PHP exact calculation function example

黄舟
Release: 2023-03-06 07:00:01
Original
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The example in this article describes the precise calculation function of PHP. Share it with everyone for your reference, the details are as follows:

Introduction: Be sure to ensure the accuracy of the data. This is the basic quality of a good programmer.

<?php
/**
 * 精确加法
 * @param [type] $a [description]
 * @param [type] $b [description]
 */
function math_add($a,$b,$scale = &#39;2&#39;) {
  return bcadd($a,$b,$scale);
}
/**
 * 精确减法
 * @param [type] $a [description]
 * @param [type] $b [description]
 */
function math_sub($a,$b,$scale = &#39;2&#39;) {
  return bcsub($a,$b,$scale);
}
/**
 * 精确乘法
 * @param [type] $a [description]
 * @param [type] $b [description]
 */
function math_mul($a,$b,$scale = &#39;2&#39;) {
  return bcmul($a,$b,$scale);
}
/**
 * 精确除法
 * @param [type] $a [description]
 * @param [type] $b [description]
 */
function math_p($a,$b,$scale = &#39;2&#39;) {
  return bcp($a,$b,$scale);
}
/**
 * 精确求余/取模
 * @param [type] $a [description]
 * @param [type] $b [description]
 */
function math_mod($a,$b) {
  return bcmod($a,$b);
}
/**
 * 比较大小
 * @param [type] $a [description]
 * @param [type] $b [description]
 * 大于 返回 1 等于返回 0 小于返回 -1
 */
function math_comp($a,$b,$scale = &#39;5&#39;) {
  return bccomp($a,$b,$scale); // 比较到小数点位数
}
echo math_add(&#39;3.445&#39;,&#39;3.444&#39;)."\n"; // 加 6.88
echo math_sub(&#39;3.445&#39;,&#39;3.444&#39;)."\n"; // 减 0.00
echo math_mul(&#39;3.445&#39;,&#39;3.444&#39;)."\n"; // 乘 11.86
echo math_p(&#39;3.445&#39;,&#39;3.444&#39;)."\n"; // 除 1.00
echo math_mod(&#39;3.445&#39;,&#39;3.444&#39;)."\n"; // 取模 0
echo math_comp(&#39;3.445&#39;,&#39;3.444&#39;)."\n";// 比较 1
echo math_add(&#39;3.445&#39;,&#39;3.444&#39;,&#39;3&#39;)."\n"; // 加 6.889
echo math_sub(&#39;3.445&#39;,&#39;3.444&#39;,&#39;3&#39;)."\n"; // 减 0.001
echo math_mul(&#39;3.445&#39;,&#39;3.444&#39;,&#39;3&#39;)."\n"; // 乘 11.864
echo math_p(&#39;3.445&#39;,&#39;3.444&#39;,&#39;3&#39;)."\n"; // 除 1.000
echo math_mod(&#39;3.445&#39;,&#39;3.444&#39;)."\n"; // 取模 0
echo math_comp(&#39;3.445&#39;,&#39;3.444&#39;)."\n";// 比较 1
?>
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