php - processing checkboxes

Posted on 2014-04-15
Medium Priority
Last Modified: 2014-04-15

I have a php program (attached) designed to process checkboxes on a form. Note the echo was to debug & find out why it wasn't working.

Also attached is the HTML page, as it existed upon calling the php program.

Note in the html program, there are several checkbox elements that are NOT checked. Those elements are NOT being picked up in the php program which defeats the whole purpose.

Why are the unchecked elements NOT being picked up?
Question by:Richard Korts
  • 2
LVL 111

Accepted Solution

Ray Paseur earned 2000 total points
ID: 40002869
Unchecked checkboxes are not present in the request variables.  They are not "there and empty;" they are simply missing.  This is the way that it works.  Dumb design, but an unfortunate fact of life.  Please read this over and see if it helps with the understanding.

Author Comment

by:Richard Korts
ID: 40002890
I thought that MIGHT be the case, but I thought THAT was a stupid idea to even consider

I can envision a workaround.

LVL 111

Expert Comment

by:Ray Paseur
ID: 40002897
The workaround might be an input of an identical name attribute with type="hidden" as described in the article.  I have used that successfully.  It's a PHP-only solution because some languages that use raw post input require specialized programming to deal with the request data.  But if you're using PHP and you use the $_GET or $_POST arrays, you'll be on firm ground.

Thanks for the points, ~Ray

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