Note that it is almost useless to put a integer higher than 6 maybe 7 in the scale parameter.
In some cases this might be needed. But for the simple souls, more than 4 is not required in most of the time.
(PHP 4, PHP 5, PHP 7)
bcsub — Subtract one arbitrary precision number from another
$left_operand
, string $right_operand
[, int $scale = 0
] )
Subtracts the right_operand from the
left_operand.
left_operandThe left operand, as a string.
right_operandThe right operand, as a string.
scaleThis optional parameter is used to set the number of digits after the decimal place in the result. If omitted, it will default to the scale set globally with the bcscale() function, or fallback to 0 if this has not been set.
The result of the subtraction, as a string.
Example #1 bcsub() example
<?php
$a = '1.234';
$b = '5';
echo bcsub($a, $b); // -3
echo bcsub($a, $b, 4); // -3.7660
?>
Note that it is almost useless to put a integer higher than 6 maybe 7 in the scale parameter.
In some cases this might be needed. But for the simple souls, more than 4 is not required in most of the time.