wp-scan-non-optimized-images-v1.php

<?php
// Get difference of two folders and get non-optimised images
function fp_scan_all_images()
{
    $upload_dir     = wp_upload_dir();
    $uploads_path   = $upload_dir['basedir'];
    $uploads_url    = $upload_dir['baseurl'];
    $optimized_path = WP_CONTENT_DIR . '/flying-press-images';

    // Step 1: Build lookup for optimized files
    $optimized_lookup = [];
    if (is_dir($optimized_path)) {
        $opt_iterator = new RecursiveIteratorIterator(
            new RecursiveDirectoryIterator($optimized_path, FilesystemIterator::SKIP_DOTS)
        );
        foreach ($opt_iterator as $opt_file) {
            if ($opt_file->isFile()) {
                $relative = str_replace($optimized_path, '', $opt_file->getPathname());
                $optimized_lookup[$relative] = true;
            }
        }
    }

    // Step 2: Find uploads not in optimized lookup
    $missing = [];
    $uploads_iterator = new RecursiveIteratorIterator(
        new RecursiveDirectoryIterator($uploads_path, FilesystemIterator::SKIP_DOTS)
    );
    foreach ($uploads_iterator as $file) {
        if ($file->isFile()) {
            if (!in_array(strtolower($file->getExtension()), ['jpg', 'jpeg', 'png'], true)) {
                continue;
            }
            $relative = str_replace($uploads_path, '', $file->getPathname());

            if (!isset($optimized_lookup[$relative])) {
                $missing[] = $uploads_url . $relative; // Full URL
            }
        }
    }

    error_log(print_r($missing, true));
}