[PHP] What is wrong with this expression?

[JohnMeyer]

if (is_uploaded_file($_FILES["imagefile"]["tmp_name"]) && ($_FILES["imagefile"]["type"] != "image/jpeg" && $_FILES["imagefile"]["type"] != "image/gif" && $_FILES["imagefile"]["type"] != "image/jpg" && $_FILES["imagefile"]["type"] != "image/png"))

I'm trying to weed out everything that isn't a .jpg, .gif, or .png. What's wrong with this?



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