Scan Images in Bacthes using filesystem in WordPress

wp-scan-images-batch.php

<?php
// Scan images from uploads folder
function fp_scan_images($offset = 0, $batch_size = 500)
{
    try {
        $images     = [];
        $upload_dir = wp_upload_dir();
        $directory  = $upload_dir['basedir'];

        // Recursive scan with FileSystemIterator
        $iterator = new RecursiveIteratorIterator(
            new RecursiveDirectoryIterator($directory, FilesystemIterator::SKIP_DOTS)
        );

        // Limit interation
        $iterator = new LimitIterator($iterator, $offset, $batch_size);

        if (! empty($iterator)) {
            foreach ($iterator as $file) {
                if ($file->isFile() && in_array(strtolower($file->getExtension()), ['jpg', 'jpeg', 'png'], true)) {
                    $images[] = str_replace($directory, $upload_dir['baseurl'], $file->getPathname());
                }
            }
        }

        return ! empty($images) ? array_unique($images) : [];
    } catch (Exception $e) {
        error_log('FlyingPress: Cannot open uploads directory: ' . $e->getMessage());
        return 0;
    }
}