php - make multidimensional array to flat array path => value

flat_array.php

<?php
function flat_array($array, $delimiter = '/')
{
    $result = [];
    foreach ($array as $key => $value) {
        if (is_array($value)) {
            $subResult = flat_array($value, $delimiter);
            foreach ($subResult as $subKey => $subValue) {
                $result[$key . $delimiter . $subKey] = $subValue;
            }
        } else {
            $result[$key] = $value;
        }
    }

    return $result;
}

test.php

<?php
        $example = [
            'hello',
            'test' => 45,
            46 => 333,
            'testDeep' => [34, 56, 'rr' => ['sdf' => 33, 55,66,23]],
        ];
        print_r($example);

//result
//Array ( [0] => hello [test] => 45 [46] => 333 [testDeep/0] => 34 [testDeep/1] => 56 [testDeep/rr/sdf] => 33 [testDeep/rr/0] => 55 [testDeep/rr/1] => 66 [testDeep/rr/2] => 23 )