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<?php function sieve($limit) { if ($limit < 3) { if ($limit < 2) { return []; } return array_slice([2, 3], 0, $limit - 1); } $nums = range(3, $limit - !($limit % 2), 2); for ($p = key($nums); $p; next($nums)) { for ($n = $p; $n < $limit; $n += $p) { unset($nums[$n]); } } return $nums; } var_dump(sieve(20));
Output for git.master, git.master_jit, rfc.property-hooks
array(9) { [0]=> int(3) [1]=> int(5) [2]=> int(7) [3]=> int(9) [4]=> int(11) [5]=> int(13) [6]=> int(15) [7]=> int(17) [8]=> int(19) }

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