switch.php

<?php

$weekDay = 2;

switch ($weekDay) {
    case 1:
        echo "Lunes";
        break;
    case 2:
        echo "Martes";
        break;
    case 3:
        echo "Miércoles";
        break;
    case 4:
        echo "Jueves";
        break;
    case 5:
        echo "Viernes";
        break;
    case 6:
        echo "Sábado";
        break;
    case 7:
        echo "Domingo";
        break;
    default:
        echo 'No se ha encontrado el día';
        break;
}

// Martes