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It looks like it does not matter what image headers I use for spitting out via php script an image file with unknown extension, call it .ext
Are there any actual effects? (Is PHP silently converting it, or bypassing the format?)
Is the output you get the output you expect?
Maybe the script is outputting an error or the function you are using isn’t binary safe, I’m guessing from your tags that you are using
file_get_contentsbut what you may be looking for isfpassthru?Try opening the file in your browser without setting headers or set a standard html/text header, see if something curious is happening.
Good luck.