Php Draw Calendar - 5 days, 7 days

Sounds like a custom app.  There are many calendars available with a Google search.

See Practical Example #6 here:
https://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/A_201-Handling-date-and-time-in-PHP-and-MySQL.html

You've got 2 fundamental problems here:
Finding the start day(must be done first), and
looping through the remainder of the calendar days, based on user's selection.

There are plethora ways to find the start day, so I'll leave that up to you. :-)

Once you have the start day, if you wanted to display the days preceding the start day from the prior month, you'd need to determine the prior month, then how many days it has, then simply count backwards until you reach the start of the week.

The start of the week would be determined, of course, by the user's selection of 5 or 7 day weeks. However, you're still going to loop through every single day of the month; this is the easiest way to guarantee the date remains correct, regardless of layout.

If 5 day layout is chosen, you'd simply skip the weekend days.

Here's the easiest way I see it, in simple pseudo:

EndOfMonth = false;
myDate = 0;
TotalDays = getDaysOfMonth(currMonth);
while (!EndOfMonth) {
    foreach (weekday as day) {
        myDate++;
        if (myDate >= TotalDays) {EndOfMonth = true;}
        // Other stuff here, including check if 5-day layout on weekdays
    }
}

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There ya go! ^_^

Thank you. Tried tons of google searched calendars and none came even close to Full calendar! Awesome find.