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run code in 200+ php & hhvm versions
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<?php define('DERP', false); define('C5_ENVIRONMENT_ONLY', true); var_dump(defined('C5_ENVIRONMENT_ONLY') && C5_ENVIRONMENT_ONLY || DERP == 'cli');
based on A9ZW3
Output for 4.3.0 - 7.2.0
bool(true)