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Henry Lin11,636 Points
Why do we need filter category if it's just a selection list?
$category = trim(filter_input(INPUT_POST,'category',FILTER_SANITIZE_STRING));
why do we need filter this if we don't need users to type anything ?
Robert Anthony19,952 Points
It is possible to fake a post request to a website. This means that anyone can put something into your post handler, even if it is not in the drop-down box. You filter it to improve security and prevent any issues.