有条件地按不同值对多维数组进行排序

我有下一个multidimensioanl数组（它很长，但我在这里复制了第一个元素）：

[0] => Array
    (
        [cpt] => Product
        [tax] => Type A
        [year] => 2012
    )
[1] => Array
    (
        [cpt] => Product
        [tax] => Type B
        [year] => 2012
    )
[2] => Array
    (
        [cpt] => Product
        [tax] => Type C
        [year] => 2011
    )
[3] => Array
    (
        [cpt] => Product
        [tax] => Type C
        [year] => 2011
    )
[4] => Array
    (
        [cpt] => Product
        [tax] => Type D
        [year] => 2015
    )
[5] => Array
    (
        [cpt] => Review
        [tax] => Figure
        [year] => 2014
    )
[6] => Array
    (
        [cpt] => Review
        [tax] => Sample
        [year] => 2012
    )
[7] => Array
    (
        [cpt] => Review
        [tax] => Figure
        [year] => 2012
    )
[8] => Array
    (
        [cpt] => Review
        [tax] => Picture based
        [year] => 2015
    )
[9] => Array
    (
        [cpt] => Review
        [tax] => Figure
        [year] => 2012
    )
[10] => Array
    (
        [cpt] => Review
        [tax] => Picture based
        [year] => 2013
    )
[11] => Array
    (
        [cpt] => Template
        [tax] => L
        [year] => 2013
    )
[12] => Array
    (
        [cpt] => Template
        [tax] => L
        [year] => 2015
    )
[13] => Array
    (
        [cpt] => Template
        [tax] => M
        [year] => 2011
    )
[14] => Array
    (
        [cpt] => Template
        [tax] => S
        [year] => 2011
    )

税收"值排序，最后按"年份"排序。

问题是"cpt"和"tax"的排序顺序应该是自定义顺序，而不是按字母顺序。

好消息是：

• 数组始终按"cpt"完美排序生成（您可以见）。所以我不在乎排序。
• 我只需要应用这些排序更改（首先在"税收"中，以及"年"下一个）对于特定的"cpt"，即"评论"。

这是我的代码，但它无效，因为它也改变了"cpt"顺序。

$sort_tax = array("Sample","Figure","Picture based");
usort($the_array, function ($a, $b) use ($sort_tax) {
    $pos_a = array_search($a['tax'], $sort_tax);
    $pos_b = array_search($b['tax'], $sort_tax);
    $result = $pos_a - $pos_b;
    if ($result == 0) {
        $difference = $a['year'] - $b['year'];
        if ($difference >= 0) {
            $value = 0;
        } else {
            $value = 1;
        }
        return $value;
    } else {
        return $pos_a - $pos_b;
    }
});

有什么想法吗？提前非常感谢！