gistfile1.txt

+/**
+ * Identify language from the Accept-language HTTP header we got.
+ * this is a simple copy from language_from_browser() in Drupal's language.inc.
+ * That one, unfortunately, discards any language that is not configured.
+ */
+function translatableregions_language_from_browser() {
+  // Specified by the user via the browser's Accept Language setting
+  // Samples: "hu, en-us;q=0.66, en;q=0.33", "hu,en-us;q=0.5"
+  $browser_langs = array();
+
+  if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
+    $browser_accept = explode(",", $_SERVER['HTTP_ACCEPT_LANGUAGE']);
+    for ($i = 0; $i < count($browser_accept); $i++) {
+      // The language part is either a code or a code with a quality.
+      // We cannot do anything with a * code, so it is skipped.
+      // If the quality is missing, it is assumed to be 1 according to the RFC.
+      if (preg_match("!([a-z-]+)(;q=([0-9\\.]+))?!", trim($browser_accept[$i]), $found)) {
+        $browser_langs[$found[1]] = (isset($found[3]) ? (float) $found[3] : 1.0);
+      }
+    }
+  }
+
+  $language = 'en'; // Default language.
+  if (!empty($browser_langs)) {
+    // Order the codes by quality
+    arsort($browser_langs);
+    $language = key($browser_langs);
+  }
+  return $language;
+
+}