How to convert a multi-dimensional array to a one-dimensional array by a specific key?

Question

PHP

The problem is probably solved easily, but I did not find the answer. Perhaps I'm asking the wrong question. From such a multidimensional array:

Array
(
    [0] => Array
        (
            [id] => 596
            [category] => 84
            [main] => 1
        )

    [1] => Array
        (
            [id] => 596
            [category] => 85
            [main] => 0
        )

)

I need to create a one dimensional array like this:

Array
(
    [0] => 84
    [1] => 85
)

Those. make an array selecting only values ​​with keys [category]
Sorry, I don’t know if I’m expressing myself correctly, but I think the question is clear.

Answer 1

array_column()