$sql = "EXEC Sp_DetalleObservacion 5,'$fecinicio','$fecfin','$cboZona','$cboAgencia','$tipoobservacion','$Producto','' ";
$params = array('$t1','$t2','$t3','$t4','$t5','$t6','$t7','$t8');
$result = sqlsrv_query($conn, $sql, $params);
$column = ['Mes', 'Ex_Revisados', 'Ex_Observados'];
$rows = array();
while ($r = sqlsrv_fetch_array($result, SQLSRV_FETCH_NUMERIC)) {
$rows[] = $r;
}
array_unshift($rows, $column);
$jsonData = json_encode($rows, JSON_NUMERIC_CHECK);
}