<?php
// Method 1: Using wp_redirect() in functions.php
function custom_page_redirects() {
    if (is_page('old-page-slug')) {
        wp_redirect(home_url('/new-page/'), 301);
        exit();
    }
    
    // Redirect old category to new category
    if (is_category('old-category-slug')) {
        wp_redirect(home_url('/category/new-category/'), 301);
        exit();
    }
}
add_action('template_redirect', 'custom_page_redirects');

// Method 2: Redirect based on URL structure
function legacy_url_redirects() {
    $request_uri = $_SERVER['REQUEST_URI'];
    
    // Old blog structure: /2023/01/post-name/ → /blog/post-name/
    if (preg_match('/^\/(\d{4})\/(\d{2})\/(.+)\/$/', $request_uri, $matches)) {
        $post_slug = $matches[3];
        wp_redirect(home_url('/blog/' . $post_slug . '/'), 301);
        exit();
    }
}
add_action('init', 'legacy_url_redirects');
?>

<?php
// Hook into WordPress query to handle redirects
function handle_custom_redirects() {
    global $wp_query;
    
    // Redirect 404 pages that match certain patterns
    if (is_404()) {
        $request_uri = $_SERVER['REQUEST_URI'];
        
        // Check if it's an old product URL
        if (preg_match('/^\/products\/old-(.+)\/$/', $request_uri, $matches)) {
            $product_slug = $matches[1];
            wp_redirect(home_url('/shop/' . $product_slug . '/'), 301);
            exit();
        }
    }
}
add_action('wp', 'handle_custom_redirects');

// Redirect based on post type
function redirect_old_post_types() {
    if (is_singular('old_post_type')) {
        global $post;
        $new_url = home_url('/new-section/' . $post->post_name . '/');
        wp_redirect($new_url, 301);
        exit();
    }
}
add_action('template_redirect', 'redirect_old_post_types');
?>

# Joomla .htaccess redirect examples
# Add these to your Joomla .htaccess file

# Redirect old articles to new structure
RewriteRule ^old-section/([^/]+)/?$ /new-section/$1 [R=301,L]

# Redirect old component URLs
RewriteRule ^component/content/article/([0-9]+)/?$ /articles/$1 [R=301,L]

# Drupal 8/9/10 redirect module usage

# 1. Install Redirect module
composer require drupal/redirect

# 2. Enable module
drush en redirect

# 3. Create redirects programmatically
$redirect = Redirect::create([
  'redirect_source' => 'old-path',
  'redirect_redirect' => 'internal:/new-path',
  'language' => 'und',
  'status_code' => 301,
]);
$redirect->save();

# Bitrix .htaccess redirect configuration
RewriteEngine On

# Bitrix-specific redirects
RewriteCond %{HTTP_HOST} ^old-domain\.com$ [NC]
RewriteRule ^(.*)$ https://new-domain.com/$1 [R=301,L]

# Bitrix component redirects
RewriteRule ^old-catalog/(.*)$ /catalog/$1 [R=301,L]

Redirect from,Redirect to
/old-product,/collections/new-products/products/new-product
/old-collection,/collections/new-collection
/old-page,/pages/new-page

<?php
// WooCommerce-specific redirects in functions.php

// Redirect old product URLs
function woocommerce_custom_redirects() {
    if (is_product()) {
        global $post;
        
        // Redirect old product structure
        if (strpos($_SERVER['REQUEST_URI'], '/old-products/') !== false) {
            $new_url = str_replace('/old-products/', '/shop/', $_SERVER['REQUEST_URI']);
            wp_redirect(home_url($new_url), 301);
            exit();
        }
    }
}
add_action('template_redirect', 'woocommerce_custom_redirects');

// Redirect old shop categories
function redirect_old_product_categories() {
    if (is_product_category()) {
        $category = get_queried_object();
        
        if ($category->slug === 'old-category-slug') {
            wp_redirect(home_url('/product-category/new-category-slug/'), 301);
            exit();
        }
    }
}
add_action('template_redirect', 'redirect_old_product_categories');
?>

# Magento 2 redirect configuration

# 1. Admin panel redirects
Admin Panel → Marketing → SEO & Search → URL Rewrites

# 2. Programmatic redirects in app/code
<?php
namespace Vendor\Module\Controller\Index;

use Magento\Framework\App\Action\Action;
use Magento\Framework\App\Action\Context;
use Magento\Framework\Controller\Result\RedirectFactory;

class Redirect extends Action
{
    protected $redirectFactory;
    
    public function __construct(Context $context, RedirectFactory $redirectFactory)
    {
        $this->redirectFactory = $redirectFactory;
        parent::__construct($context);
    }
    
    public function execute()
    {
        $redirect = $this->redirectFactory->create();
        return $redirect->setUrl('/new-url')->setHttpResponseCode(301);
    }
}
?>

# OpenCart .htaccess redirects
RewriteEngine On

# Old product URLs to new structure
RewriteRule ^product/([0-9]+)/?$ /index.php?route=product/product&product_id=$1 [R=301,L]

# Old category URLs
RewriteRule ^old-category/?$ /new-category [R=301,L]