+
+/**
+* returns querystring as string from a mapped array
+*
+* @param params Array
+* @return string
+*/
+function build_querystring($params, $name=null) {
+ $ret = "";
+ foreach($params as $key=>$val) {
+ if(is_array($val)) {
+ if($name==null) {
+ $ret .= build_querystring($val, $key);
+ } else {
+ $ret .= build_querystring($val, $name."[$key]");
+ }
+ } else {
+ $val = urlencode($val);
+ if($name!=null) {
+ $ret.=$name."[$key]"."=$val&";
+ } else {
+ $ret.= "$key=$val&";
+ }
+ }
+ }
+ return $ret;
+}