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<?php $data = array('foo', 'bar'); function validate($data) { $first = array_shift($data); var_dump($data); return true; } validate($data); var_dump($data);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [0]=> string(3) "bar" } array(2) { [0]=> string(3) "foo" [1]=> string(3) "bar" }