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Submit Form To Itself?

Rough Divide

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What is the most practical and portable-friendly way of posting a form to itself? Originally I was just using:

<form action=""  method="post">

Though recently when I validated my code, I got this error from W3: " Bad value for attribute action on element form: Must be non-empty." I would guess using <?php echo $_SERVER['PHP_SELF'];?> , but I've read that it isn't safe to use for some reason or another, especially in forms. Can anybody elaborate on that too?

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