function crearClaveDiaHora($dia, $hora, $sufijo){
$clave = str_replace(' ', '-', $dia).'-'.$hora.'-'.$sufijo;
return $clave;
}
function construirDefaults($semana){
$horas = ["00","01","02","03","04","05","06","07","08","09","10","11","12","13","14","15","16","17","18","19","20","21","22","23"];
$item = []; //nueva sintaxis
foreach ($semana as $dia) {
foreach($horas as $hora)
{
$item[ crearClaveDiaHora($dia, $hora, 'IC' ) ] = 0;