Deprecated Class Property search_url used with Polylang

[stephaniecot]

Describe the bug
Since the most recent update of Polylang, the use of WP Rocket to clear the cache for all language throws a deprecated error from the get_rocket_i18n_uri() function. It uses the search_url property that is now deprecated. get_search_url() should be used instead.

To Reproduce
Steps to reproduce the behavior:

1. Clear the cache for all languages
2. The error should appear in de debug.log

[Tabrisrp]

Reproduce the issue ✅

Reproduced the issue on my local install

Identify the root cause ✅

Accessing the class property directly is deprecated since version 3.4, because the property is now private. getter method has been added instead.

Scope a solution ✅

We can resolve the issue by using the following:

$languages = $pll->model->get_languages_list();

			foreach ( $languages as $language ) {
				$urls[] = $language->get_home_url();
			}

but this is valid only starting from 3.4, because the getter method didn't exist before. So we will also need to add a conditional to use the previous code for the earlier versions, and the new one for 3.4 and higher.

Estimate the effort ✅

Effort XS