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<?php var_dump(null); // null var_dump(NULL); // null define("NULL","hello world"); var_dump(null); // null var_dump(NULL); // hello world define("null","hello world"); //Notice: Constant null already defined ?>
Output for 5.1.3 - 5.6.28, 7.0.0 - 7.1.0
NULL NULL NULL NULL Notice: Constant null already defined in /in/tuqT1 on line 7
Output for hhvm-3.10.0 - 3.12.0
NULL NULL Notice: Constant NULL already defined in /in/tuqT1 on line 4 NULL NULL Notice: Constant null already defined in /in/tuqT1 on line 7
Output for 4.3.0 - 4.3.6, 4.3.9 - 4.4.9, 5.0.1 - 5.1.2
NULL NULL NULL string(11) "hello world" Notice: Constant null already defined in /in/tuqT1 on line 7
Output for 4.3.7 - 4.3.8, 5.0.0
NULL NULL NULL string(11) "hello world" Notice: Constant already defined in /in/tuqT1 on line 7