3v4l.org

run code in 300+ PHP versions simultaneously
<?php function foo($content, $keys) { return sizeof($keys) === 0 ? $content : foo([array_pop($keys) => $content], $keys); } print_r(foo('bar', ['a', 'b', 'c', 'd', 'e']));
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 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 - 8.3.6
Array ( [a] => Array ( [b] => Array ( [c] => Array ( [d] => Array ( [e] => bar ) ) ) ) )
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[', expecting ')' in /in/2tcJ5 on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[', expecting ')' in /in/2tcJ5 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/2tcJ5 on line 3
Process exited with code 255.

preferences:
314.41 ms | 401 KiB | 358 Q