In what scenarios would using round() function in PHP be considered a workaround rather than a solution to calculation problems?

Using the round() function in PHP can be considered a workaround rather than a solution to calculation problems when dealing with floating point precision issues. This is because round() may not always produce the desired result due to how floating point numbers are represented in computers. To solve this issue, you can use the BC Math functions in PHP, such as bcmath_add(), bcmath_sub(), bcmath_mul(), and bcmath_div(), which provide arbitrary precision arithmetic.

// Using BC Math functions for arbitrary precision arithmetic
$number1 = '1.23456789';
$number2 = '9.87654321';

$sum = bcmath_add($number1, $number2);
$diff = bcmath_sub($number1, $number2);
$product = bcmath_mul($number1, $number2);
$quotient = bcmath_div($number1, $number2);

echo "Sum: $sum\n";
echo "Difference: $diff\n";
echo "Product: $product\n";
echo "Quotient: $quotient\n";