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<?php function foo($a = 'asdf', $b = '') { var_dump(func_get_args()); } foo(); foo(NULL, 'qwer');
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(0) { } array(2) { [0]=> NULL [1]=> string(4) "qwer" }