Online PHP editor | output for kRVDc

@ 2023-01-04T12:11:15Z

<?php


$collection = [
    [1 => 10.0, 2 => 20.0, 3 => 50.0, 4 => 80.0, 5 => 100.0],
    [3 => 20.0, 5 => 20.0, 6 => 100.0, 7 => 10.0],
    [1 => 30.0, 3 => 30.0, 5 => 10.0, 8 => 10.0]
];

var_export(
    array_reduce(
        array_keys(
            array_intersect_ukey(
                ...array_merge(
                    $collection,
                    [fn($a, $b) => $a <=> $b]
                )
            )
        ),
        fn($result, $k) =>
            $result + [$k => array_sum(array_column($collection, $k)) / count($collection)],
        []
    )
);

Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0: array ( 3 => 33.333333333333336, 5 => 43.333333333333336, )
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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