How to populate array values from a single checkbox?

[benphp]

I have a grid, where there is a single checkbox will indicate a yes/no value:

 

Field1 | Field 2
   x   |
   x   |   x

etc.

 

And I'm using an array for each field on each row:

 

<input type=\"checkbox\" name=\"Field1[]\" value=\"$Field1\" />
<input type=\"checkbox\" name=\"Field2[]\" value=\"$Field2\" />

 

The problem: When I cycle through the array, it only contains values for checked boxes - and doesn't contain a value for unchecked boxes. So if my table has 20 rows and 5 are checked, I only get an array with 5 elements.

 

A table with 20 rows, 5 checked:

foreach ($_POST['Field1'] as $f1) {
print "F = $f1 <br />";
}

 

Results:

 

F = 1

F = 1

F = 1

F = 1

F = 1

 

I would expect to get "F= " for the unchecked boxes.

 

It seems like I'm missing something simple.

 

All help is appreciated!

 

B

 

[Pikachu2000]

You will get nothing for unchecked checkboxes. How is the foreach() loop supposed to know that a checkbox isn't checked since the value isn't in the $_POST array? What you need to do is store the possible values in an array, and compare what is present in the $_POST array to the array of possible values. For example, if there were 10 checkboxes, with values from 0-9, you could do something like this.

 

$_POST['checkboxes'] = array( 4, 5, 6, 7); // simulated form data . . . 
$values = array(0, 1, 2, 3, 4, 5, 6, 7, 8, 9); // Possible values of checkboxes
$not_checked = array_diff( $values, $_POST['checkboxes']); // compare values in $_POST['checkboxes'] array to possible values
print_r($not_checked); // lists values not present