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run code in 150+ php & hhvm versions
Bugs & Features
<?php define('debug_mode', false); var_dump(defined('debug_mode'));
Output for 4.3.5 - 5.6.21, hhvm-3.12.0, 7.0.0 - 7.1.0
bool(true)
Output for hhvm-3.10.0

Process exited with code 137.
Output for 4.3.0 - 4.3.4
int(1)