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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 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6

Process exited with code 137.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/YErJ4 on line 6
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/YErJ4 on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/YErJ4 on line 6
Process exited with code 255.
preferences:
198.39 ms | 401 KiB | 310 Q