What are some common pitfalls to avoid when rounding values in PHP code?

One common pitfall to avoid when rounding values in PHP code is relying solely on the `round()` function without considering the rounding mode. This can lead to unexpected results due to the default rounding mode being "round half up". To ensure consistent rounding behavior, specify the desired rounding mode explicitly using the `round()` function.

// Incorrect way to round a value without specifying the rounding mode
$value = 10.5;
$rounded = round($value); // This will round to 11 due to default rounding mode

// Correct way to round a value with specified rounding mode
$value = 10.5;
$rounded = round($value, 0, PHP_ROUND_HALF_DOWN); // This will round to 10 using the "round half down" mode