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run code in 200+ php & hhvm versions
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<?php $a = []; $a[1][] = 'test'; var_dump($a);
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.2.6
array(1) { [1]=> array(1) { [0]=> string(4) "test" } }