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<?php var_dump((array) null); var_dump((array) false); var_dump((array) ''); var_dump((array) 0);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(0) { } array(1) { [0]=> bool(false) } array(1) { [0]=> string(0) "" } array(1) { [0]=> int(0) }