3v4l.org

run code in 300+ PHP versions simultaneously
<?php function x(){ yield 1; yield 2; yield 3; } function a($x){ yield from $x; } foreach(a(a(x())) as $i => $x){ echo $i . "=>" . $x . "\n"; }
Output for 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
0=>1 1=>2 2=>3
preferences:
106.26 ms | 1474 KiB | 4 Q