$stmt = $conn->prepare(SELECT A.TOTAL, A.Dia, Turno

FROM
(SELECT (COUNT(tarefa)/1020) * 100 AS TOTAL, DAY(IniciarTarefa) AS Dia, DATE(IniciarTarefa) AS DataInicio FROM raddb.Tarefa LEFT OUTER JOIN raddb.TipoTarefa

ON raddb.TipoTarefa.Id = raddb.Tarefa.tarefa

WHERE TipoTarefa IN ('2', '3') AND DATE_FORMAT(IniciarTarefa, '%H:%i:%S') >= '07:00:00' AND DATE_FORMAT(FimTarefa, '%H:%i:%S') <= '14:00:00' AND
      MONTH(FimTarefa) = EXTRACT(MONTH FROM CURDATE() - INTERVAL 0 MONTH)

GROUP BY MONTH(FimTarefa), DAY(FimTarefa), DAY(IniciarTarefa), DATE(IniciarTarefa)) AS A LEFT OUTER JOIN raddb.sessoes ON DATE(data) = A.DataInicio

WHERE Turno = 'M' ORDER BY A.TOTAL DESC LIMIT 5");

$stmt->execute();
$json = [];

while($row=$stmt->fetch(PDO::FETCH_ASSOC)){
    extract($row);
    $json[]= [(string)$Turno, (int)$TOTAL];
}
echo json_encode($json);