(PHP 4, PHP 5, PHP 7)
Subtract one arbitrary precision number from another
string bcsub ( string $left_operand, string $right_operand [, int $scale = 0 ] )
Subtracts the right_operand from the left_operand.
Parameters:
left_operand
The left operand, as a string.
right_operand
The right operand, as a string.
scale