+ // If string functions are overloaded, we need to use the mb versions
+ $this->is_overloaded = ((ini_get("mbstring.func_overload") & 2) != 0) && function_exists('mb_substr');
+ }
+
+ function _substr($string, $start, $length) {
+ if ($this->is_overloaded) {
+ return mb_substr($string,$start,$length,'ascii');
+ } else {
+ return substr($string,$start,$length);
+ }
+ }
+
+ function _strlen($string) {
+ if ($this->is_overloaded) {
+ return mb_strlen($string,'ascii');
+ } else {
+ return strlen($string);
+ }