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run code in 200+ php & hhvm versions
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<?php (defined('BASE_FREE_CARRIAGE') || BASE_FREE_CARRIAGE < 0) || define('BASE_FREE_CARRIAGE', $default_arr['base_free_carriage']);
based on i0DZK
Output for 7.2.0
Warning: Use of undefined constant BASE_FREE_CARRIAGE - assumed 'BASE_FREE_CARRIAGE' (this will throw an Error in a future version of PHP) in /in/CWgjA on line 3 Notice: Undefined variable: default_arr in /in/CWgjA on line 4
Output for 5.3.20 - 7.1.10
Notice: Use of undefined constant BASE_FREE_CARRIAGE - assumed 'BASE_FREE_CARRIAGE' in /in/CWgjA on line 3 Notice: Undefined variable: default_arr in /in/CWgjA on line 4