WP Visual Composer (WP Bakery) Migrate Gallery & Image Carousel shortcodes to regular WP shortcodes

wpbakeryGalleryMigrator.php

<?php
/**
 * Plugin Name: VC Gallery Migrator - NO FATAL ERROR
 * Description: SAFE version - replaces [vc_gallery images="20129,20130,20132"...] → [gallery ids="20129,20130,20132"]
 * Version: 5.0 - STABLE
 */

if ( ! defined( 'ABSPATH' ) ) exit;

add_action( 'admin_menu', 'vc_gallery_safe_menu' );
function vc_gallery_safe_menu() {
    add_management_page( 'VC Gallery Migrator', 'VC Gallery Migrator', 'manage_options', 'vc-gallery-migrator', 'vc_gallery_safe_page' );
}

function vc_gallery_safe_page() {
    if ( ! current_user_can( 'manage_options' ) ) wp_die( 'No access' );

    $debug_info = $stats = $message = '';
    $dry_run = isset( $_POST['dry_run'] ) ? true : false;
    
    if ( isset( $_POST['run'] ) && wp_verify_nonce( $_POST['nonce'], 'vc_gallery_safe' ) ) {
        $result = vc_gallery_safe_migrate( $dry_run );
        
        $status_class = $dry_run ? 'notice-warning' : 'notice-success';
        $action = $dry_run ? 'PREVIEWED' : '✅ REPLACED';
        
        $stats = sprintf(
            '<div class="notice %s"><p><strong>%s:</strong><br>
            Found: %d galleries | Replaced: %d | Posts updated: %d</p></div>',
            $status_class, $action, $result['found'], $result['replaced'], $result['posts']
        );
        
        // Simple safe debug table
        $debug_info = '<h3>📋 GALLERIES FOUND:</h3>';
        foreach ( array_slice( $result['details'], 0, 10 ) as $i => $detail ) {
            $debug_info .= sprintf(
                '<p><strong>Gallery #%d:</strong> <code>%s</code> → <code>[gallery ids="%s"]</code></p>',
                $i + 1,
                esc_html( $detail['original'] ),
                esc_attr( $detail['gallery'] )
            );
        }
        
        $message = $dry_run 
            ? '<p><strong>✅ Preview OK! Uncheck "Dry Run" to replace.</strong></p>'
            : '<p><strong>🎉 All galleries replaced successfully!</strong></p>';
    }
    
    ?>
    <div class="wrap">
        <h1>🖼️ VC Gallery Migrator - SAFE</h1>
        <?php echo $stats . $debug_info . $message; ?>
        
        <form method="POST">
            <?php wp_nonce_field( 'vc_gallery_safe', 'nonce' ); ?>
            <p>
                <label>
                    <input type="checkbox" name="dry_run" <?php checked( $dry_run ); ?>> 
                    Dry Run (Preview - No changes)
                </label><br>
                <input type="submit" name="run" class="button-primary" 
                       value="<?php echo $dry_run ? '🔍 Preview Galleries' : '🚀 Replace All Galleries'; ?>" 
                       onclick="return confirm('<?php echo $dry_run ? 'Preview?' : 'BACKUP FIRST! This replaces ALL VC galleries.'; ?>')">
            </p>
        </form>
        
        <h3>🔄 Converts exactly:</h3>
        <p><code>[vc_gallery interval="3" images="20129,20130,20132" img_size="medium" onclick="img_link_large"]</code><br>
        ↓<br><code>[gallery ids="20129,20130,20132"]</code></p>
    </div>
    <?php
}

function vc_gallery_safe_migrate( $dry_run = true ) {
    global $wpdb;
    
    $posts = $wpdb->get_results("SELECT ID, post_content FROM {$wpdb->posts} WHERE post_content LIKE '%vc_gallery%' OR post_content LIKE '%vc_images_carousel%' AND post_status != 'trash'");
    
    $found = $replaced = $posts_changed = 0;
    $details = [];

    foreach ( $posts as $post ) {
        $content = $post->post_content;
        $original_content = $content;
        
        // ✅ SAFE REGEX - No complex patterns, no callbacks
        if ( preg_match_all( '/\[vc_gallery\s+[^]]*images=["\']([^"\']+)["\'][^\]]*\]/i', $content, $matches, PREG_SET_ORDER ) ) {
            foreach ( $matches as $match ) {
                $ids_string = $match[1]; // "20129,20130,20132"
                $full_shortcode = $match[0];
                
                $ids = array_map( 'intval', explode( ',', $ids_string ) );
                $ids = array_filter( $ids ); // Remove empty
                
                $gallery_ids = implode( ',', $ids );
                $replacement = '[gallery ids="' . $gallery_ids . '"]';
                
                $content = str_replace( $full_shortcode, $replacement, $content );
                
                $details[] = [
                    'original' => $full_shortcode,
                    'gallery' => $gallery_ids
                ];
                
                $found++;
                $replaced++;
            }
        }
        
        // Also check vc_images_carousel
        if ( preg_match_all( '/\[vc_images_carousel\s+[^]]*images=["\']([^"\']+)["\'][^\]]*\]/i', $content, $matches, PREG_SET_ORDER ) ) {
            foreach ( $matches as $match ) {
                $ids_string = $match[1];
                $full_shortcode = $match[0];
                
                $ids = array_map( 'intval', explode( ',', $ids_string ) );
                $ids = array_filter( $ids );
                
                $gallery_ids = implode( ',', $ids );
                $replacement = '[gallery ids="' . $gallery_ids . '"]';
                
                $content = str_replace( $full_shortcode, $replacement, $content );
                
                $details[] = [
                    'original' => $full_shortcode,
                    'gallery' => $gallery_ids
                ];
                
                $found++;
                $replaced++;
            }
        }
        
        if ( $content !== $original_content && ! $dry_run ) {
            wp_update_post( [ 'ID' => $post->ID, 'post_content' => $content ] );
            $posts_changed++;
        }
    }
    
    return [
        'found' => $found,
        'replaced' => $replaced,
        'posts' => $posts_changed,
        'details' => $details
    ];
}