如何在PHP中生成嵌套关联数组？

I asked a question here, so many thanks to Gordon Linoff for his complete answer on SQL section of it.

我在这里问了一个问题,非常感谢Gordon Linoff对SQL部分的完整答案。

Problem

I have a sql table ( with PRIMARY KEY = [ ip & id ] ) , like this:

我有一个sql表(使用PRIMARY KEY = [ip&id]),如下所示:

ip | id | visits

and I want to generate a php array from that table, like this:

我想从该表生成一个php数组,如下所示:

product_rating_for_ip = array(
  ip=>array(
    id=>rating, id=>rating, ...
  ),
  ip=>array(
    id=>rating, id=>rating, ...
  ),
  .
  .
  .
);

for example:

product_rating_for_ip = array(
  "78.125.15.92"=>array(
    1=>0.8,2=>0.2,3=>1.0
  ),
  "163.56.75.112"=>array(
    1=>0.1,2=>0.3,3=>0.5,8=>0.1,12=>1.0
  ),
  .
  .
  .
);

Gordon Linoff suggested this SQL query which works fine:

Gordon Linoff建议这个SQL查询工作正常:

SQL Query

select v.ip, group_concat(concat(v.id, ':', v.visits / iv.maxvisits)) as ratings
from visit v join
  (SELECT ip, id, visits, max(visits) as maxvisits
  FROM visit
  GROUP BY ip
  ) iv
 on v.ip = iv.ip
group by v.ip;

which produces this:

产生这个:

+-------------+--------------------------+
|ip           |ratings                   |
+-------------+--------------------------+
|154.18.72.15 |2:0.1667,1:1.0000,3:0.1667|  
|162.16.18.22 |1:1.0000,3:0.3750,2:0.1250|  
|142.128.1.14 |2:1.0000,1:0.2500,3:0.5000|  
|78.15.92.131 |1:0.1429,3:1.0000,2:0.2857|  
+-------------+--------------------------+    

Question in summary

How can I put this result set into this PHP array?

如何将此结果集放入此PHP数组中?

    product_rating_for_ip = array(
      ip=>array(
        id=>rating, id=>rating, ...
      ),
      ip=>array(
        id=>rating, id=>rating, ...
      ),
      .
      .
      .
    );

My problematic answer

I think I should do as this (may be incorrect or inefficient):

我想我应该这样做(可能不正确或效率低下):

$stmt = mysqli_prepare($con, "select ...");
mysqli_stmt_execute($stmt);
mysqli_stmt_bind_result($stmt,$ip,$ratings);
while (mysqli_stmt_fetch($stmt)){
  $value_array = explode(",",$ratings);
  product_rating_for_ip = array_fill_keys($ip, $value_array);
}

1 个解决方案

#1

mysqli_stmt_execute($stmt);
mysqli_stmt_bind_result($stmt,$ip,$ratings);
$product_rating_for_ip = array();
while (mysqli_stmt_fetch($stmt)){
    $value_array = explode(",",$ratings);
    foreach ($value_array as $key => $value){
        $parts = explode(':', $value);
        $product_rating_for_ip[$ip][$parts[0]] = $parts[1];
    }
}