create_image_demo.php

<?php
/*
 * - Switch to composer package
 * - Namespacing
 * - Use file/handler package
 * - Use downloader package
 * - Use image creation package
 */

interface ImageGenerator
{
    public function getImageUrl();
    public function getPrefix();
}

class ThecatapiImageGenerator implements ImageGenerator
{
    public function getImageUrl()
    {
        return 'http://thecatapi.com/api/images/get?format=src&type=png&size=full';
    }

    public function getPrefix()
    {
        return 'cats';
    }
}

class ImageCreator
{
    protected $generator;

    protected $baseFolder;

    protected $imagesPerFolder = 10;

    protected $subfoldersPerFolder = 2;

    protected $folderDepth = 2;

    public function setGenerator(ImageGenerator $generator)
    {
        $this->generator = $generator;
    }

    public function setBaseFolder($folder)
    {
        $this->baseFolder = $folder;
        $this->createFolder($folder);
    }

    public function createFolder($folder)
    {
        if (is_dir($folder)) {
            return false;
        }

        echo "creating folder $folder\n";
        mkdir($folder);
        return true;
    }

    public function generateSubfolders($folder = null, $depth = 0)
    {
        if (empty($folder)) {
            $folder = $this->baseFolder;
        }

        if ($depth > $this->folderDepth) {
            return false;
        }

        for ($i = 1; $i <= $this->imagesPerFolder; $i++) {
            $newImageName = $folder . '/' . basename($folder) . '-' . $i . '.png';
            $this->generateImage($newImageName);
        }

        for ($i = 1; $i <= $this->subfoldersPerFolder; $i++) {
            $newFolderName = $folder . '/' . $this->generator->getPrefix() . '-' . $i;
            $this->createFolder($newFolderName);
            $this->generateSubfolders($newFolderName, $depth + 1);
        }
            
        return false;
    }

    public function generateImage($imageName)
    {
        echo "generating image $imageName\n";
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $this->getDownloadUrl());
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
        $data = curl_exec ($ch);
        curl_close ($ch);
        $file = fopen($imageName, "w+");
        fputs($file, $data);
        fclose($file);
    }

    public function getDownloadUrl()
    {
        return $this->generator->getImageUrl();
    }

    public function setImagesPerFolder($count)
    {
        $this->imagesPerFolder = (int) $count;
    }

    public function setFolderDepth($folderDepth)
    {
        $this->folderDepth = (int) $folderDepth;
    }
}

$imageCreator = new ImageCreator;
$imageCreator->setGenerator(new ThecatapiImageGenerator);
$imageCreator->setBaseFolder(__DIR__ . '/tmp');
$imageCreator->setFolderDepth(2);
$imageCreator->setImagesPerFolder(2);
$imageCreator->generateSubfolders();