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run code in 150+ php & hhvm versions
Bugs & Features
<?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));
based on 4ji6Q
Output for 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
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) }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/PHiIh on line 6
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/PHiIh on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/PHiIh on line 6
Process exited with code 255.