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run code in 150+ php & hhvm versions
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<?php define('FACEBOOK_LOGIN_ENABLED', false); if(FACEBOOK_LOGIN_ENABLED){ echo 'its on'; } else { echo 'its off'; }
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
its off