3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php if(defined("WHATEVER_THIS_ISNT_DEFINED")){ // double quotes needed! echo 'yup, constant defined'; } else { echo 'nope, does not exist'; } if(defined('WHATEVER_THIS_ISNT_DEFINED')){ // single quotes won't suppress error notice? no, they work! echo 'yup, constant defined'; } else { echo 'nope, does not exist'; } if(defined(WHATEVER_THIS_ISNT_DEFINED)){ // no quotes then error notice echo 'yup, constant defined'; } else { echo 'nope, does not exist'; }
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
nope, does not existnope, does not exist Notice: Use of undefined constant WHATEVER_THIS_ISNT_DEFINED - assumed 'WHATEVER_THIS_ISNT_DEFINED' in /in/9gGRD on line 17 nope, does not exist