What are potential pitfalls when using the round() function in PHP for rounding numbers?

One potential pitfall when using the round() function in PHP is that it uses traditional rounding rules, which may not always produce the desired results for rounding halves. To address this issue, you can use the PHP_ROUND_HALF_UP constant as the second argument to the round() function to round halves up.

// Using PHP_ROUND_HALF_UP constant to round halves up
$number = 10.5;
$roundedNumber = round($number, 0, PHP_ROUND_HALF_UP);
echo $roundedNumber; // Output: 11