php remove duplicates from multidimensional array by value

Question

I would like to remove duplicates by value as you can see from the list_title. I know there are several questions and answers to this but their solution doesn\'

Answer 1

So basically you want to remove duplicates by 'list_title' column. Let's assume we keep the first occurrence of this title. Then you can use a couple of standard functions to achieve this:

// Reverse array, so the first occurrence kept.
$data = array_reverse($data);

$result = array_reverse( // Reverse array to the initial order.
    array_values( // Get rid of string keys (make array indexed again).
        array_combine( // Create array taking keys from column and values from the base array.
            array_column($data, 'list_title'), 
            $data
        )
    )
);

Here is working demo.

UPDATE:

Based on @mickmackusa comment, the code can be simplified to:

$result = array_reverse(array_values(array_column(
    array_reverse($data),
    null,
    'list_title'
)));

This is described in the docs regarding column_key parameter specs:

It may also be NULL to return complete arrays or objects (this is useful together with index_key to reindex the array).