# wplingua/2.12.2/wplingua.php

Translate and Go multilingual – Automatic AI translation – wpLingua, version 2.12.2. 420 lines.

- Page: https://pluginprobe.com/plugins/wplingua/2.12.2/code/wplingua.php
- Raw: https://pluginprobe.com/plugins/wplingua/2.12.2/raw/wplingua.php
- Modified: 2026-05-04T00:07:20+00:00

Line numbers below start at 1. Link to a line or a range by appending a fragment to the
page URL, for example `https://pluginprobe.com/plugins/wplingua/2.12.2/code/wplingua.php#L10-L20`.

```php
<?php
/**
 * Plugin Name: wpLingua
 * Plugin URI: https://wplingua.com/
 * Description: An all-in-one solution that makes your websites multilingual and translates them automatically, without word or page limits. The highlights: a free first language, an on-page visual editor for editing translations, a customizable language switcher, search engine optimization (SEO), self-hosted data and more!
 * Author: wpLingua Translation Service
 * Author URI: https://wplingua.com/
 * Text Domain: wplingua
 * Domain Path: /languages/
 * Version: 2.12.2
 * Requires PHP: 7.4
 * License: GPL v2 or later
 * License URI: https://www.gnu.org/licenses/gpl-2.0.html
 */


// If this file is called directly, abort.
if ( ! defined( 'WPINC' ) ) {
	die;
}


// Define wpLingua constants
define( 'WPLNG_API_URL', 'https://api.wplingua.com' );
define( 'WPLNG_API_VERSION', '3.0' );
define( 'WPLNG_API_SSLVERIFY', true );
define( 'WPLNG_PLUGIN_VERSION', '2.12.2' );
define( 'WPLNG_PLUGIN_FILE', plugin_basename( __FILE__ ) );
define( 'WPLNG_PLUGIN_DIR', __DIR__ );
define( 'WPLNG_CACHE_DIR', WP_CONTENT_DIR . '/wplingua-cache' );
define( 'WPLNG_PHP_MIN_VERSION', '7.4' );
define( 'WPLNG_MAX_TRANSLATIONS_STR', 220 );
define( 'WPLNG_MAX_TRANSLATIONS_CHAR', 4200 );
define( 'WPLNG_MAX_FILE_SIZE', 5000000 );


// Define debug constants
defined( 'WPLNG_DEBUG_JSON' ) || define( 'WPLNG_DEBUG_JSON', false );
defined( 'WPLNG_DEBUG_AJAX' ) || define( 'WPLNG_DEBUG_AJAX', false );
defined( 'WPLNG_DEBUG_REST' ) || define( 'WPLNG_DEBUG_REST', false );
defined( 'WPLNG_DEBUG_BEAT' ) || define( 'WPLNG_DEBUG_BEAT', false );
defined( 'WPLNG_DEBUG_XML' ) || define( 'WPLNG_DEBUG_XML', false );


// Load all needed PHP files
require_once WPLNG_PLUGIN_DIR . '/loader.php';


/**
 * Loads wpLingua plugin's translated strings.
 *
 * @return void
 */
function wplng_load_plugin_textdomain() {
	load_plugin_textdomain(
		'wplingua',
		false,
		'wplingua/languages'
	);
}


/**
 * Register all wpLingua Hook
 *
 * @return void
 */
function wplng_start() {

	// Setup $wplng_class_reload
	global $wplng_class_reload;
	$wplng_class_reload = false;

	// Setup $wplng_request_uri
	if ( isset( $_SERVER['REQUEST_URI'] ) ) {

		$request_uri = wp_unslash( (string) $_SERVER['REQUEST_URI'] );
		$request_uri = wplng_normalize_request_path( $request_uri );
		$decoded_uri = urldecode( $request_uri );

		// Check if the request URI is clean
		if ( strtolower( esc_url_raw( $request_uri ) ) !== strtolower( $request_uri )
			|| wplng_str_is_malicious( $request_uri )
			|| wplng_str_is_malicious( $decoded_uri )
		) {
			return;
		}

		// Also check query string for double-encoded attacks
		if ( isset( $_SERVER['QUERY_STRING'] ) ) {
			$query_string  = sanitize_text_field( $_SERVER['QUERY_STRING'] );
			$decoded_query = urldecode( urldecode( $query_string ) );

			if ( wplng_str_is_malicious( $decoded_query ) ) {
				return;
			}
		}

		global $wplng_request_uri;
		$wplng_request_uri = $request_uri;
	}

	// The plugin version has changed
	if ( get_option( 'wplng_version' ) !== WPLNG_PLUGIN_VERSION ) {
		update_option( 'wplng_version', WPLNG_PLUGIN_VERSION, true );
		wplng_clear_translations_cache();
		wplng_clear_slugs_cache();
		wplng_clear_folder_cache();
	}

	// Load plugin text domain /languages/
	add_action( 'init', 'wplng_load_plugin_textdomain' );

	// Do not cache page for connected editor
	add_action( 'init', 'wplng_init_manage_cache', 1 );

