From 22bf840f4b74c040296566871e253d0bb29eaf75 Mon Sep 17 00:00:00 2001
From: Sem <sembrestels@riseup.net>
Date: Tue, 30 Oct 2012 04:45:52 +0100
Subject: Added useragent language support.

---
 start.php | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/start.php b/start.php
index 2b9c4e543..a481c8877 100644
--- a/start.php
+++ b/start.php
@@ -4,6 +4,27 @@
  *
  */
 
+function languages_get_useragent_language() {
+	global $CONFIG;
+	if (isset($_SERVER["HTTP_ACCEPT_LANGUAGE"])) {
+
+		register_translations($CONFIG->path . "languages/", true);
+
+		$available_languages = array_keys($CONFIG->translations);
+		$accepted_languages = explode(',', $_SERVER["HTTP_ACCEPT_LANGUAGE"]);
+
+		foreach ($accepted_languages as $i => $accepted_language) {
+			$accepted_languages[$i] = trim(array_shift(preg_split("/[-;]/", $accepted_language)));
+		}
+
+		$langs = array_intersect($accepted_languages, $available_languages);
+		if (count($langs) > 0) {
+			return array_shift($langs);
+		}
+		return false;
+	}
+}
+
 register_translations(elgg_get_plugins_path() . "languages/languages/es", true);
 register_translations(elgg_get_plugins_path() . "languages/languages/nl", true);
 register_translations(elgg_get_plugins_path() . "languages/languages/de", true);
@@ -18,3 +39,10 @@ register_translations(elgg_get_plugins_path() . "languages/languages/ja", true);
 register_translations(elgg_get_plugins_path() . "languages/languages/sr", true);
 register_translations(elgg_get_plugins_path() . "languages/languages/th", true);
 register_translations(elgg_get_plugins_path() . "languages/languages/zh", true);
+
+if (!elgg_is_logged_in()) {
+	global $CONFIG;
+	if ($useragent_language = languages_get_useragent_language()) {
+		$CONFIG->language = $useragent_language;
+	}
+}
\ No newline at end of file
-- 
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