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<?php define('undefined', null); function my_function($hello = 123) { var_dump($hello); } my_function(null); // > null my_function(undefined); // > 123 my_function($v);
Output for rfc.property-hooks, git.master, git.master_jit
NULL NULL Warning: Undefined variable $v in /in/SblIZ on line 12 NULL

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