<?php
// Method that checks whether the current day of week is either Saturday or Sunday using Joomla API
function isWeekend()
{
    // Comma separated list of days to check. Sunday = 7
    $allowDays = array(6,7);

    // Do not edit below
    return in_array(JFactory::getDate()->format('N'), $allowDays);
}

// Call method
if (isWeekend())
{
    echo 'Hooray! is weekend!';
}
?>