PHP "header (location)" inside IFRAME, to load in _top location?

You are not able to achieve the desired effect in PHP. This is something you'd have to do from JavaScript or add target attribute to <form>:

<form ... target="_top">

You can use javascript to access the parent. You could echo out javascript in your PHP.. so your parent page has this:

function changeURL( url ) {
    document.location = url;
}

and in your php script, you echo

<script>
   parent.changeURL('mypage2.html' );
</script>

The reason you can't call parent.document.location is because it's read only - you have to have a function available on the parent to do it.

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