3v4l.org

run code in 300+ PHP versions simultaneously
<?php $hello[0]["y:1"] = "v:a"; $hello[0]["y:2"] = "v:b"; for($i=0;$i<count($hello[0]);$i++) { echo $hello[0]["y:".($i+1)]; }
Output for 7.0.0 - 7.0.20, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
v:av:b
preferences:
166.94 ms | 404 KiB | 219 Q