	// Display a notice if incompatibility is detected
	add_action( 'admin_notices', 'wplng_admin_notice_incompatible_plugin', 1 );
	add_action( 'admin_notices', 'wplng_admin_notice_incompatible_multisite', 1 );
	add_action( 'admin_notices', 'wplng_admin_notice_incompatible_php_version', 1 );
	add_action( 'admin_notices', 'wplng_admin_notice_incompatible_htaccess', 1 );
	add_action( 'admin_notices', 'wplng_admin_notice_incompatible_plain_permalink', 1 );

	// Return if incompatibility is detected
	if ( ! empty( wplng_get_incompatible_plugins() )
		|| is_multisite()
		|| ( version_compare( PHP_VERSION, WPLNG_PHP_MIN_VERSION ) < 0 )
		|| ! wplng_htaccess_is_valid()
		|| empty( get_option( 'permalink_structure' ) )
	) {
		return;
	}

	// Register plugin settings
	add_action( 'admin_init', 'wplng_register_settings' );

	// Add settings link in plugin list
	add_filter( 'plugin_action_links_' . WPLNG_PLUGIN_FILE, 'wplng_settings_link' );

	// Redirect to the settings page on plugin activation
	add_action( 'activated_plugin', 'wplng_plugin_activation_redirect' );

	// Set footer text for options pages
	add_filter( 'admin_footer_text', 'wplng_admin_footer_text', 11 );
	add_filter( 'update_footer', 'wplng_update_footer', 11 );

	// Print head script (JSON with all languages informations)
	add_action( 'toplevel_page_wplingua-settings', 'wplng_inline_script_languages' );

	if ( empty( wplng_get_api_data() ) ) {

		// Add Register option page in back office menu
		add_action( 'admin_menu', 'wplng_create_menu_register' );

		// Enqueue CSS and JS files for register option pages
		add_action( 'admin_enqueue_scripts', 'wplng_option_page_register_assets' );

		// Display a notice if the plugin is activate but not configured
		add_action( 'admin_notices', 'wplng_admin_notice_no_key_set', 1 );

	} else {

		/**
		 * Back office
		 */

		// Add menu in back office
		add_action( 'admin_menu', 'wplng_create_menu' );

		// Add admin Bar menu
		add_action( 'admin_bar_menu', 'wplng_admin_bar_menu', 81 );
		add_action( 'admin_bar_menu', 'wplng_admin_bar_edit', 81 );

		// Switcher in nav menu options
		add_action( 'admin_enqueue_scripts', 'wplng_switcher_nav_menu_inline_scripts' );
		add_action( 'admin_head-nav-menus.php', 'wp_nav_menu_switcher_box_add_register' );
		add_action( 'wp_nav_menu_item_custom_fields', 'wp_nav_menu_switcher_box_edit', 10, 2 );

		// Enqueue CSS and JS files for option pages
		add_action( 'admin_enqueue_scripts', 'wplng_option_page_settings_assets' );
		add_action( 'admin_enqueue_scripts', 'wplng_option_page_switcher_assets' );
		add_action( 'admin_enqueue_scripts', 'wplng_option_page_exclusions_assets' );
		add_action( 'admin_enqueue_scripts', 'wplng_option_page_dictionary_assets' );
		add_action( 'admin_enqueue_scripts', 'wplng_option_page_link_media_assets' );

		// Update flags URL
		add_action( 'update_option_wplng_flags_style', 'wplng_options_switcher_update_flags_style', 10, 2 );

		// Reset API data on API key changing
		add_action( 'update_option_wplng_api_key', 'wplng_on_update_option_wplng_api_key', 10, 2 );

		// Add edit link on page and post list
		add_filter( 'page_row_actions', 'wplng_row_edit_translation_link', 10, 2 );
		add_filter( 'post_row_actions', 'wplng_row_edit_translation_link', 10, 2 );

		/**
		 * wplng_translation : CPT, taxo, meta
		 */

		// Register wplng_translation CPT
		add_action( 'init', 'wplng_register_post_type_translation' );

		// Add metabox for wplng_translation
		add_action( 'add_meta_boxes_wplng_translation', 'wplng_translation_add_meta_box' );

		// Save metabox on posts saving
		add_action( 'save_post_wplng_translation', 'wplng_translation_save_meta_boxes_data', 10, 2 );

		// Clear translation cache on trash / untrash
		add_action( 'trashed_post', 'wplng_clear_translations_cache_trash_untrash' );
		add_action( 'untrash_post', 'wplng_clear_translations_cache_trash_untrash' );
