Online PHP editor | rfc for EI4Tn

@ 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 git.master, git.master_jit, rfc.property-hooks: 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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2020-03-21 RFC: Is_Literal - declined
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2018-06-15 Typed Properties v2 - implemented in PHP 7.4
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2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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