paad/action/periodo_datos.php

<?
#input $_GET['id_espacio_sgu']
#output rutas: [ ...ruta, salones: [{...salon}] ]
header('Content-Type: application/json charset=utf-8');
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

$ruta = "../";
require_once $ruta . "class/c_login.php";

if (!isset($_SESSION['user'])) {
    http_response_code(401);
    die(json_encode(['error' => 'unauthorized']));
}
$user = unserialize($_SESSION['user']);
// check method
if ($_SERVER['REQUEST_METHOD'] !== 'GET') {
    http_response_code(405);
    die(json_encode(['error' => 'method not allowed']));
}

const JSON_OPTIONS = JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_PARTIAL_OUTPUT_ON_ERROR;
try {
    $data = $db->querySingle("SELECT *, LEAST(periodo_fecha_fin, CURRENT_DATE) as fecha_final FROM periodo WHERE periodo_id = ?", array($user->periodo_id));
    $last_query = [
        'query' => $db->getLastQuery(),
    ];

    echo json_encode($data, JSON_OPTIONS);
} catch (PDOException $th) {
    http_response_code(500);
    echo json_encode([
        'error' => $th->getMessage(),
        'query' => $db->getLastQuery(),
    ], JSON_OPTIONS);
    exit;
} catch (Exception $th) {
    http_response_code(500);
    echo json_encode([
        'error' => $th->getMessage(),
    ], JSON_OPTIONS);
    exit;
}