3v4l.org

run code in 300+ PHP versions simultaneously
<?php $constant = 'STDOUT'; if (constant($constant) && ! is_scalar($constant)) { echo 'Yes, I am non-scalar constant'; }
Output for 5.2.3 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 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
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.2
Warning: constant(): Couldn't find constant STDOUT in /in/sF8UQ on line 4
Output for 4.3.0 - 4.3.1
Warning: constant() [http://www.php.net/function.constant]: Couldn't find constant STDOUT in /in/sF8UQ on line 4

preferences:
177.88 ms | 401 KiB | 338 Q