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run code in 150+ php & hhvm versions
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<?php $pole = array ( 9, '6' => 2, 'x' => 0, 9 => 'b', 15, 'a', 8 ); print_r($pole);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => 9 [6] => 2 [x] => 0 [9] => b [10] => 15 [11] => a [12] => 8 )