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@ 2013-10-09T20:54:06Z

<?php

function coolPluck($array, $allowed) {
        $output = array();

    foreach($array as $k => $v) {
        foreach($allowed as $keyToFind) {
            if($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)$result[$keyToFind]);
                        }
                    }
                }

            }
        }
    }

    return $output;
}


$testArray = array(
    'test' => array(
    	'percy' => array(
        	'philip' => array('percy' => array(
					'mitch' => array('percy' => 'cool', 'mitch' => 'anderson')
            	)
            )
         ), 
        'mitch' => array(
        	'mitchell', 
        	'anderson'
        )
      )
    );


var_dump(coolPluck($testArray, array('percy', 'mitch')));

Output for git.master, git.master_jit, rfc.property-hooks: array(2) { ["percy"]=> array(3) { [0]=> array(1) { ["philip"]=> array(1) { ["percy"]=> array(1) { ["mitch"]=> array(2) { ["percy"]=> string(4) "cool" ["mitch"]=> string(8) "anderson" } } } } [1]=> array(1) { ["mitch"]=> array(2) { ["percy"]=> string(4) "cool" ["mitch"]=> string(8) "anderson" } } [2]=> string(4) "cool" } ["mitch"]=> array(2) { [0]=> string(8) "mitchell" [1]=> string(8) "anderson" } }

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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