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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, $allowed); if (isset($results[$keyToFind])) { if (!isset($output[$keyToFind])) { $output[$keyToFind] = $results[$keyToFind]; } else { if (is_array($output[$keyToFind])) { $output[$keyToFind] = array_merge(array($output[$keyToFind]), (array)$results[$keyToFind]); } else { $output[$keyToFind] = array_merge((array)$output[$keyToFind], (array)$results[$keyToFind]); } } } } } } return $output; } $testArray = array( 'test' => array( 'percy' => array( 'percy' => array('percy' => 'anderson') ), 'mitch' => array( 'mitchell', 'anderson' ) ) ); var_dump(coolPluck($testArray, array('percy', 'mitch')));
Output for 4.3.0 - 7.1.0
array(2) { ["percy"]=> array(3) { [0]=> array(1) { ["percy"]=> array(1) { ["percy"]=> string(8) "anderson" } } [1]=> array(1) { ["percy"]=> string(8) "anderson" } [2]=> string(8) "anderson" } ["mitch"]=> array(2) { [0]=> string(8) "mitchell" [1]=> string(8) "anderson" } }