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run code in 150+ php & hhvm versions
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<?php $data = array( 8 => 2, 4 => 4, 7 => 6, ); print_r($data);
based on obI3W
Output for 4.3.0 - 7.1.0
Array ( [8] => 2 [4] => 4 [7] => 6 )