3v4l.org

run code in 300+ PHP versions simultaneously
<?php $aa = [47, 51]; Foreach($aa as $a){ $b[] = $a; print_r($b); } print_r($b);
Output for 7.1.0 - 7.1.33, 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 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
Array ( [0] => 47 ) Array ( [0] => 47 [1] => 51 ) Array ( [0] => 47 [1] => 51 )
preferences:
102.8 ms | 1612 KiB | 4 Q