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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 git.master, git.master_jit, rfc.property-hooks
NULL NULL Warning: Constant NULL already defined in /in/Lp400 on line 5 NULL NULL Warning: Constant null already defined in /in/Lp400 on line 8

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