3v4l.org

run code in 300+ PHP versions simultaneously
<?php function gen() { yield 10 => "gen"; yield "another"; } foreach(gen() as $key => $val) { echo "$key => $val\n"; }
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
10 => gen 11 => another

preferences:
199.41 ms | 404 KiB | 326 Q