3v4l.org

run code in 300+ PHP versions simultaneously
<?php $var = [ 'test' => 'hey there', 'test' => 'second part of test' ]; print_r( $var ); ////////
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Array ( [test] => second part of test )

preferences:
188.54 ms | 403 KiB | 287 Q