Permalink update process by Polylang – Please explain

FrederikDussault
(@frederikdussault)

10 years, 10 months ago
Hello Chouby,

Still trying to understand how Polylang proceed.

As discussed ealier (https://ww.wp.xz.cn/support/topic/getting-language-from-path; https://ww.wp.xz.cn/support/topic/order-of-hookfilter-execution), I am trying to execute a code to switch language from an URL parameter lang.

I thought it was working but I was wrong. I really – and quickly – need to understand how Polylang is adding/replacing the language slug in permalink and how it tells worpress to reconsider the permalink.

NOTE: I am not concerned by rewrites anymore.

My URL: www.next.ca/dl?lang=fr
A rewrite rule:
```
function dl_rewrite_rules() {
	add_rewrite_rule(
		'dl.*',
		'index.php?pagename=dl',
		'top' );
}
add_action( 'init', 'dl_rewrite_rules' );
```
So far, I have this:

1) Polylang scans the URL and does not find a language code (en|fr), so it sets language to default (en) and fires “pll_language_defined”.

2) My function below is executed. It gets the lang parameter and if the lang parameter is present, changes the language by setting $polylang->curlang.
```
function detectDLPageLanguage() {
	//Hooked on PLL event, no need to check PLL existence
	//Over simplified code

	global $polylang;
        // $_GET['lang'] == 'en' or 'fr'
	$polylang->curlang = $polylang->model->get_language($_GET['lang']);
}
add_action('pll_language_defined', 'detectDLPageLanguage');
```
At this point, only the current language has changed.

What happens next?

My goal is to get the permalink to be modified from www.next.ca/dl?lang=fr to www.next.ca/fr/dl?lang=fr
but actualy does not. Whatever I do it simply goes to default language, www.next.ca/en/dl?lang=fr.

Is there extra instructions I should give Polylang to update the permalink according the updated $polylang->curlang?
Is there other hook(s) involved?

Please advise,
Thanks

https://ww.wp.xz.cn/plugins/polylang/

Viewing 5 replies - 1 through 5 (of 5 total)

Thread Starter FrederikDussault
(@frederikdussault)

10 years, 10 months ago
Extra information.

The following does not change the language slug neither.
```
function dl_switch_to_fr () {
	global $polylang;
	$polylang->curlang = $polylang->model->get_language( 'fr' );
}
add_action( 'pll_language_defined', 'dl_switch_to_fr', 0 );
```
It changes the current language but does not add /fr to the permalink.
Thread Starter FrederikDussault
(@frederikdussault)

10 years, 10 months ago
Chouby,

Another question.

In frontend.php, function parse_query.
```
$qv = $query->query_vars;
[..]
if (!empty($qv['lang'])) [...]
```
It seems you already have support for lang parameter.

Is this picking up the lang=fr in www.next.ca/dl?lang=fr ?
Thread Starter FrederikDussault
(@frederikdussault)

10 years, 10 months ago

Here are my setting is case you need them.

Polylang Settings:
Default language: en
URL modifications:
The language is set from the directory name in pretty permalinks
Example: http://next.localhost/en/my-post/
Remove /language/ in pretty permalinks
Example: http://next.localhost/en/
(Checked) The front page url contains the language code instead of the page name or page id
(Checked) When the front page is visited, set the language according to the browser preference

Permalink Settings
Day and name http://next.localhost/2015/07/27/sample-post/
Thread Starter FrederikDussault
(@frederikdussault)

10 years, 10 months ago
Sorry, I am adding and adding to the post.

I have found another portion of code that is looking to URL parameter lang presence:
```
abstract class PLL_Choose_Lang {
[..]
public function __construct(&$polylang) {
   [..]
   if (PLL_AJAX_ON_FRONT || false === stripos($_SERVER['SCRIPT_FILENAME'], 'index.php'))
      $this->set_language(empty($_REQUEST['lang']) ? $this->get_preferred_language() : $this->model->get_language($_REQUEST['lang']));
```
Does this mean it would be possible to get Polylang set the language based on the presence of lang parameter?

What would be missing in my setting (or code) to make it work?
Thread Starter FrederikDussault
(@frederikdussault)

10 years, 10 months ago

Okay, what about just using set_language()?

$polylang->set_language( $polylang->model->get_language($_REQUEST['lang']) ) would be good.

Do I understand correctly the following code of line prevents the permalink to be re-evaluate by the rewrite rules?
remove_action('wp', array(&$this, 'wp'), 5); // won't attempt to set the language a 2nd time

Viewing 5 replies - 1 through 5 (of 5 total)

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