How can PHP developers efficiently handle cases where certain days have no scheduled training or opening hours?

To efficiently handle cases where certain days have no scheduled training or opening hours, PHP developers can create a function that checks if the current day is in a list of days with special schedules. If the current day is in the list, the function can display a message indicating that there are no scheduled activities for that day.

function checkSpecialSchedule($specialDays){
    $currentDay = date('l');
    
    if(in_array($currentDay, $specialDays)){
        echo "There are no scheduled activities for today.";
    } else {
        // Display regular schedule
    }
}

// Example of usage
$specialDays = ['Saturday', 'Sunday'];
checkSpecialSchedule($specialDays);