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run code in 200+ php & hhvm versions
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<?php $hits[0][] = 1; $hits[1][] = 2; $hits[2][] = 3; print_r ($hits);
Output for 4.3.0 - 7.2.0
Array ( [0] => Array ( [0] => 1 ) [1] => Array ( [0] => 2 ) [2] => Array ( [0] => 3 ) )