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@ 2015-09-08T10:37:32Z

<?php
$array = array(
    array("title" => 1, "children" => array(
            array(
                "selected" => true,
                "key" => 100,
                "children" => array()
            )
        ),
        array(
                "selected" => true,
                "key" => 200,
                "children" => array(
                    array(
                        "selected" => true,
                        "key" => 300,
                        "children" => array(
                            array(
                                "selected" => true,
                                "key" => 400,
                                "children" => array()
                            )
                        )
                    )
                )
            )
    )    
);
        $selectedValues = array();
            $iterator = new \RecursiveIteratorIterator(new \RecursiveArrayIterator($array));
            foreach ($iterator as $key => $value) {
                if ($key == "selected") {
                    $depth       = $iterator->getDepth();
                    $subIterator = $iterator->getSubIterator($depth);
                    foreach ($subIterator as $key2 => $value2) {
                        if ($key2 == "key") {
                            echo $value2 . PHP_EOL;    
                        }
                    }  
                }
            }

Output for git.master, git.master_jit, rfc.property-hooks: 100 200

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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