What potential pitfalls should be considered when working with varying numbers of days in different months in PHP?

When working with varying numbers of days in different months in PHP, one potential pitfall to consider is ensuring that your code accounts for the correct number of days in each month to avoid errors or unexpected behavior. One way to solve this issue is to use PHP's built-in functions like `date()` and `strtotime()` to accurately calculate the number of days in a given month.

// Get the number of days in a specific month
$month = 2; // February
$year = 2022;

$num_days = cal_days_in_month(CAL_GREGORIAN, $month, $year);
echo "Number of days in February 2022: " . $num_days;