我创建了一个默认数组，我正在尝试根据默认数组中的rating和返回的数据库项替换数组中的值。我这样做是为了如果不是返回数据库中的所有ratings，我有一个默认值。
因此，当它运行时，我会得到9项目的最终列表，因为数据库中的值只是附加到列表中，但永远不会被替换。
$ratings['results'] = array_merge([
['rating'=>5, 'rating_count'=>0, 'percent'=>0, 'average'=>0],
['rating'=>4, 'rating_count'=>0, 'percent'=>0, 'average'=>0],
['rating'=>3, 'rating_count'=>0, 'percent'=>0, 'average'=>0],
['rating'=>2, 'rating_count'=>0, 'percent'=>0, 'average'=>0],
['rating'=>1, 'rating_count'=>0, 'percent'=>0, 'average'=>0],
], $ratings['results']);
以下是数据库项：
array(1) {
["results"]=>
array(4) {
[0]=>
object(stdClass)#260 (4) {
["rating"]=>
int(3)
["rating_count"]=>
int(2)
["percent"]=>
string(7) "50.0000"
["average"]=>
string(6) "3.0000"
}
[1]=>
object(stdClass)#261 (4) {
["rating"]=>
int(4)
["rating_count"]=>
int(1)
["percent"]=>
string(7) "25.0000"
["average"]=>
string(6) "4.0000"
}
[2]=>
object(stdClass)#262 (4) {
["rating"]=>
int(5)
["rating_count"]=>
int(1)
["percent"]=>
string(7) "25.0000"
["average"]=>
string(6) "5.0000"
}
[3]=>
object(stdClass)#263 (4) {
["rating"]=>
NULL
["rating_count"]=>
int(4)
["percent"]=>
string(8) "100.0000"
["average"]=>
string(6) "3.7500"
}
}
}
以下是最终的 json 响应（注意：评级 = null 的项目是摘要列）：
{
"results": [
{
"rating": 5,
"rating_count": 0,
"percent": 0,
"average": 0
},
{
"rating": 4,
"rating_count": 0,
"percent": 0,
"average": 0
},
{
"rating": 3,
"rating_count": 0,
"percent": 0,
"average": 0
},
{
"rating": 2,
"rating_count": 0,
"percent": 0,
"average": 0
},
{
"rating": 1,
"rating_count": 0,
"percent": 0,
"average": 0
},
{
"rating": 3,
"rating_count": 2,
"percent": "50.0000",
"average": "3.0000"
},
{
"rating": 4,
"rating_count": 1,
"percent": "25.0000",
"average": "4.0000"
},
{
"rating": 5,
"rating_count": 1,
"percent": "25.0000",
"average": "5.0000"
},
{
"rating": null,
"rating_count": 4,
"percent": "100.0000",
"average": "3.7500"
}
]
}
它不是这样工作的。您有数字数组，array_merge：
将一个或多个数组的元素合并在一起，以便将一个数组的值追加到前一个数组的末尾。它返回结果数组。 源
除此之外，您的defaults是一个多维数组，而results是一个对象数组，因此需要进行一些转换。
你可以做这样的事情：
// fill resulting array with default values
$result = [
['rating'=>5, 'rating_count'=>0, 'percent'=>0, 'average'=>0],
['rating'=>4, 'rating_count'=>0, 'percent'=>0, 'average'=>0],
['rating'=>3, 'rating_count'=>0, 'percent'=>0, 'average'=>0],
['rating'=>2, 'rating_count'=>0, 'percent'=>0, 'average'=>0],
['rating'=>1, 'rating_count'=>0, 'percent'=>0, 'average'=>0],
];
// index results from the database to speed it up a bit
$indexed = [];
foreach($ratings['results'] as $rating) {
// be careful, if you have same rating from the db, only the last one counts
$indexed[$rating->rating] = (array)$rating;
};
//merge line by line
array_walk(
$result,
function(&$row, $key, $data) {
if(isset($data[$row['rating']])) {
$row = array_merge($row, $data[$row['rating']]);
};
},
$indexed
);