3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php define('Zfoo', 'abc' /*, true */); define('Zbar', ZFOO); echo Zfoo; echo ZFOO; echo Zbar;
Output for 7.2.0
Warning: Use of undefined constant ZFOO - assumed 'ZFOO' (this will throw an Error in a future version of PHP) in /in/8EXbU on line 3 abc Warning: Use of undefined constant ZFOO - assumed 'ZFOO' (this will throw an Error in a future version of PHP) in /in/8EXbU on line 6 ZFOOZFOO
Output for 5.3.20 - 7.1.10
Notice: Use of undefined constant ZFOO - assumed 'ZFOO' in /in/8EXbU on line 3 abc Notice: Use of undefined constant ZFOO - assumed 'ZFOO' in /in/8EXbU on line 6 ZFOOZFOO