Replace original images with scaled version if WordPress has deleted the originals

replace-original-image-with-scaled.php

<?php

/**
 * This script will copy the scaled images to the original image path in case the original
 * image is missing. It will also regenerate the thumbnails for the original image.
 */
$ids = get_posts([
    'post_type' => 'attachment',
    'post_status' => 'any',
    'posts_per_page' => -1,
    'fields' => 'ids',
    'post_mime_type' => [
        'image/jpeg',
        'image/png',
    ],
]);

foreach ($ids as $id) {
    $file_path = wp_get_original_image_path($id);
    if (file_exists($file_path)) {
        // Original file exists so skip
        continue;
    }
	echo "The original file {$file_path} for attachment {$id} does not exist, trying to replace with -scaled version";
	
    $mimetype = get_post_mime_type($id);
    $file_type = str_replace('image/', '.', $mimetype);
    $scaled_file_path = str_replace($file_type, "-scaled{$file_type}", $file_path);

    if (!file_exists($scaled_file_path)) {
        echo "Scaled file not found: {$scaled_file_path}, skipping\n";
        continue;
    }

    echo "Copying {$scaled_file_path} to {$file_path}\n";
    $copied = copy($scaled_file_path, $file_path);

    if (!$copied) {
        echo "Copying failed: {$scaled_file_path} to {$file_path}\n";
        continue;
    }

    if (!file_exists($file_path)) {
        echo "Copying failed, file not found: {$file_path}\n";
        continue;
    }

    // Regenerate the thumbnails (optional, in case the thumbs are missing, just add continue; before this if you dont need replacing)
    echo "Regenerating thumbnails for {$id}\n";
    $success = wp_create_image_subsizes($file_path, $id);

    if (is_array($success) && !empty($success['sizes'])) {
        echo count($success['sizes']) . " thumbnails regenerated for {$id}\n";
    } else {
        echo "Failed to regenerate thumbnails for {$id}\n";
    }
}