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<?php $result = 0; $result2 = 10; $one = function() { var_dump($result); }; $two = function() use ($result) { var_dump($result); }; $three = function() use (&$result) { var_dump($result); }; $four = function($r) use (&$result) { var_dump($r); }; $result++; $one(); // outputs NULL: $result is not in scope $two(); // outputs int(0): $result was copied $three(); // outputs int(1) $four($result2);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $result in /in/MNJfS on line 5 NULL int(0) int(1) int(10)

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