<?php

use function Functional\map;
use function Functional\path_or;
use function Functional\prop;
use function Functional\prop_or;
use function Functional\props;
use function Functional\each;

include 'vendor/autoload.php';

$users = [
    ['first_name' => 'John', 'last_name' => 'Doe', 'birth' => 1969, 'languages' => ['js' => 5, 'php' => 10], 'os' => 'Ubuntu'],
    ['first_name' => 'Valerich', 'birth' => 1980],
    (object)['first_name' => 'John', 'last_name' => 'Appleseed', 'birth' => 1985, 'languages' => ['swift' => 15], 'os' => 'macOS'],
    ['first_name' => 'Taylor', 'last_name' => 'Otwell', 'birth' => 1986, 'languages' => ['php' => 12]],
];
$currentYear = (int) date('Y');

$developers = map(
    $users,
    function ($item) use ($currentYear) {
        return [
            'full_name' => implode(' ', props(['first_name', 'last_name'], $item)),
            'php_experience' => path_or(0, ['languages', 'php'], $item),
            'os' => prop_or('Fedora', 'os', $item),
            'age' => $currentYear - prop('birth', $item),
        ];
    }
);

each(
    $developers,
    function ($developer) {
        printf(
            "%s (%d y.o.), enjoys PHP for %d years\n",
            ...props(['full_name', 'age', 'php_experience'], $developer)
        );
    }
);