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run code in 150+ php & hhvm versions
Bugs & Features
<?php function y($x) { return pow($x, 2);}function integrate($a, $b, $n) { $h = ($b-$a)/$n; $m = (1/2)*$h; $num = 0; for ($i = 1; $i <= $n-1; $i++) { $num += y($a + $i*$h); } return $m*(y($a) + y($b) + $num);}var_dump(integrate(1, 3, 100));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
float(4.3834)