3v4l.org

run code in 300+ PHP versions simultaneously
<?php $keys = array('foo', 5, 10, 'bar'); $a = array_fill_keys($keys, 'banana'); print_r($a);
Output for 5.4.0 - 5.4.45, 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 - 7.2.34, 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 ( [foo] => banana [5] => banana [10] => banana [bar] => banana )
preferences:
265.53 ms | 404 KiB | 385 Q