What is the significance of using the `bcsub` function in PHP for subtraction operations involving floating point numbers?

When performing subtraction operations involving floating point numbers in PHP, using the `bcsub` function is significant because it provides precise calculations without the risk of losing accuracy due to floating point arithmetic issues. This function allows for arbitrary precision arithmetic, ensuring that the result of the subtraction operation is accurate and reliable. 

$num1 = '10.5';
$num2 = '3.2';

$result = bcsub($num1, $num2, 2);

echo $result; // Outputs: 7.3

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bcsub PHP floating point numbers subtraction significance

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