3v4l.org

run code in 300+ PHP versions simultaneously
<?php function pfactor($n){ // max_n = 2^31-1 = 2147483647 $d=42; $factors = array(); $dmax = floor(sqrt($n)); $sieve = array(); $sieve = array_fill(1, $dmax,1); do{ $r = false; while ($n%$d==0){ $factors[$d]++; $n/=$d; $r = true; } if ($r){ $dmax = floor(sqrt($n)); } if ($n>1){ for ($i=$d;$i<=$dmax;$i+=$d){ $sieve[$i]=0; } do{ $d++; }while ($sieve[$d]!=1 && $d<$dmax); if ($d>$dmax){ $factors[$n]++; } } }while($n>1 && $d<=$dmax); return $factors; } ?>
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.32, 7.1.0 - 7.1.24, 7.2.0 - 7.2.33, 7.3.12 - 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
preferences:
268.76 ms | 406 KiB | 420 Q