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run code in 150+ php & hhvm versions
Bugs & Features
<?php function get_primes7($n) { if ($n < 2) return array(); if ($n == 2) return array(2); $s = array(); for($i = 3; $i <= $n; $i += 2) $s[] = $i; $mroot = sqrt($n); $half = count($s); $i = 0; $m = 3; while ($m <= $mroot) { if ($s[$i]) { $j = (int)(($m*$m - 3) / 2); $s[$j] = 0; while ($j < $half) { $s[$j] = 0; $j += $m; } } $i = $i + 1; $m = 2*$i + 3; } $res = array(2); foreach ($s as $v) { if ($v) { $res[] = $v; } } return $res; } $res = array(); for ($i = 1; $i <= 10; ++$i) { $res = get_primes7(10000); print "Found ".count($res)." prime numbers.\n"; }
based on me1Dr
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Found 1229 prime numbers. Found 1229 prime numbers. Found 1229 prime numbers. Found 1229 prime numbers. Found 1229 prime numbers. Found 1229 prime numbers. Found 1229 prime numbers. Found 1229 prime numbers. Found 1229 prime numbers. Found 1229 prime numbers.