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run code in 200+ php & hhvm versions
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<?php print_r(array_column([['userId' => 11, '4233' => 4],['userId' => 22, 'adsf' => 66]], 'userId'));
based on N9GL6
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
Array ( [0] => 11 [1] => 22 )