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PHP实现简单高精度的求PI方法
- WBOYOriginal
- 2016-06-20 12:45:01933browse
本篇是继上一篇 [PHP实现投镖求PI法，最笨但最有意思](http://www.yinqisen.cn/blog-676.html)讲完最笨的，再说一个更精巧的方法，代码如下：~~~.php<?php// pi = 2 + 2/3 + 2/3*2/5 + 2/3*2/5*2/7 + ...$pi = (double)2.0; $z = (double)2.0;$a = 1; $b = 3;while ($z > 0.0000000000001) { $z *= $a / $b; $pi += $z; $b += 2; $a++;}echo $pi."\n";echo "PHP PI() =>".pi()."\n";~~~源码中和PHP自带的pi()这个函数做了对比，精度一致，那猜猜pi()函数是如何实现的呢？
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