3v4l.org

run code in 300+ PHP versions simultaneously
<?php $slaves = [ [], ['config'] ]; if (($key = array_search(0, array_map('count', $slaves))) && $key !== false) { echo 'bad config'; } else { echo 'good config'; }
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
good config
preferences:
123.92 ms | 408 KiB | 5 Q