synchronizing user preference and browser history

An example of this is when a user needs to read a webpage in his / her own native language. He / she may change this with a click of a button and page will redirect to a proper page.

From my point of view, this can be implemented in following way:

First, webpages / contents for a language should be organized in a specific directory, and other languages in other separate directories. For example, if we have pages in English, Indonesian and German, we should create 3 directories to store pages as follows:
- /en
- /id
- /de
Secondly, save user preference as a session variable,

Third, create a redirector redir.php below to set that session variable:

<?php
	session_start();
	
	if($_SERVER['REQUEST_METHOD'] == 'GET' && isset($_GET['lang']){
		$_SESSION['lang'] = $_GET['lang'];
		
		if($_SESSION['lang'] === 'en')
			header('Location: /' . $_GET['page']);
		elseif($_SESSION['lang'] === 'id')
			header('Location: /id/' . $_GET['page']);
		elseif($_SESSION['lang'] === 'de')
			header('Location: /de/' . $_GET['page']);
	}
?>

User may change language with a click to an anchor link to get Indonesian version of a page like: <a href="/redir.php?lang=id&page=<?php echo basename($_SERVER['SCRIPT_NAME']);?>

Problem arises however when that user (accidentally / not) goes back to previous page via browser's history back button. User does get back to an English page but his / her preference is still Indonesian, correct?

To handle this, each pages (in any languages) must be preceded with following code:

<?php
	session_start();
		
	if(!isset($_SESSION['lang'])) //set default language to English 
		$_SESSION['lang'] = 'en';
	
	/*requested page (sub folder) may be different than selected language recorded by session, 
		as user clicks browser back button. in such case, perform redirection to proper page based on language.*/
	$page = basename($_SERVER['SCRIPT_NAME']);
	$subdir = ltrim(dirname($_SERVER['SCRIPT_NAME']), '/');
	if( ($_SESSION['lang'] == 'en' && $subdir != '') ||
		($_SESSION['lang'] == 'id' && $subdir != 'id') ||
		($_SESSION['lang'] == 'de' && $subdir != 'de')){
		header('Location: /redir.php?lang='. $_SESSION['lang']. '&page=' . $page);
		exit;
	}
?>
<!DOCTYPE html>
<html lang="<?php echo $_SESSION['lang'];?>">
	<head>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, initial-scale=1.0">

Hopefully I'll have sometime to make a demo of this. To be continued then :)

Comments

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Thank you for your input.

I do try to put images e.g. diagrams, charts, etc whenever possible,
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No:) the real reason is because I prefer to keep site to be lightweight, and more of a text-based website.

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Synchronizing user preference and browser history

Comments