Checkbox Array only showing checked values - PHP

Question

I have a form with many checkboxes.

ex.

...
<input name="dodatkowe[]"  type="checkbox" value="1" />
<input name="dodatkowe[]"  type="checkbox" value="1" />
<input name="dodatkowe[]"  type="checkbox" value="1" />
...

I want to have all the checkboxes in the array. Array 'dodatkowe'.

When i checked all checkboxes have:

Array ( [0] => 1 [1] => 1 [2] => 1 )

but when i checked example only second I have:

Array ( [0] => 1 )

I need that, when i check example second checkbox:

Array ( [0] => 0 [1] => 1 [2] => 0)

Browsers only submit checked checkboxes, so you will never see values for unchecked checkboxes. — Neil
– Neil, Commented Jan 11, 2012 at 21:27

jondavidjohn · Accepted Answer · 2012-01-11 21:29:39Z

4

give them indexes so you can reference them specifically...

...
<input name="dodatkowe[1]"  type="checkbox" value="1" />
<input name="dodatkowe[2]"  type="checkbox" value="1" />
<input name="dodatkowe[3]"  type="checkbox" value="1" />
...

Not sure why you feel you need to see the unchecked values, this can be assumed to be the inverse of the checked values.... Any attempt to do this is a hack, and is unnecessary.

edited Jan 11, 2012 at 21:29

answered Jan 11, 2012 at 21:23

jondavidjohn

62.5k21 gold badges120 silver badges159 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Wrikken Over a year ago

Possibly, each preceded by a: <input name="dodatkowe[1]" type="hidden" value=0"> (alter the number after dodatkowe[ accordingly of course).

bardiir · Accepted Answer · 2012-01-11 21:33:41Z

2

If a checkbox isn't checked it won't include it's value into the parameters but the first step would be to give the checkboxes a unique id:

<input name="dodatkowe[0]"  type="checkbox" value="1" />
<input name="dodatkowe[1]"  type="checkbox" value="1" />
<input name="dodatkowe[2]"  type="checkbox" value="1" />

Then you can use PHP to check is the value is there:

$maxfields = 3;
$selectboxes = $_REQUEST['dodatkowe'];
for($i = 0; $i < $maxfields; $i++)
  if(!isset($selectboxes[$i])) $selectboxes[$i] = 0;

This will set all non existent fields to 0 and $selectboxes should contain the result you are looking for.

edited Jan 11, 2012 at 21:33

answered Jan 11, 2012 at 21:27

bardiir

14.8k9 gold badges45 silver badges66 bronze badges

2 Comments

jondavidjohn Over a year ago

Not sure I like (or would reccomend) directly modifying the $_REQUEST... might get confusing, depending on what further processing you need to do with submitted values.

bardiir Over a year ago

True... you might want to consider to copy that over to another variable before...

Collectives™ on Stack Overflow

Checkbox Array only showing checked values - PHP

2 Answers 2

1 Comment

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related