Available from version 1.13.0
Get cookies that should vary cache options
Define function:
public static function onGetCacheVaryCookies( $out, &$cookies ) { ... }
Attach hook: In extension.json:
	"Hooks": {
		"GetCacheVaryCookies": "MediaWiki\\Extension\\MyExtension\\Hooks::onGetCacheVaryCookies"
Called from: File(s): OutputPage.php
Interface: GetCacheVaryCookiesHook.php

For more information about attaching hooks, see Manual:Hooks .
For examples of extensions using this hook, see Category:GetCacheVaryCookies extensions.

Details edit

  • $out: OutputPage object
  • &$cookies: array of cookies name, add a value to it if you want to add a cookie that have to vary cache options