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<?php function test() { return !!''; } var_dump(test);
Output for 7.2.0
Warning: Use of undefined constant test - assumed 'test' (this will throw an Error in a future version of PHP) in /in/aO1pN on line 7 string(4) "test"
Output for 4.3.0 - 7.1.10
Notice: Use of undefined constant test - assumed 'test' in /in/aO1pN on line 7 string(4) "test"