[Resolved] Getting the index of a checkbox array

citress

I have a bunch of checkboxes declared as follows:

The checkboxes are to be eventually stored in a datbase in an array, like
ptProb[0] = 1
ptProb[1] = 0
ptProb[2] = 0
ptProb[3] = 1 etc.
(If the value read from the database is "1" then the checkbox will be checked initially)

As I understand it, if the user checks a particular checkbox, I can access it using $_POST['ptProb'].

If checkbox #1, #3, #5 and #10 are checked, print_r gives me the following output:

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

However the index shown above does not correspond to the checkbox that was selected. What I actually need is something like this:

Array ( [1] => on
[3] => on
[5] => on
[10] => on )

How do I find the correct index of the checkbox?

Thank you for any help/suggestions.

Kudose

You need to be giving your checkboxes values. Server doesn't know what to remember, so it makes them up starting from 0.

rehfeld

you could use indices in the html

<input name="ptProb[1]" type="checkbox">
<input name="ptProb[2]" type="checkbox">
<input name="ptProb[2]" type="checkbox">

citress

Thank you Kudose and rehfeld.

I had missed the value attribute. I'll put up what I came up with in case it helps someone in the future.

Declare the checkboxes -
<input name="ptProb[]" type="checkbox"
value = 1 <? if($ptProb[0] != 0) echo 'checked'; ?> />
<input name="ptProb[]" type="checkbox"
value = 2 <? if($ptProb[1] != 0) echo 'checked'; ?> />
etc..

ptProb[] now contains indexes of the checkboxes that were selected.

ptProb[] = Array ( [0] = 3
[1] = 6
[3] = 7)

Create new array newArr[] as follows -

    $newArr = array();
    foreach ($ptProb as $index => $value)
    {
       $newArr[$value] = true;
    }

newArr[] = Array ([3] = true
[6] = true
[7] = true)

Next - Assign all other newArr[] elements to false
- Use ksort() to sort newArr[] by key
- Use implode to add the necessary ";" or ","
- Save array to database

Thanks again for the help.