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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 ($p = current($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

Process exited with code 137.

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