Codeigniter从数据库创建关联数组并在下拉列表中使用

Question

我有一个名为的数据库表Categories.我想创建一个包含db中所有类别的表单下拉列表.我的解决方案是创建一个关联数组并将其添加到form_dropdown()函数的第二个参数中.我的结果是一个不需要的多维数组.

模型:

function list_categories()
    {
        $user_id = $this->tank_auth->get_user_id();

        $this->db->where('user_id', $user_id);
        $this->db->order_by("date_created", "desc");
        $query = $this->db->get('categories');
        return $query;      
    }

视图:

//create array
$categories = array();

if ($query->num_rows() > 0) 
{
     $categories = $query->result_array();
}

//create dropdown
echo form_dropdown('category', $categories, $date_created); //selected value based date created

代码给出了一个多维数组

Array ( 
[0] => Array ( [cat_id] => 27 [user_id] => 3 [cat_title] => Some Title [status] => 0 [date_created] => 2012-06-22 18:48:14 ) 

[1] => Array ( [cat_id] => 24 [user_id] => 3 [cat_title] => Title [status] => 0 [date_created] => 2012-06-20 19:37:47 ) 

[2] => Array ( [cat_id] => 23 [user_id] => 3 [cat_title] => Another Title [status] => 0 [date_created] => 2012-06-20 18:25:45 ) 

etc...

如何用关联数组替换上面的结果,其中ID键是类别ID并且值为类别标题？

例:

$categories = array(
    "23" => "some title",
    "14" => "another title",
);

Answer 1

解决方案的例子:

$categories=array(
'0'=>array("cat_id"=>"27","cat_title"=>"some title"),
'1'=>array("cat_id"=>"24","cat_title"=>"Title"),
'2'=>array("cat_id"=>"23","cat_title"=>"Another Title"),
);

   foreach($categories as $catID=>$categoriesData){
        $finalArray[$categoriesData["cat_id"]]=$categoriesData;
   }

print_r($finalArray);


/*
OUTPUT

Array
(
    [27] => Array
        (
            [cat_id] => 27
            [cat_title] => some title
        )

    [24] => Array
        (
            [cat_id] => 24
            [cat_title] => Title
        )

    [23] => Array
        (
            [cat_id] => 23
            [cat_title] => Another Title
        )

)
*/