Question

Using foreach loops in PHP I would like to add ids to the following object…

$array_before

Array
(
    [1111] => Array
        (
            [Name] => Name A
            [Subcats] => Array
                (
                    [11111] => Array
                        (
                            [Name] => Name A.1
                        )
                    [11112] => Array
                        (
                            [Name] => Name A.2
                        )
                )
        )
    [2222] => Array
        (
            [Name] => Name B
            [Subcats] => Array
                (
                    [22221] => Array
                        (
                            [Name] => Name B.1
                        )
                    [22222] => Array
                        (
                            [Name] => Name B.2
                        )
                )
        )
)

… so it looks similar to the below:

$array_after

Array
(
    [1111] => Array
        (
            [Id] => 1
            [Name] => Name A
            [Subcats] => Array
                (
                    [11111] => Array
                        (
                            [Id] => 1
                            [Name] => Name A.1
                        )
                    [11112] => Array
                        (
                            [Id] => 2                       
                            [Name] => Name A.2
                        )
                    [11113] => Array
                        (
                            [Id] => 3                       
                            [Name] => Name A.2
                        )                       
                )
        )
    [2222] => Array
        (
                    [Id] => 2
                    [Name] => Name B
            [Subcats] => Array
                (
                    [22221] => Array
                        (
                            [Id] => 1                       
                            [Name] => Name B.1
                        )
                    [22222] => Array
                        (
                            [Id] => 2                       
                            [Name] => Name B.2
                        )
                )
        )
)

Could someone point me in the right direction?

Thanks,
LG

Answer 1

Try this:

$id = 0;
array_walk($array,function(&$a) use (&$id) {$a['id'] = ++$id;});

This will modify the originl array to add the IDs, rather than create a new one.