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@ 2017-08-31T10:38:21Z

<?php

function merge(array ...$sets)
{
    /**
     * group contributions by name
     */
    $contributions = array_reduce(
        $sets,
        function (array $contributions, array $set) {
            foreach ($set as $element) {
                $name = $element['P_Name'];
                $contribution = $element['Contribution'];

                if (!array_key_exists($name, $contributions)) {
                    $contributions[$name] = [];
                }

                $contributions[$name][] = $contribution;

            }

            return $contributions;
        },
        []
    );

    /**
     * normalize the array so we remove the name as key, and return a tuple of name and contribution, with the desired
     * structure
     */
    return array_values(array_map(function (array $contribution, $name) {
        return [
            'Contribution' => array_sum($contribution),
            'P_Name' => $name,
        ];
    }, $contributions, array_keys($contributions)));
}

$a = [
    [
        'Contribution' => 1000,
        'P_Name' => 'A',
    ],
    [
        'Contribution' => 1500,
        'P_Name' => 'B',
    ],
];

$b = [
    [
        'Contribution' => 100,
        'P_Name' => 'A',
    ],
    [
        'Contribution' => 200,
        'P_Name' => 'B',
    ],
];

$merged = merge($a, $b);

var_dump($merged);

Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: array(2) { [0]=> array(2) { ["Contribution"]=> int(1100) ["P_Name"]=> string(1) "A" } [1]=> array(2) { ["Contribution"]=> int(1700) ["P_Name"]=> string(1) "B" } }
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 array(2) { [0]=> array(2) { ["Contribution"]=> int(1100) ["P_Name"]=> string(1) "A" } [1]=> array(2) { ["Contribution"]=> int(1700) ["P_Name"]=> string(1) "B" } }

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