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@ 2015-04-23T06:56:50Z

<?php
$arr = [
        'USA' =>
        [
            'Alabama' =>
            [
                'Montgomery',
                'Birmingham'
            ],
            'Arizona' =>
            [
                'Phoenix',
                'Mesa',
                'Gilbert'
            ]
        ],
        'Germany' =>
        [
            'West Germany' =>
            [
                'Bonn',
                'Cologne'
            ]
        ]
    ];
$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($arr));
$keys = array();
foreach ($iterator as $key => $value) {
    // Build long key name based on parent keys
    for ($i = $iterator->getDepth() - 1; $i >= 0; $i--) {
        $key = $iterator->getSubIterator($i)->key() . '_' . $key;
    }
    $keys[] = $key;
}
var_export($keys);

Output for git.master, git.master_jit, rfc.property-hooks: array ( 0 => 'USA_Alabama_0', 1 => 'USA_Alabama_1', 2 => 'USA_Arizona_0', 3 => 'USA_Arizona_1', 4 => 'USA_Arizona_2', 5 => 'Germany_West Germany_0', 6 => 'Germany_West Germany_1', )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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