What is the usage of bcsub in PHP?

1 year ago
Isabella Edwards
1 minute

The bcsub function in PHP is used for performing subtraction calculations with arbitrary precision.

The syntax is as follows:
bcsub(string $left_operand, string $right_operand, int $scale = 0): string

Parameter explanation:

  1. $left_operand: The numerical value to be subtracted, represented as a string.
  2. $right_operand: The number to be subtracted from the right operand, represented as a string.
  3. $scale: Optional parameter that specifies the number of decimal places in the result, defaulting to 0.

Return value:

  1. Return the calculation result as a string.

Usage example:

$result = bcsub('10', '5'); // 结果为字符串"5"
$result = bcsub('3.14', '1.23', 2); // 结果为字符串"1.91"
$result = bcsub('1000', '200', 1); // 结果为字符串"800.0"

Attention:

  1. Both $left_operand and $right_operand parameters must be valid numeric strings, otherwise FALSE will be returned.
  2. If the $scale parameter is negative, it will be treated as 0.
  3. Since the bcsub function performs calculations with arbitrary precision, it can handle very large numerical values, but the calculation speed is relatively slow.
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