Question

i have an array $mainArray of arrays and i would like to remove / undset the arrays that vave keys with no value.

here is my array:

Array
(
[0] => Array
    (
        [msg_id] => 203
        [comment] => Array
            (
                [0] => Array
                    (
                        [com_id] => 
                    )
            )
    )
[1] => Array
    (
        [msg_id] => 202
        [comment] => Array
            (
                [0] => Array
                    (
                        [com_id] => 196
                    )
                [1] => Array
                    (
                        [com_id] => 197
                    )
                [2] => Array
                    (
                        [com_id] => 
                    )
            )
    )
[2] => Array
    (
        [msg_id] => 201
        [comment] => Array
            (
                [0] => Array
                    (
                        [com_id] => 198
                    )
                [1] => Array
                    (
                        [com_id] => 
                    )
            )
    )
)

In this case i would like to look inside comment array arrays and see if there are any of them that have empty values. The best case scenario would be to remove the comment array entirely if all sub arrays are empty.

nut im of with leaving the comment hey there just null

this array should become:

Array
(
    [0] => Array
        (
            [msg_id] => 203
        )
    [1] => Array
        (
            [msg_id] => 202
            [comment] => Array
                (
                    [0] => Array
                        (
                            [com_id] => 196
                        )
                    [1] => Array
                        (
                            [com_id] => 197
                        )
                )
        )
    [2] => Array
        (
            [msg_id] => 201
        )
)

any ideas on how to proceed?

thanks.

Answer 1

$array = array_map(function ($i) {
    $i['comment'] = array_filter($i['comment'], function ($c) { return $c['com_id']; });
    return array_filter($i);
}, $array);

Requires PHP 5.3 or higher.