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<?php $couponHolder = array(); $test = 'test'; $couponHolder['test'] = $test ? $test . '!' : null; print_r($couponHolder);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
Array ( [test] => test! )