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<?php $id = ''; $parentId = '2'; $a = array(); $a[$id || $parentId] = 'fo'; var_dump($a);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [1]=> string(2) "fo" }