		add_action( 'delete_post', 'wplng_clear_translations_cache_trash_untrash' );

		// Enqueue Script for wplng_translation admin: Edit
		add_action( 'admin_print_scripts-post.php', 'wplng_translation_edit_assets' );

		// Enqueue Script for wplng_translation admin: List
		add_action( 'admin_print_scripts-edit.php', 'wplng_translation_list_assets' );

		// Only show translations for the website languages
		add_action( 'pre_get_posts', 'wplng_filter_wplng_translation_posts' );

		// Remove Quick edit from translations list
		add_filter( 'post_row_actions', 'wplng_translation_remove_quick_edit', 10, 2 );

		// Ajax function for regenerate translation on edit page
		add_action( 'wp_ajax_wplng_ajax_translation', 'wplng_ajax_generate_translation' );

		// Ajax function for edit modal: Get HTML modal
		add_action( 'wp_ajax_wplng_ajax_edit_modal', 'wplng_ajax_edit_modal' );

		// Ajax function for edit modal: Save modal
		add_action( 'wp_ajax_wplng_ajax_save_modal', 'wplng_ajax_save_modal' );

		// Ajax function for edit modal: HeartBeat
		add_action( 'wp_ajax_wplng_ajax_heartbeat', 'wplng_ajax_heartbeat' );
		add_action( 'wp_ajax_nopriv_wplng_ajax_heartbeat', 'wplng_ajax_heartbeat' );

		// Display 100 translation in admin area by default
		add_filter( 'get_user_option_edit_wplng_translation_per_page', 'wplng_translation_per_page' );

		// Filter translations by status
		add_action( 'restrict_manage_posts', 'wplng_restrict_manage_posts_translation_status' );
		add_filter( 'parse_query', 'wplng_posts_filter_translation_status' );

		// Translation status on website translations list
		add_filter( 'post_class', 'wplng_post_class_translation_status', 10, 3 );
		add_filter( 'post_row_actions', 'wplng_post_row_actions_translation_status', 10, 2 );
		add_filter( 'manage_wplng_translation_posts_columns', 'wplng_translation_status_columns' );
		add_action( 'manage_wplng_translation_posts_custom_column', 'wplng_translation_status_item', 10, 2 );

		/**
		 * wplng_slug : CPT, taxo, meta
		 */

		// Register wplng_translation CPT
		add_action( 'init', 'wplng_register_post_type_slug' );

		// Add metabox for wplng_slug
		add_action( 'add_meta_boxes_wplng_slug', 'wplng_slug_add_meta_box' );

		// Save metabox on posts saving
		add_action( 'save_post_wplng_slug', 'wplng_slug_save_meta_boxes_data', 10, 2 );

		// Clear slugs cache on trash / untrash
		add_action( 'trashed_post', 'wplng_clear_slugs_cache_trash_untrash' );
		add_action( 'untrash_post', 'wplng_clear_slugs_cache_trash_untrash' );
		add_action( 'delete_post', 'wplng_clear_slugs_cache_trash_untrash' );

		// Enqueue Script for wplng_slug admin: Edit
		add_action( 'admin_print_scripts-post.php', 'wplng_slug_edit_assets' );

		// Enqueue Script for wplng_slug admin: List
		add_action( 'admin_print_scripts-edit.php', 'wplng_slug_list_assets' );

		// Only show slugs for the website languages
		add_action( 'pre_get_posts', 'wplng_filter_wplng_slug_posts' );

		// Remove Quick edit from slugs list
		add_filter( 'post_row_actions', 'wplng_slug_remove_quick_edit', 10, 2 );

		// Ajax function for regenerate slug on edit page
		add_action( 'wp_ajax_wplng_ajax_slug', 'wplng_ajax_generate_slug' );

		// Display 100 translation in admin area by default
		add_filter( 'get_user_option_edit_wplng_slug_per_page', 'wplng_slug_per_page' );

		// Filter slugs by status
		add_action( 'restrict_manage_posts', 'wplng_restrict_manage_posts_slug_status' );
		add_filter( 'parse_query', 'wplng_posts_filter_slug_status' );

		// Translation status on website slugs list
		add_filter( 'post_class', 'wplng_post_class_slug_status', 10, 3 );
		add_filter( 'post_row_actions', 'wplng_post_row_actions_slug_status', 10, 2 );
		add_filter( 'manage_wplng_slug_posts_columns', 'wplng_slug_status_columns' );
		add_action( 'manage_wplng_slug_posts_custom_column', 'wplng_slug_status_item', 10, 2 );

		/**
		 * Front
		 */

		// Enqueue CSS and JS files
