PHP如何对数组中相同tax_name项累加tax_price并保留其余字段

注意： 以下问题与类似问题逻辑接近，但需要适配当前场景的专属解决方案。

现有如下结构的数组：

Array
(
    [0] => Array
        (
            [tax_name] => VAT
            [tax_amount] => 3.000
            [tax_type] => P
            [tax_price] => 15.44
            [price_includes_tax] => Y
        )

    [1] => Array
        (
            [tax_name] => VAT
            [tax_amount] => 3.000
            [tax_type] => P
            [tax_price] => 59.68
            [price_includes_tax] => Y
        )

    [2] => Array
        (
            [tax_name] => VAT
            [tax_amount] => 3.000
            [tax_type] => P
            [tax_price] => 1.86
            [price_includes_tax] => Y
        )

    [3] => Array
        (
            [tax_name] => GST
            [tax_amount] => 3.300
            [tax_type] => P
            [tax_price] => 2.11
            [price_includes_tax] => N
        )

) 

需要按tax_name分组，累加同组的tax_price，同时保留其余字段：

Array
(
    [0] => Array
        (
            [tax_name] => VAT
            [tax_amount] => 3.000
            [tax_type] => P
            [tax_price] => 76.98
            [price_includes_tax] => Y
        )

    [1] => Array
        (
            [tax_name] => GST
            [tax_amount] => 3.300
            [tax_type] => P
            [tax_price] => 2.11
            [price_includes_tax] => N
        )

)

原有代码仅保留了tax_name和累加后的tax_price，丢失了其余字段：

$result = [];

array_walk($_tax_array, function($item) use (&$result) {
    if (!isset($result[$item['tax_name']])) {
        $result[$item['tax_name']] = 0;
    }

    $result[$item['tax_name']] += $item['tax_price'];
});

$resultFormated = [];
foreach ($result as $key => $value) {
    $resultFormated[] = ['tax_name' => $key, 'tax_price' => $value];
}

print_r($resultFormated);

上述代码输出结果：

Array
(
    [0] => Array
        (
            [tax_name] => VAT
            [tax_price] => 76.98
        )

    [1] => Array
        (
            [tax_name] => GST
            [tax_price] => 2.11
        )

)

实现逻辑为：以tax_name为分组键，首次遇到该税项时完整保存所有字段，后续同分组仅累加tax_price值，最后转为索引数组即可。

$result = [];

array_walk($_tax_array, function($item) use (&$result) {
    $taxName = $item['tax_name'];
    if (!isset($result[$taxName])) {
        // 首次出现对应税种时直接保存完整字段
        $result[$taxName] = $item;
    } else {
        // 已存在的税种仅累加tax_price
        $result[$taxName]['tax_price'] += $item['tax_price'];
    }
});

// 转为从0开始的索引数组，匹配期望输出结构
$resultFormated = array_values($result);

print_r($resultFormated);

内容的提问来源于stack exchange，提问作者Viira