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<?php var_dump((array) null); var_dump((array) array(1,3));
Output for 5.3.6 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(0) { } array(2) { [0]=> int(1) [1]=> int(3) }