PHP - How to remove empty entries of an array recursively?

Question

I need to remove empty entries on multilevel arrays. For now I can remove entries with empty sub-arrays, but not empty arrays... confused, so do I... I think the code will h

Answer 1

Here is my solution, it will remove exactly specified list of empty values recursively:

/**
 * Remove elements from array by exact values list recursively
 *
 * @param array $haystack
 * @param array $values
 *
 * @return array
 */
function array_remove_by_values(array $haystack, array $values)
{
    foreach ($haystack as $key => $value) {
        if (is_array($value)) {
            $haystack[$key] = array_remove_by_values($haystack[$key], $values);
        }

        if (in_array($haystack[$key], $values, true)) {
            unset($haystack[$key]);
        }
    }

    return $haystack;
}

You can use it like this:

$clean = array_remove_by_values($raw, ['', null, []]);

Note, it removes empty sub arrays if you pass [] as one of values.