=====bcadd — 2个任意精度数字的加法计算=====
<?php $a = '1.234'; $b = '5'; echo bcadd($a, $b); // 6 echo bcadd($a, $b, 4); // 6.2340 ?>=====bccomp — 比较两个任意精度的数字=====
<?php echo bccomp('1', '2') . "\n"; // -1 echo bccomp('1.00001', '1', 3); // 0 echo bccomp('1.00001', '1', 5); // 1 ?>=====bcdiv — 2个任意精度的数字除法计算=====
<?php echo bcdiv('105', '6.55957', 3); // 16.007 ?>=====bcmod — 对一个任意精度数字取模=====
<?php echo bcmod('4', '2'); // 0 echo bcmod('2', '4'); // 2 ?>=====bcmul — 2个任意精度数字乘法计算=====
<?php echo bcmul('1.34747474747', '35', 3); // 47.161 echo bcmul('2', '4'); // 8 ?>=====bcpow — 任意精度数字的乘方=====
<?php echo bcpow('4.2', '3', 2); // 74.08 ?>=====bcpowmod — Raise an arbitrary precision number to another, reduced by a specified modulus=====
<?php $a = bcpowmod($x, $y, $mod); $b = bcmod(bcpow($x, $y), $mod); // $a and $b are equal to each other. ?>=====bcscale — 设置所有bc数学函数的默认小数点保留位数=====
<?php // default scale : 3 bcscale(3); echo bcdiv('105', '6.55957'); // 16.007 // this is the same without bcscale() echo bcdiv('105', '6.55957', 3); // 16.007 ?>=====bcsqrt — 任意精度数字的二次方根=====
<?php echo bcsqrt('2', 3); // 1.414 ?>=====bcsub — 2个任意精度数字的减法=====
<?php $a = '1.234'; $b = '5'; echo bcsub($a, $b); // -3 echo bcsub($a, $b, 4); // -3.7660 ?>