How get value for unchecked checkbox in checkbox elements when form posted?

Question

I have a form like below :

Answer 1

Assuming we are using checkboxes with zeros or ones...

Using a hidden checkbox with a zero value is just a work-around. Another work around would be to add 0 to the value when receiving the post or get.

Example:

$chkbx1 = $_POST['chckbx1']; $chkbx1 += 0;

This takes a NULL value an turns it into a zero, but if the value is one, as in its checked, then the value stays the same.

The real issue here isn't inventing a work-around. Its understanding why this is happening. Older versions of mySQL takes null values and converts them into a zero. In newer versions, you must disable strict mode and then a work-around is not needed.

Answer 2

Why have you taken it in an array? You can get the unchecked box as 0 by using "isset"

    if(!isset($_POST['status_2'])
    {
      //Set status_2 parameter as 0
    }

Answer 3

the question may already be answered but i just wanted to take a stab at it...server side only solution:

$p = $_POST;
$a = array();
$a['status_3'] = (int) ($p['status_3'] === 1);
$a['status_2'] = (int) ($p['status_2'] === 1);
$a['status_1'] = (int) ($p['status_1'] === 1);

Testing

 // if input is Array("status_1"=>1) output will be
 Array ( [status_1] => 1 [status_3] => 0 [status_2] => 0 )

 // if input is Array("status_1"=>1, "status_2"=>1) output will be
 Array ( [status_1] => 1 [status_3] => 0 [status_2] => 1)

Answer 4

I thinks it impossible to get array like what you want from html forms. But this some tricks can be used:

$defaultForm = array(
'status_1' => 0,
'status_2' => 0,
'status_3' => 0, 
);

// example array from $_POST
$form = array(
'status_1' => 1,
'status_3' => 1, 
);

$form = array_merge($defaultForm, $form);

Result:

array(3) {

'status_1' => int(1)
'status_2' => int(0)
'status_3' => int(1)

}

Answer 5

Try this one:

for ($i = 1; $i<=3; $i++) {
    $_POST["status_$i"] = isset($_POST["status_$i"]) ? $_POST["status_$i"] : 0; // 0 if not set
}

var_dump($_POST);

Answer 6

I think adding hidden fields like this will work

<input type="hidden" id="status_1_" name="status_1"  value="0">
<input type="checkbox" id="status_1" name="status_1" value="1" />

<input type="hidden" id="status_2_" name="status_2" value="0">
<input type="checkbox" id="status_2" name="status_2" value="1" />

<input type="hidden" id="status_3_" name="status_3" value="0">
<input type="checkbox" id="status_3" name="status_3" value="1" />