+ $dfrn_id = ((x($_POST,'dfrn_id')) ? $_POST['dfrn_id'] : '');
+ $challenge = ((x($_POST,'challenge')) ? $_POST['challenge'] : '');
+ $url = ((x($_POST,'url')) ? $_POST['url'] : '');
+ $dfrn_version = ((x($_POST,'dfrn_version')) ? (float) $_POST['dfrn_version'] : 0);
+
+ $direction = (-1);
+ if(strpos($dfrn_id,':') == 1) {
+ $direction = intval(substr($dfrn_id,0,1));
+ $dfrn_id = substr($dfrn_id,2);
+ }
+