Initial commit.

lib/php/monica/xhtml.inc.php

@@ -0,0 +1,28 @@
+<?php
+// File name:	xhtml.inc.php
+// Description:	Extended PHP subroutine to read from/write to a file
+// Date:	2004-12-29
+// Author:	imacat <imacat@pristine.com.tw>
+// Copyright:	Copyright (C) 2004-2007 Pristine Communications
+
+// xhtml_content_type: Check whether application/xhtml+xml or text/html
+//   should be sent to the client
+function xhtml_content_type()
+{
+    // Browsers that claim to support application/xhtml+xml explicitly
+    if (    array_key_exists("HTTP_ACCEPT", $_SERVER)
+            && strpos($_SERVER["HTTP_ACCEPT"], "application/xhtml+xml") !== false) {
+        return "application/xhtml+xml";
+    }
+    // Browsers that are known to support application/xhtml+xml
+    if (array_key_exists("HTTP_USER_AGENT", $_SERVER)) {
+        // W3C validator can recognize application/xhtml+xml
+        if (substr($_SERVER["HTTP_USER_AGENT"], 0, 13) == "W3C_Validator") {
+            return "application/xhtml+xml";
+        }
+    }
+    // Else, we assume that application/xhtml+xml is not supported
+    return "text/html";
+}
+
+?>