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<?php if(UNDEFINED_CONST == true) echo 'True!';
based on JbLE2
Output for 7.2.0
Warning: Use of undefined constant UNDEFINED_CONST - assumed 'UNDEFINED_CONST' (this will throw an Error in a future version of PHP) in /in/RrcK4 on line 3 True!
Output for 4.3.0 - 7.1.10
Notice: Use of undefined constant UNDEFINED_CONST - assumed 'UNDEFINED_CONST' in /in/RrcK4 on line 3 True!