数组重复的值相加

$arr = array(

    array(

        "barcode" => "041167660317",

        "qty" => 1,

        "price" => "55.80",

        "tax" => "6.6401800000000000"

    ),

    array(

        "barcode" => "9311770598279",

        "qty" => 1,

        "price" => "97.00",

        "tax" => "11.5426800000000000"

    ),

    array(

        "barcode" => "9349254002288",

        "qty" => 2,

        "price" => "55.10",

        "tax" => "6.5572300000000000"

    ),

    array(

        "barcode" => "9311770598279",

        "qty" => 2,

        "price" => "83.00",

        "tax" => "9.8767900000000000"

    ),

    array(

        "barcode" => "9311770598279",

        "qty" => 1,

        "price" => "97.00",

        "tax" => "11.5426800000000000"

    )

);

$unique_keys = array();

foreach ($arr as $key => $value) {

    if (isset($unique_keys[$value["barcode"]])) {

        $index = $unique_keys[$value["barcode"]];

        foreach ($arr[$index] as $k => &$v) {

            if ($k !== "barcode") {

                $v += $value[$k];

            }

        }

        unset($arr[$key]);

    } else {

        $unique_keys[$value["barcode"]] = $key;

    }

}

var_export($arr);