3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php define("EMAIL", "test@example.com"); // Valid name echo EMAIL; // Displays "test@example.com" define("USE_head", true); if (USE_head) { } // Evaluates to true define("1CONSTANT", "some value"); // Invalid name ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
test@example.com