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<?php $a = 'a-';echo var_dump(explode('-', $a)); ?>
Output for 4.3.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [0]=> string(1) "a" [1]=> string(0) "" }