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@ 2021-04-01T17:33:52Z

<?php

$menu = [
    'root' => [
        'items' => [
            'A' => [
                'p' => [1, 2, 9],
            ],
            'B' => [
                'p' => [1, 2, 3, 9],
            ],
            'C' => [
                'p' => [1, 2, 4, 9],
            ],
            'D' => [
                'items' => [
                    'D1' => [
                        'p' => [1, 2, 3, 4, 9],
                    ],
                    'D2' => [
                        'p' => [1, 2, 3, 4],
                    ],
                ],
            ],
            'E' => [
                'items' => [
                    'E1' => [
                        'p' => [1, 2, 10],
                    ],
                ],
            ],
            'F' => [
                'items' => [
                    'F1' => [
                        'p' => [5, 6],
                    ],
                    'F2' => [
                        'p' => [7, 8],
                    ],
                ],
            ],
        ],
    ],
];
    
    function recursive_ps($elem) {
        $output = [];
        if (isset($elem['items'])) {
            foreach($elem['items'] as $key => $value) {
                if (isset($value['p'])) {
                    $output = array_merge($output, $value['p']);
                }
                if (isset($value['items'])) {
                    // merge the return value of function
                    $output = array_merge($output, recursive_ps($value));
                }
            }
        }
        return $output;
    }
    $output = array_values(array_unique(recursive_ps($menu['root'])));
    print_r($output);

print_r: documentation ( source)
array_merge: documentation ( source)
array_values: documentation ( source)
array_unique: documentation ( source)

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