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<?php //namespace Foo; define('null', true); var_dump(null);
Output for 4.3.0 - 4.3.6, 4.3.9 - 4.4.9, 5.0.1 - 7.3.0rc6
Notice: Constant null already defined in /in/f1ETn on line 5 NULL
Output for 4.3.7 - 4.3.8, 5.0.0
Notice: Constant already defined in /in/f1ETn on line 5 NULL