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run code in 150+ php & hhvm versions
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<?php function coolPluck($array, $allowed) { $output = array(); foreach($allowed as $keyToFind) { foreach($array as $k => $v) { if($k === $keyToFind) { $output[$keyToFind] = $v; } if(is_array($v)) { $results = coolPluck($v, $allowed); $output = array_merge((array)$output, (array)$results); } } } return $output; } $testArray = array('test' => array('percy' => array('percy' => 'hatcherson'), 'percy' => array('mitchell', 'anderson'))); var_dump(coolPluck($testArray, array('percy')));
Output for 4.3.0 - 7.1.0
array(1) { ["percy"]=> array(2) { [0]=> string(8) "mitchell" [1]=> string(8) "anderson" } }