How to run array_filter recursively in a PHP array?

user_445142 0
Viewed 27821

Given the following array $mm

Array
(
    [147] => Array
        (
            [pts_m] => 
            [pts_mreg] => 1
            [pts_cg] => 1
        )    
    [158] => Array
        (
            [pts_m] => 
            [pts_mreg] => 
            [pts_cg] => 0
        )

    [159] => Array
        (
            [pts_m] => 
            [pts_mreg] => 1
            [pts_cg] => 1
        )

)

When I run count(array_filter($mm)) I get 3 as result since it is not recursive.

count(array_filter($mm), COUNT_RECURSIVE) also will not do because I actually need to run the array_filter recursively, and then count its result.

So my question is: how do I recursively run array_filter($mm) in this case? My expected result here would be 4.

Please note that I am not using any callback so I can exclude false, null and empty.

array-filter count recursion php
7 Answers

I needed an array filter recursive function that would walk through all nodes (including arrays, so that we have the possibility to discard entire arrays), and so I came up with this:


    public static function filterRecursive(array $array, callable $callback): array
    {
        foreach ($array as $k => $v) {
            $res = call_user_func($callback, $v);
            if (false === $res) {
                unset($array[$k]);
            } else {
                if (is_array($v)) {
                    $array[$k] = self::filterRecursive($v, $callback);
                }
            }
        }

        return $array;
    }

See more examples here: https://github.com/lingtalfi/Bat/blob/master/ArrayTool.md#filterrecursive

user_4050420

This should work for callback and mode support along with an optional support for depth.

function array_filter_recursive(array $array, callable $callback = null, int $mode = 0, int $depth = -1): array
{
    foreach ($array as & $value) {
        if ($depth != 0 && is_array($value)) {
            $value = array_filter_recursive($value, $callback, $mode, $depth - 1);
        }
    }

    if ($callback) {
        return array_filter($array, $callback, $mode);
    }

    return array_filter($array);
}

Calling the function with $depth = 0 for nested arrays, will yield the same result as array_filter.

user_29383260
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