ช่วยด้วยครับ Error Query [SELECT SQL_CALC_FOUND_ROWS * from Tblname WHERE gender = '$gender' DESC limit 15]

$db-new mysqli( 'localhost', 'test', 'test', 'test');
$rs = $db->query("SELECT SQL_CALC_FOUND_ROWS * FROM test WHERE 1 LIMIT 10");
$rs_count = $db->query("SELECT FOUND_ROWS()");
list($all_row) = $rs_count->fetch_row();
echo "Table [test] found all rows = $all_row ";