How to Determine Which Week of a Month a Given Day Belongs To?

Counting Weeks in a Month: Determining a Day's Week Number

Determining the week of a month for a specific day can be a tricky task. Here's a question about just that:

Question:

How can I determine which week of a month a given day belongs to, given the day as a format "YYYY-MM-DD" and the day on which the week rolls over?

Answer:

This intricate process involves a series of calculations:

1. Extract the month and year: Extract the first eight characters from the date string to determine the month and year, represented by "cut."
2. Convert date to timestamp: Convert the date to a timestamp using strtotime().
3. Calculate the first day of the month: Determine the first day of the month by setting the day portion to "00" and converting it to a timestamp using strtotime().
4. Compute elapsed days: Calculate the number of days elapsed since the first day of the month by subtracting the first day timestamp from the given date timestamp.
5. Initialize the week count: Set the week count to 1.
6. Iterate through elapsed days: Loop through each elapsed day.
7. Determine the weekday: Convert each elapsed day to a timestamp and determine the weekday using date("l").
8. Check for rollover day: If the weekday matches the specified rollover day, increment the week count.
9. Return the week count: Finally, return the week count after the loop ends.

Here's an example usage of the provided function:

echo getWeeks("2011-06-11", "sunday"); //outputs 2, for the second week of the month

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