<?php

$files = scandir('.', SCANDIR_SORT_NONE);
if (!$files) {
    http_response_code(500);
    exit(1);
}

mime_content_type('application/json');

function images($path) {
    return preg_match('/\.(jpg|png)$/', $path);
}

echo json_encode(array_values(array_filter($files, 'images')))
?>