<?php // Pi function (closure) loop 10 times for ($i = 0; $i < 50; $i++) { $start = microtime(true); $pi = 0; $top = 4; $bot = 1; $minus = true; $iterations = 1000000; for ($i = 0; $i < $iterations; $i++) { if ($minus) { $pi = $pi - ($top / $bot); $minus = false; } else { $pi = $pi + ($top / $bot); $minus = true; } $bot += 2; } }