PHP5中文手册·Subtract one arbitrary precision number from another -- 追寻梦想＞编程乐园＞PHP 编程

string bcsub ( string $left_operand , string $right_operand [, int $scale ] )

Subtracts the right_operand from the left_operand .

left_operand: The left operand, as a string.
right_operand: The right operand, as a string.
scale: This optional parameter is used to set the number of digits after the decimal place in the result. You can also set the global default scale for all functions by using bcscale().

The result of the substraction, 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

?>


	PHP5中文手册 BC math bcompiler BC math PHP Manual bcsub (PHP 4, PHP 5) bcsub — Subtract one arbitrary precision number from another 说明 string bcsub ( string `$left_operand` , string `$right_operand` [, int `$scale` ] ) Subtracts the `right_operand` from the `left_operand` . 参数 `left_operand` The left operand, as a string. `right_operand` The right operand, as a string. `scale` This optional parameter is used to set the number of digits after the decimal place in the result. You can also set the global default scale for all functions by using bcscale(). 返回值 The result of the substraction, as a string. 范例 Example#1 bcsub() example `<?php $a = '1.234'; $b = '5'; echo bcsub($a, $b); // -3 echo bcsub($a, $b, 4); // -3.7660 ?>` 参见 bcadd() BC math bcompiler BC math PHP Manual