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run code in 150+ php & hhvm versions
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<?php $x[10] = 'test'; $x['10'] = 'testss'; var_dump($x);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [10]=> string(6) "testss" }