How to extract data out of a specific PHP array

Question

I have a multi-dimensional array that looks like this: The base array is indexed based on category ids from my catalog.

$cat[category_id]

Ea

Answer 1

First you create an empty array, it will be used to store your result.

$result = array();

You need to iterate through your initial array, you can use foreach().

Then, given your parent_category_id simply use an if statement to check whether it's the given id or not.

If it is, just construct and push your result to your $result array.

Use any of the sort functions you like

Use the magic return $result;

You're done.