I want add an if to a php code when lang is changed to arabic in ACTIVE_LANG <html lang="<?= ACTIVE_LANG ?> select rtl css in the this code:<link rel="stylesheet" type="text/css" href="<?= active_theme_url()."/assets/css/plugins.css?v=".VERSION ?>">if active_lan="ar_AR" change plugins.css to plugins_rtl.css-----------------------------master code------------------
<?php if(!defined('APP_VERSION'))die("Yo, what's up?");?>
<!DOCTYPE html>
<html lang="
<?= ACTIVE_LANG ?>">

<head>

<metacharset="utf-8">

<metahttp-equiv="X-UA-Compatible"content="IE=edge">

<metaname="viewport"content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=0"/>

<metaname="theme-color"content="#fff">

<meta name="description" content="
<?= site_settings("site_description")?>">

<meta name="keywords" content="
<?= site_settings("site_keywords")?>">`

<link rel="icon" href="
<?= site_settings("logomark")? site_settings("logomark"): APPURL."/assets/img/logomark.png"?>" type="image/x-icon">

<link rel="shortcut icon" href="
<?= site_settings("logomark")? site_settings("logomark"): APPURL."/assets/img/logomark.png"?>" type="image/x-icon">

<link rel="stylesheet" type="text/css" href="
<?= active_theme_url()."/assets/css/plugins.css?v=".VERSION ?>">

<link rel="stylesheet" type="text/css" href="
<?= active_theme_url()."/assets/css/core.css?v=".VERSION ?>">

<title><?= site_settings("site_name")?></title>