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run code in 300+ PHP versions simultaneously

@ 2022-09-09T06:20:00Z

<?php

$arr=Array
(
    "1" => Array
        (
            "1" => "c1",
            "2" => "c1",
            "3" => "c1",
            "4" => "c1",
            "5" => "c1",
            "6" => "c1",
            "7" => "c1",
            "8" => "c1",
            "9" => "c1",
            "10" => "c1",
            "11" => "c1",
            "12" => "c1"
        ),
    "10" => Array
        (
            "1" => "c2",
            "2" => "c2",
            "3" => "c2",
            "4" => "c2",
            "5" => "c2",
            "6" => "c2",
            "7" => "c2",
            "8" => "c2",
            "9" => "c2",
            "10" => "c2",
            "11" => "c2",
            "12" => "c2"
        )
);

echo json_encode(
    array_map(
        null,
        array_keys(current($arr)),
        ...$arr
    ),
    JSON_PRETTY_PRINT
);

Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14: [ [ 1, "c1", "c2" ], [ 2, "c1", "c2" ], [ 3, "c1", "c2" ], [ 4, "c1", "c2" ], [ 5, "c1", "c2" ], [ 6, "c1", "c2" ], [ 7, "c1", "c2" ], [ 8, "c1", "c2" ], [ 9, "c1", "c2" ], [ 10, "c1", "c2" ], [ 11, "c1", "c2" ], [ 12, "c1", "c2" ] ]

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