		add_action( 'wp_enqueue_scripts', 'wplng_register_assets' );

		// Add custom inline styles (option page: switcher)
		add_action( 'wp_head', 'wplng_add_custom_inline_styles', 50 );

		// Script JS in page
		add_action( 'wp_footer', 'wplng_on_page_script' );

		// Add languages switcher before </body>
		add_action( 'wp_footer', 'wplng_switcher_wp_footer' );

		// Add languages switcher in nav menu
		add_filter( 'wp_nav_menu_objects', 'wplng_switcher_nav_menu_replace_items' );
		add_filter( 'nav_menu_link_attributes', 'wplng_add_nav_menu_link_attributes_atts', 10, 2 );

		// Set alternate links with hreflang parametters
		add_action( 'wp_head', 'wplng_link_alternate_hreflang', 1 );

		// Disable web browser automatic translation
		add_action( 'language_attributes', 'wplng_disable_web_browser_auto_translate' );

		// Ajax function for Load in progress
		add_action( 'wp_ajax_wplng_load_in_progress', 'wplng_ajax_load_in_progress' );

		/**
		 * OB and REQUEST_URI
		 */

		// Manage URL with REQUEST_URI and start OB
		add_action( 'init', 'wplng_ob_start', 1 );

		// Redirect page if is called with an untranslate slug
		add_action( 'template_redirect', 'wplng_redirect_translated_slug' );

		/**
		 * Generate JSON translation on the fly for wp-i18n.js
		 */

		// Generate JSON translation
		add_filter( 'load_script_translation_file', 'wplng_load_script_translation_file', 20, 3 );

		/**
		 * Clear wpLingua cache on updates
		 */

		// Clear wpLingua cache on WordPress core, plugins, themes or translations update
		add_action( 'upgrader_process_complete', 'wplng_clear_cache_on_update', 10, 2 );

		// Clear wpLingua cache on plugin activation/deactivation
		add_action( 'activated_plugin', 'wplng_clear_folder_cache' );
		add_action( 'deactivated_plugin', 'wplng_clear_folder_cache' );

		// Clear wpLingua cache on theme switch
		add_action( 'switch_theme', 'wplng_clear_folder_cache' );

		// Clear wpLingua cache on site language change
		add_action( 'update_option_WPLANG', 'wplng_clear_folder_cache' );

		// Clear wpLingua cache on wpLingua settings change
		add_action( 'update_option_wplng_website_language', 'wplng_clear_folder_cache' );
		add_action( 'update_option_wplng_target_languages', 'wplng_clear_folder_cache' );

		/**
		 * Features
		 */

		// Make multilingua Sitemap XML for All In One SEO plugin
		// Il other case, multilingual Sitemap is make by output buffering
		if ( get_option( 'wplng_sitemap_xml', true )
			&& function_exists( 'aioseo' )
		) {
			add_filter( 'aioseo_sitemap_post', 'wplng_aioseo_filter_sitemap_post', 10, 2 );
			add_filter( 'aioseo_sitemap_term', 'wplng_aioseo_filter_sitemap_term', 10, 2 );
		}

		// Search from translated languages
		if ( ! empty( get_option( 'wplng_translate_search' ) )
			&& wplng_api_feature_is_allow( 'search' )
		) {
			add_action( 'parse_query', 'wplng_translate_search_query' );
		} else {
			add_filter( 'wplng_url_is_translatable', 'wplng_exclude_search', 20 );
		}

		// Redirect by browser language
		$browser_language_redirect = get_option( 'wplng_browser_language_redirect' );
		if ( $browser_language_redirect === 'js_only' ) {
			add_action( 'wp_head', 'wplng_browser_language_redirect_js_only', 2 );
		} elseif ( $browser_language_redirect === 'php_js' ) {
			add_action( 'template_redirect', 'wplng_browser_language_redirect_php_js' );
		}

		/**
		 * Shortcode
		 */

		add_shortcode( 'wplng_switcher', 'wplng_shortcode_switcher' );
		add_shortcode( 'wplng_notranslate', 'wplng_shortcode_notranslate' );
		add_shortcode( 'wplng_only', 'wplng_shortcode_only' );

		/**
		 * Gutenberg
		 */

		add_filter( 'block_categories_all', 'wplng_block_category' );
		add_action( 'init', 'wplng_register_block' );
		add_action( 'enqueue_block_editor_assets', 'wplng_register_block_assets' );

		/**
		 * Do action after wpLingua fully initialized
		 */

		do_action( 'wplng_initialized' );

	}
}
wplng_start();

```