Create directory structure which mimics flickr's album structure including all photos.

mirror_flickr_albums.php

<?php

declare(strict_types=1);

define('FLICKR_DATA_DIR', '72157673198390467_ce7d69eecfc5_part1');
define('OUTPUT_DIR', __DIR__ . '/output');

$albums = json_decode(file_get_contents(FLICKR_DATA_DIR . '/albums.json'));

foreach ($albums->albums as $album) {
    $albumDir = OUTPUT_DIR . '/' . str_replace(["'", '/'], ['', '-'], $album->title);

    echo $albumDir . PHP_EOL;

    if (!is_dir($albumDir) && !mkdir($albumDir, 0777, true) && !is_dir($albumDir)) {
        throw new \RuntimeException(sprintf('Cannot create directory "%s"', $albumDir));
    }

    foreach ($album->photos as $photoId) {
        if ('0' === $photoId) {
            continue;
        }
        $photo = json_decode(file_get_contents(sprintf('%s/photo_%s.json', FLICKR_DATA_DIR, $photoId)));
        $file  = $albumDir . '/' . pathinfo($photo->original, PATHINFO_BASENAME);
        if (file_exists($file)) {
            continue;
        }
        echo ' +-> ' . $photo->name . ', downloading ... ';
        file_put_contents($file, fopen($photo->original, 'rb'));
        echo 'done' . PHP_EOL;
    }
}

Usage

• adjust FLICKR_DATA_DIR (contains the JSON files from a flickr take-out) and OUTPUT_DIR
• run script with PHP ≥7.0