Another correct methods its working fine: Cheers!!
$procedureName = 'VALIDATE_USER';$procedure = "CALL $procedureName('$username','$pwd',@p_userid)";$results1 = $dbconnection->query($procedure);$results2 = $dbconnection->query("SELECT @p_userid");$num_rows = $results2->num_rows;if ($num_rows > 0) { while($row = $results2->fetch_object()) { echo $row->{"@p_userid"}; }}