my-portfolio/dist/api/utils/imgUtils.php

<?php

namespace api\utils;

use Psr\Http\Message\UploadedFileInterface;
use RecursiveDirectoryIterator;
use RecursiveIteratorIterator;

class imgUtils
{
    /**
     * Checks and uploads a file to the given directory
     * @param string $targetDir - Directory to upload the file to
     * @param UploadedFileInterface $img - File to upload
     * @return string|array - String with error message or array with the location of the uploaded file
     */
    public function uploadFile(string $targetDir, UploadedFileInterface $img): string|array
    {
        $targetFile = $targetDir . basename($img->getClientFilename());
        $uploadOk = 1;
        $imageFileType = strtolower(pathinfo($targetFile, PATHINFO_EXTENSION));

        // Check if file already exists
        if (file_exists($targetFile))
        {
            return "The file already exists";
        }

        // Check file size
        if ($img->getSize() > 2000000)
        {
            return "The file is too large, max 2MB";
        }

        // Allow certain file formats
        if ($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg" && $imageFileType != "gif")
        {
            return "Only JPG, JPEG, PNG & GIF files are allowed";
        }

        $img->moveTo($targetFile);

        return array("imgLocation" => $targetFile);
    }

    /**
     * Deletes a directory and all its contents
     * @param string $path - Path to the directory to delete
     */
    public function deleteDirectory(string $path): void
    {
        $iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($path,
            RecursiveDirectoryIterator::SKIP_DOTS), RecursiveIteratorIterator::CHILD_FIRST);

        foreach ($iterator as $file)
        {
            if ($file->isDir())
            {
                rmdir($file->getPathname());
            }
            else
            {
                unlink($file->getPathname());
            }
        }

        rmdir($path);
    }

}