Zip Lists, FUB Code Golf

GeraldZip.php

<?php
/**
 * FollowUpBoss: Real Estate Lead Management Software.
 *
 * @author        Gerald Leenerts
 * @copyright     Copyright (c) 2022, Enchant LLC.
 * @license       Property of Enchant LLC. All rights reserved.
 * @prettier
 */

declare(strict_types=1);

namespace richdesk\extensions\command;

function zip(array $firstArray, array $secondArray, array $acc = [], int $index = 0)
{
    // If we are beyond the first array index, no need to continue
    if (count($firstArray) <= $index) {
        return $acc;
    }

    // Add first first item in the list
    $acc[] = $firstArray[$index];

    // The array we are zipping, if it is empty, then we are done, no need to proceed.
    if (empty($secondArray[$index])) {
        return $acc;
    }

    // Push on the zipped item
    $acc[] = $secondArray[$index];

    // Call the next iteration
    return zip($firstArray, $secondArray, $acc, $index + 1);
}

function testZip(string $name, array $first, array $second, array $expected)
{
    $actual = zip($first, $second);

    if (json_encode($actual) === json_encode($expected)) {
        echo $name . ' OK! ' . json_encode($actual) . "\n";
    } else {
        echo $name . " FAILED:\n";
        echo '  expected: ' . json_encode($expected) . "\n";
        echo '    actual: ' . json_encode($actual) . "\n";
    }
}

class Gerald extends \richdesk\extensions\console\Command
{
    protected $_quiet = ['run'];

    public function run()
    {
        testZip('Test Zip 1', [], [], []);
        testZip('Test Zip 2', [], [1, 2, 3], []);
        testZip('Test Zip 3', [1, 2, 3], [], [1]);
        testZip('Test Zip 4', [1, 2], [3], [1, 3, 2]);
        testZip(
            'Test Zip 5',
            [1, 2, 3, 4, 5],
            [11, 12, 13],
            [1, 11, 2, 12, 3, 13, 4]
        );
        testZip('Test Zip 6', [9, 9, 9], [8, 8, 8], [9, 8, 9, 8, 9, 8]);
        testZip('Test Zip 7', [1, 2, 3], [4, 5, 6, 7], [1, 4, 2, 5, 3, 6]);
    }
}

Makes sense. I almost went that route but for some reason decided to keep it to count