# polylang/trunk/polylang.php

Polylang, version trunk. 108 lines.

- Page: https://pluginprobe.com/plugins/polylang/trunk/code/polylang.php
- Raw: https://pluginprobe.com/plugins/polylang/trunk/raw/polylang.php
- Modified: 2026-09-28T09:50:00+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/polylang/trunk/code/polylang.php#L10-L20`.

```php
<?php
/**
 * Polylang
 *
 * @package           Polylang
 * @author            WP SYNTEX
 * @license           GPL-3.0-or-later
 *
 * @wordpress-plugin
 * Plugin Name:       Polylang
 * Plugin URI:        https://polylang.pro
 * Description:       Adds multilingual capability to WordPress
 * Version:           3.9-beta2
 * Requires at least: 6.8
 * Requires PHP:      7.4
 * Author:            WP SYNTEX
 * Author URI:        https://polylang.pro
 * Text Domain:       polylang
 * License:           GPL v3 or later
 * License URI:       https://www.gnu.org/licenses/gpl-3.0.txt
 *
 * Copyright 2011-2019 Frédéric Demarle
 * Copyright 2019-2026 WP SYNTEX
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 */

defined( 'ABSPATH' ) || exit;

if ( defined( 'POLYLANG_VERSION' ) ) {
	// The user is attempting to activate a second plugin instance, typically Polylang and Polylang Pro.
	require_once ABSPATH . 'wp-admin/includes/plugin.php';

	if ( is_plugin_active( plugin_basename( __FILE__ ) ) ) {
		deactivate_plugins( plugin_basename( __FILE__ ) ); // Deactivate this plugin.

		add_action(
			'load-plugins.php',
			static function () {
				unset( $_GET['activate'] ); // Prevent WP to display its 'Plugin activated.' message.
				$updated_notice_args = array(
					'type'        => 'error',
					'dismissible' => true,
				);
				wp_admin_notice( __( 'Polylang hasn\'t been activated: Polylang and Polylang Pro cannot be activated at the same time.', 'polylang' ), $updated_notice_args );
			}
		);
	}
	return;
}

// Go on loading the plugin.
define( 'POLYLANG_VERSION', '3.9-beta2' );
define( 'PLL_MIN_WP_VERSION', '6.8' );
define( 'PLL_MIN_PHP_VERSION', '7.4' );

define( 'POLYLANG_FILE', __FILE__ );
define( 'POLYLANG_DIR', __DIR__ );

// The filename of the plugin in use, whether it is Polylang or Polylang Pro.
if ( ! defined( 'POLYLANG_ROOT_FILE' ) ) {
	define( 'POLYLANG_ROOT_FILE', __FILE__ );
}

// The root directory of the plugin in use, whether it is Polylang or Polylang Pro.
if ( ! defined( 'POLYLANG_ROOT_DIR' ) ) {
	define( 'POLYLANG_ROOT_DIR', __DIR__ );
}

if ( ! defined( 'POLYLANG_BASENAME' ) ) {
	define( 'POLYLANG_BASENAME', plugin_basename( __FILE__ ) ); // Plugin name as known by WP.
	require __DIR__ . '/vendor/autoload.php';
}

define( 'POLYLANG', ucwords( str_replace( '-', ' ', dirname( POLYLANG_BASENAME ) ) ) );

if ( ! empty( $_GET['deactivate-polylang'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification
	return;
}

require POLYLANG_DIR . '/src/constant-functions.php';
if ( ! PLL_Usable::can_activate() ) {
	// WP version or php version is too old.
	return;
}

define( 'POLYLANG_ACTIVE', true );

if ( PLL_Deactivate::is_deactivation() ) {
	// Stopping here if we are going to deactivate the plugin (avoids breaking rewrite rules).
	PLL_Deactivate::add_hooks();
	return;
}

PLL_Activate::add_hooks();
new Polylang();

```