3v4l.org

run code in 300+ PHP versions simultaneously
<?php $current_url = 'foo.bar.baz.com'; $current_domains = explode( '.', $current_url ); $current_top_domain = array_slice( $current_domains, 2 ); echo implode( '.', $current_top_domain );
Output for 7.0.0 - 7.0.31, 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
baz.com
preferences:
198.69 ms | 404 KiB | 243 Q