3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php const API_KEY = 'ABCD1234'; echo API_KEY + 'test'; echo API_KEY . 'test';
based on PiMuL
Output for 7.1.0 - 7.2.0
Warning: A non-numeric value encountered in /in/bBHo2 on line 5 Warning: A non-numeric value encountered in /in/bBHo2 on line 5 0ABCD1234test
Output for 5.3.19 - 7.0.20
0ABCD1234test