Flattening a PHP multidimensional array.

FlattenMultidimensionalArray.php

<?php

$array = [
    'personal' => [
        'name' => 'Haven Shen',
        'age' => 18,
    ],
    'gift' => [
        'name' => 'car',
        'key' => [
            'more'
        ]
    ],
    'money' => [
        'card' => 10000000.00
    ],
    'more'
];

function flatten_array(array $items, array $flattened = []) {
    foreach ($items as $item) {
        if (is_array($item)) {
            $flattened = flatten_array($item, $flattened);
            continue;
        }

        $flattened[] = $item;
    }

    return $flattened;
}

var_dump(flatten_array($array));

$flattened = iterator_to_array(new RecursiveIteratorIterator(
    new RecursiveArrayIterator($array)
), false);

var_dump($flattened);