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The VERY fast pi calculator compare to any other ones ever made in PHP. On my machine, this can easily find the 1000th decimal place of pi in 5 seconds
Read though and see an example of how it works
| <?
//Pi calculation code
//From Chao Xu
//At http://www.webdevlogs.com
function bcpi($precision){
$num = 0;$k = 0;
bcscale($precision+3);
$limit = ($precision+3)/14;
while($k < $limit){
$num = bcadd($num,bcdiv(bcmul(bcadd('13591409',bcmul('545140134', $k)),bcmul(bcpow(-1, $k), bcfact(6*$k))),bcmul(bcmul(bcpow('640320',3*$k+1),bcsqrt('640320')), bcmul(bcfact(3*$k), bcpow(bcfact($k),3)))));
++$k;
}
return bcdiv(1,(bcmul(12,($num))),$precision);
}
function bcfact($n){
return ($n == 0 || $n== 1) ? 1 : bcmul($n,bcfact($n-1));
}
?> | |
Usage Example
| echo bcpi(30);
//out put 30 places of pi | |
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