3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php echo is_numeric(_4423423) ? "Y" : "N"; ?>
based on jhb9i
Output for 7.2.0
Warning: Use of undefined constant _4423423 - assumed '_4423423' (this will throw an Error in a future version of PHP) in /in/Mo6nb on line 3 N
Output for 5.3.22 - 7.1.10
Notice: Use of undefined constant _4423423 - assumed '_4423423' in /in/Mo6nb on line 3 N