how do I get all checkbox variables even if not checked from HTML to PHP?

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I just ran into this problem myself. I solved it by adding a duplicate hidden field with the same name. When the browser sends this information, the second field overrides the first (so ensure that the hidden field comes first).

<input type="hidden" name="foo" value="">
<input type="checkbox" name="foo" value="bar">

If the checkbox is not checked you get:

$_REQUEST[ 'foo' ] == ""

If the checkbox is checked you get:

$_REQUEST[ 'foo' ] == "bar"

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