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run code in 150+ php & hhvm versions
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<?php $x = array(1,'x' => 3, 2, 4); //$x['x'] = 5; print_r(array_values($x));
based on icTlq
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => 1 [1] => 3 [2] => 2 [3] => 4 )