static function process()
 {
     $errors = array();
     if (!isset($_POST["submit"])) {
         return $errors;
     }
     $errors = SolicitudEntregaConfirmController::validate();
     if (sizeof($errors) > 0) {
         return $errors;
     }
     $solicitudId = (int) substr($_POST["barcode"], 8, 8);
     SolicitudesEntregaAdmin::changeState($solicitudId, SolicitudEntregaState::entregada);
     return null;
 }
<?php

if (!isset($_SESSION)) {
    session_start();
}
$_SERVER["DOCUMENT_ROOT"] = $_SERVER["DOCUMENT_ROOT"] . '/turnos';
include_once $_SERVER["DOCUMENT_ROOT"] . '/common/Includes.php';
use controllers\SolicitudEntregaConfirmController;
$errors = SolicitudEntregaConfirmController::process();
?>

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