PHP arrays

The following:

        $columns = array();
        foreach($form as $f)
        {
            $columns += array($f['form_field_id'] => $f['label']);
        }

Will create.

Array
(
    [] => 
    [J] => J
    [1] => Title
    [3] => Recruiter
    [2] => Description
    [4] => Job_Type
    [5] => Segment
    [6] => Owner
)

And this will create:

        $columns = array();
        foreach($form as $f)
        {
            $columns[] = array($f['form_field_id'] => $f['label']);
        }

Will create.

Array
(
    [0] => Array
        (
            [] => 
        )
 
    [1] => Array
        (
            [J] => J
        )
 
    [2] => Array
        (
            [1] => Title
        )
 
    [3] => Array
        (
            [3] => Recruiter
        )
 
    [4] => Array
        (
            [2] => Description
        )
 
    [5] => Array
        (
            [4] => Job_Type
        )
 
    [6] => Array
        (
            [5] => Segment
        )
 
    [7] => Array
        (
            [6] => Owner
        )
 
)