = 'user_img.gif' );          
    $this->canvas->destroy();

    // encode everything and send to browser
    echo json_encode(array('misc data back to the browser'));

(I still need to send data back to browser via JSON)

And in my HTML I would have the image laid out like this:

    <img src='json-processing-script.php' />

But as usual nothing is ever that simple, so I'd like to hear if anyone can make any pointers.

Answer 1

In your example, the json would be added to the gif, messing up your image. If you want to return these two completely different things from your php script, you would have to encode the image, add it to the json and extract it in the javascript to get the source of your image.

See for example this question .