3v4l.org

run code in 300+ PHP versions simultaneously
<?php $type = 'image'; $attach = 'url_to_image'; $array = [ $type => $attach ]; var_dump($array);
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(1) { ["image"]=> string(12) "url_to_image" }

preferences:
218.39 ms | 403 KiB | 287 Q