如何在php中创建一个多维数组？

Question

嗨，大家好我想创建一个多维数组作为格式波纹管，但我正在努力这样做，任何帮助将不胜感激。谢谢。

$movies = array(); 
    $sql = "SELECT u.username AS Username, group_concat(v.title) AS Video_title, group_concat(r.rate) AS Rating 
    FROM `rating` AS r 
    JOIN `uploads` AS v ON r.video_id = v.vid_id 
    JOIN `users` as u ON u.user_id = r.rater_id 
    GROUP by Username" ; 

    $query = mysqli_query($conn, $sql); 

    while($result = mysqli_fetch_assoc($query)){ 
    $movies[] = $result; 
    } 

    foreach($movies as $k => $v){ 
    unset($movies[$k]); 
    $movies[$v['Username']] = $v; 
    } 
    foreach($movies as $k => $v){ 
    unset($movies[$k]['Username']); 
    } 

    print_r($movies); 

这就是我目前得到：

 [user1] => Array ([Video_title] => Snakes on the Plane, 
             Superman Returns, 
             The Night Listner, 
             Lady in the Water, 
             Just my Luck, 
             You me and Dupree 
         [Rating] => 3.5, 
            3.5, 
            3, 
            2.5, 
            3, 
            2.5 
        )) 

但我的目标，以输出它的格式如下：

'user1' => 
      array('Lady in the Water' => 2.5, 
       'Snakes on a Plane' => 3.5, 
       'Just My Luck' => 3.0, 
       'Superman Returns' => 3.5, 
       'You, Me and Dupree' => 2.5, 
       'The Night Listener' => 3.0 
       ) 

Answer 1

你必须这样做象下面这样： -

$movies = array(); 
    $sql = "SELECT u.username AS Username, group_concat(v.title) AS Video_title, group_concat(r.rate) AS Rating 
    FROM `rating` AS r 
    JOIN `uploads` AS v ON r.video_id = v.vid_id 
    JOIN `users` as u ON u.user_id = r.rater_id 
    GROUP by Username" ; 
    $query = mysqli_query($conn, $sql); 

    while($result = mysqli_fetch_assoc($query)){ 
     $movies[] = $result; 
    } 

    $new_movies = array(); // a new array variable 

    foreach($movies as $k => $v){ 
     $array_keys = explode(',',$v['Video_title']); // explode Video_title string into array 
     $trimmed_array_key=array_map('trim',$array_keys); // trim all spaces from each value of $trimmed_array_key array 
     $array_values = explode(',',$v['Rating']); // explode Rating array 
     $trimmed_array_values=array_map('trim',$array_values);//remove all spaces from $trimmed_array_values array 
     $new_movies[$v['Username']] = array_combine($trimmed_array_key,$trimmed_array_values); // combine $trimmed_array_key array and $trimmed_array_values array and assign to corresponding user 
    } 


    echo "<pre/>";print_r($new_movies); // print new array 

注： -

这条线： - $trimmed_array_key=array_map('trim',$array_keys);

会做类似如下： -

https://eval.in/766605

参考： - http://php.net/manual/en/function.array-combine.php

Answer 2

更改以下行：

$movies[$v['Username']] = $v; 

到

$movies[$v['Username']][] = $v; 

并重试。它将在每个迭代的Username索引下创建一个新阵列。

Answer 3

试试这个代码，您的目标结果：

$movies = array(); 
    $sql = " 

    SELECT u.username AS Username, v.title AS Video_title, r.rate AS Rating 
    FROM `rating` AS r 
    JOIN `uploads` AS v ON r.video_id = v.vid_id 
    JOIN `users` as u ON u.user_id = r.rater_id 
    GROUP by Username" ; 

    $query = mysqli_query($conn, $sql); 

    while($result = mysqli_fetch_assoc($query)){ 
     $movies[$result['Username']][$result['Video_title']] = $result['Rating']; 
    } 

    print_r($movies);