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<?php //Pi calculation code //From Chao Xu //At http://www.webdevlogs.com function bcpi($precision){ $num = "0";$k = "0"; bcscale(bcadd($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)); } echo bcpi(15);