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<?php $test = array(0 => 'zero', '' => 'empty string'); var_dump($test);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [0]=> string(4) "zero" [""]=> string(12) "empty string" }