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@ 2018-04-06T01:37:59Z

<?php

function sumArray($array, $index, $col) {
    $returnArray = []; // temporary container
    // sanity checks
    if (!is_array($array)) {
        return 'error not an array';
    }
    $firstRow = reset($array);
    if (!array_key_exists($index, $firstRow) || !array_key_exists($col, $firstRow)) {
        return 'error keys provided not found';
    }
    foreach ($array as $value) {
        if (!isset($returnArray[$value[$index]])) { // initialize
            $returnArray[$value[$index]] = [$index => $value[$index], $col => 0];
        }
        // add value
        $returnArray[$value[$index]][$col] += $value[$col];
    }

    return $returnArray;
}

$products = array (
                     array("Id" => "000001", 
                          "Name" => "Cheese", 
                          "Quantity" => "10", 
                          "Price" => "10"),

                    array("Id" => "000001", 
                          "Name" => "Cheese", 
                          "Quantity" => "20", 
                          "Price" => "20"),

                    array("Id" => "000001", 
                          "Name" => "Cheese", 
                          "Quantity" => "10", 
                          "Price" => "30"),

                    array("Id" => "000002", 
                          "Name" => "Ham", 
                          "Quantity" => "20", 
                          "Price" => "200"),

                    array("Id" => "000002", 
                          "Name" => "Ham", 
                          "Quantity" => "9", 
                          "Price" => "100"),

                    array("Id" => "000003", 
                          "Name" => "Baicon", 
                          "Quantity" => "40", 
                          "Price" => "900")
                       );

$summedArray = sumArray($products, 'Id', 'Quantity');
print_r($summedArray);

Output for 7.1.0 - 7.1.25, 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0: Array ( [000001] => Array ( [Id] => 000001 [Quantity] => 40 ) [000002] => Array ( [Id] => 000002 [Quantity] => 29 ) [000003] => Array ( [Id] => 000003 [Quantity] => 40 ) )
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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