(PHP 4, PHP 5)
bcmul — Multiply two arbitrary precision number
Multiply the left_operand by the right_operand.
The left operand, as a string.
The right operand, as a string.
此可选参数用于设置结果中小数点后的小数位数。 也可通过使用 bcscale() 来设置全局默认的小数位数，用于所有函数。
Returns the result as a string.
Example #1 bcmul() example
<?php
echo bcmul('1.34747474747', '35', 3); // 47.161
echo bcmul('2', '4'); // 8
?>