Doubt passing parameters via form

Question

Doubt, I can’t send the image.

Way: _img/_products/photo2-green.png

<input type="radio" name="cor" id="verde" value="verde"> 

<img src="_img/_produtos/foto<?=$_POST['???']?>-<?=$_POST['cor']?>.png">

That last code has to work on me : _img/_products/photo2-green.png

The way it is, it brings me to it: _img/_products/photo???-green.png

Answer 1

Ai is only saying that your ID passed by post is undefined (does not exist), but this is normal, because you are only passing the 'color'

if you want to upload an image you will need to use a file input and then in php you will need to use $_FILE['filename'

Answer 2

I solved the problem, the solution is below:

Just add an input type Hidden

<input type="hidden" name="numproduto" value="2">

And complement the display code:

<img src="_img/_produtos/foto<?=$_POST['numproduto']?>-<?=$_POST['cor']?>.png"
            class="img-thumbnail img-responsive">