Use the primary key value of the data as the index of the associative array to obtain the data

Question

After executing the fetch query, I got an array of results:

[row_choice] => Array
  (
    [0] => Array
      (
        [id] => 277410
        [text_value] => Two Wheel
      )
    [1] => Array
      (
        [id] => 277411
        [text_value] => Three Wheel
      )
    [2] => Array
      (
        [id] => 277412
        [text_value] => Four Wheel
      )
  )

How do I get an array of results like this?

[row_choice] => Array
  (
    [277410] => Array
      (
        [id] => 277410
        [text_value] => Two Wheel
      )
    [277411] => Array
      (
        [id] => 277411
        [text_value] => Three Wheel
      )
    [277412] => Array
      (
        [id] => 277412
        [text_value] => Four Wheel
      )
  )

What should I do?

My question is

SELECT id,text_value FROM answer_choice

Answer 1

从SQL查询中直接实现这个功能是不可能的，但是你可以检索所有的数据，然后重新映射数组。

使用PHP 5.5的array_column()函数，你可以做类似以下的操作：

$myarray['row_choice'] = array_combine(
    array_column($myarray['row_choice'], 'id'),
    $myarray['row_choice']
);

对于较早版本的PHP，可以使用array_map()函数来代替。

$myarray['row_choice'] = array_combine(
    array_map(
        function($value) {
            return $value['id'];
        },
        $myarray['row_choice']
    ),
    $myarray['row_choice']
);

你应该按照以下方式创建一个新的数组变量。

$recArr = array();

while ($records = mysqli_fetch_array($query)) {
    $recArr[$records['id']] = $records;
}

var_dump($recArr);

Answer 2

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