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@ 2018-01-02T13:36:48Z

<?php

function paths(array $a)
{
    // if first item is an array, recurse
    if (is_array(reset($a))) {
        foreach ($a as $k => $v) {
            foreach (paths($v) as $path) {
                // yield "key - subpath"
                yield sprintf('%s - %s', $k, $path);
            }
        }
    } else {
        // yield leaf
        yield sprintf('(%s)', implode(', ', $a));
    }
}

$obj = json_decode('{
    "Group1": {
        "Blue": {
            "Round": [
                "Harold",
                "Arthur",
                "Tom"
            ]
        },
        "Green": {
            "Round": [
                "Harold"
            ],
            "Circle": [
                "Todd",
                "Mike"
            ]
        }
    },
    "Group2": {
        "Blue": {
            "Round": [
                "Peter"
            ]
        }
    }
}', true);

foreach (paths($obj) as $path) {
    printf("%s\n", $path);
}

Output for git.master, git.master_jit, rfc.property-hooks: Group1 - Blue - Round - (Harold, Arthur, Tom) Group1 - Green - Round - (Harold) Group1 - Green - Circle - (Todd, Mike) Group2 - Blue - Round - (Peter)

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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