add ajaxchat library - needs a lot of integration work to handle decentralisation (e.g. chatroom@website) and zotid w/permissions (e.g. ACL controlled chatrooms); we can also rip out a lot of stuff we don't need.

library/ajaxchat/chat/lib/class/AJAXChatString.php

@@ -0,0 +1,37 @@
+<?php
+/*
+ * @package AJAX_Chat
+ * @author Sebastian Tschan
+ * @copyright (c) Sebastian Tschan
+ * @license Modified MIT License
+ * @link https://blueimp.net/ajax/
+ */
+
+// Class to provide multibyte enabled string methods
+class AJAXChatString {
+
+	public static function subString($str, $start=0, $length=null, $encoding='UTF-8') {
+		if($length === null) {
+			$length = AJAXChatString::stringLength($str);
+		}		
+		if(function_exists('mb_substr')) {
+			return mb_substr($str, $start, $length, $encoding);
+		} else if(function_exists('iconv_substr')) {
+			return iconv_substr($str, $start, $length, $encoding);
+		} else {
+			return substr($str, $start, $length);
+		}
+	}
+	
+	public static function stringLength($str, $encoding='UTF-8') {
+		if(function_exists('mb_strlen')) {
+			return mb_strlen($str, $encoding);
+		} else if(function_exists('iconv_strlen')) {
+			return iconv_strlen($str, $encoding);
+		} else {
+			return strlen($str);
+		}
+	}
+
+}
+?>