如何在已设置不同标头时创建图像（对于JSON响应）

Question

I am writing a simple PHP file to upload a file on POST, and to also create a new image and include the path to that new image in the response.

For the JSON response I have set headers in the main PHP file that the POST is sent to - like so:

    header("Content-Type: application/json");

Just before my JSON encoded echo this is.

Above that part I call a function from another PHP file that uploads the POST file, and one that is called after that rendering a different image using that uploaded file.

In that function in order to create the PNG file I need put on the disc I have to declare a new header right? Like so:

header("Content-type: image/png");

I then ofc get the doublet header problem.

How can I get around this problem?

I cannot use header_remove() BTW.

Answer 1

"In that function in order to create the PNG file I need put on the disc I have to declare a new header right?"

No.

Headers should only be sent to browsers. You don't need to send a header to write to disc.