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run code in 300+ PHP versions simultaneously

@ 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 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7: Group1 - Blue - Round - (Harold, Arthur, Tom) Group1 - Green - Round - (Harold) Group1 - Green - Circle - (Todd, Mike) Group2 - Blue - Round - (Peter)

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260.86 ms | 404 KiB | 292 Q