3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x = array( "one" => 1, 2 => 1, "three" => 1, "four" => 1, 5 => 1 ); foreach($x as $y){ $y++; } var_dump($x);
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 - 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 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
array(5) { ["one"]=> int(1) [2]=> int(1) ["three"]=> int(1) ["four"]=> int(1) [5]=> int(1) }

preferences:
294.41 ms | 406 KiB | 423 Q