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In that case, you would always be using $_GET, not $_POST

But you'll have to make sure ... have a confirmation, "are you sure you want to delete it"?
That <form> or question will then use $_POST....

In the script you showed, I don't see how clicking on <img src="delete.ico" /> will cause a file to be deleted.

There must be some javascripting involved also?

Are you using $_GET or $_POST?

Maybe we need to see what script is coming before the one you are showing?