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run code in 300+ PHP versions simultaneously

@ 2017-08-28T14:07:41Z

<?php

$data = array(
    array(
        'id' => 1,
        'timestamp' => 1503050400,
        'name' => 'Event A',
        'value' => null,
    ),
    array(
        'id' => 2,
        'timestamp' => 1503446400,
        'name' => 'Event B',
        'value' => null,
    ),
    array(
        'id' => 2,
        'timestamp' => 1503446400,
        'name' => 'Event B',
        'value' => 71,
    ),
    array(
        'id' => 3,
        'timestamp' => 1503720000,
        'name' => 'Event C',
        'value' => 12,
    ),
    array(
        'id' => 3,
        'timestamp' => 1503720000,
        'name' => 'Event C',
        'value' => null,
    ),
);

$buckets = array();

foreach ($data as $item) {
    $bucketName = serialize(array(
        'id' => $item['id'],
        'timestamp' => $item['timestamp'],
        'name' => $item['name'],
    ));

    if (!array_key_exists($bucketName, $buckets)) {
        $buckets[$bucketName] = array();
    }

    $buckets[$bucketName][] = $item;
}

$filtered = array_reduce(
    $buckets,
    function (array $carry, array $items) {
        if (1 === count($items)) {
            $carry[] = array_shift($items);

            return $carry;
        }

        $withoutNullValue = array_filter($items, function (array $item) {
            return array_key_exists('value', $item) && null !== $item['value'];
        });

        if (0 < count($withoutNullValue)) {
            $carry = array_merge(
                $carry,
                $withoutNullValue
            );

            return $carry;
        }

        $carry[] = array_shift($items);

        return $carry;
    },
    array()
);

var_dump($filtered);

Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 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: array(3) { [0]=> array(4) { ["id"]=> int(1) ["timestamp"]=> int(1503050400) ["name"]=> string(7) "Event A" ["value"]=> NULL } [1]=> array(4) { ["id"]=> int(2) ["timestamp"]=> int(1503446400) ["name"]=> string(7) "Event B" ["value"]=> int(71) } [2]=> array(4) { ["id"]=> int(3) ["timestamp"]=> int(1503720000) ["name"]=> string(7) "Event C" ["value"]=> int(12) } }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17: Parse error: syntax error, unexpected T_FUNCTION in /in/Toq75 on line 54
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5: Parse error: parse error, unexpected T_FUNCTION in /in/Toq75 on line 54
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/Toq75 on line 54
Process exited with code 255.

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