PHP循环和重建数组按值（主题）输出JSON

我有这个结果来自MYSQL; content_groups已经由TopicId订购的MYSQL返回。PHP循环和重建数组按值（主题）输出JSON

Array 
(
    [0] => Array 
     (
      [ContentGroupId] => 1 
      [TopicId] => 1 
      [TopicName] => Meditations 
      [ContentGroupName] => Guided Meditations 1 
     ) 

    [1] => Array 
     (
      [ContentGroupId] => 2 
      [TopicId] => 1 
      [TopicName] => Meditations 
      [ContentGroupName] => Guided Meditations 2 
     ) 

    [2] => Array 
     (
      [ContentGroupId] => 3 
      [TopicId] => 1 
      [TopicName] => Meditations 
      [ContentGroupName] => Guided Meditations 3 
     ) 

    [3] => Array 
     (
      [ContentGroupId] => 4 
      [TopicId] => 2 
      [TopicName] => Hypnosis 
      [ContentGroupName] => Hypnosis Programs 1 
     ) 

    [4] => Array 
     (
      [ContentGroupId] => 5 
      [TopicId] => 2 
      [TopicName] => Hypnosis 
      [ContentGroupName] => Hypnosis Programs 2 
     ) 

    [5] => Array 
     (
      [ContentGroupId] => 6 
      [TopicId] => 3 
      [TopicName] => Mindfulness 
      [ContentGroupName] => Mindfulness Guides 1 
     ) 

    [6] => Array 
     (
      [ContentGroupId] => 7 
      [TopicId] => 3 
      [TopicName] => Mindfulness 
      [ContentGroupName] => Mindfulness Guides 2 
     ) 

    [7] => Array 
     (
      [ContentGroupId] => 8 
      [TopicId] => 3 
      [TopicName] => Mindfulness 
      [ContentGroupName] => Mindfulness Guides 3 
     )

我通过这个尝试循环，所以我可以按主题和JSON编码组，看起来像这样：

topics: [ 
    { 
     TopicId: 1, 
     TopicName: Mediations, 
     content_groups: [ 
     { 
      ContentGroupId: 1, 
      TopicId: 1, 
      TopicName: "Mediations", 
      ContentGroupName: "Guided Meditations 1" 
     }, 
     { 
      ContentGroupId: 2, 
      TopicId: 1, 
      TopicName: "Mediations", 
      ContentGroupName: "Guided Meditations 2" 
     }, 
     { 
      ContentGroupId: 3, 
      TopicId: 1, 
      TopicName: "Mediations", 
      ContentGroupName: "Guided Meditations 3" 
     } 
     ] 
    }, 
    { 
     TopicId: 2, 
     TopicName: Hypnosis, 
     content_groups: [ 
     { 
      ContentGroupId: 4, 
      TopicId: 2, 
      TopicName: "Hypnosis", 
      ContentGroupName: "Hypnosis Programs 1" 
     }, 
     { 
      ContentGroupId: 5, 
      TopicId: 2, 
      TopicName: "Hypnosis", 
      ContentGroupName: "Hypnosis Programs 2" 
     } 
     ] 
    }, 
    { 
     TopicId: 3, 
     TopicName: Mindfulness, 
     content_groups: [ 
     { 
      ContentGroupId: 6, 
      TopicId: 3, 
      TopicName: "Hypnosis", 
      ContentGroupName: "Mindfulness Guides 1" 
     }, 
     { 
      ContentGroupId: 7, 
      TopicId: 3, 
      TopicName: "Hypnosis", 
      ContentGroupName: "Mindfulness Guides 2" 
     }, 
     { 
      ContentGroupId: 8, 
      TopicId: 3, 
      TopicName: "Hypnosis", 
      ContentGroupName: "Mindfulness Guides 3" 
     } 
     ] 
    } 
]

我原来只是做了一个独立的MYSQL电话，因为我通过每个主题环以获得相应的内容组，但随着主题的增长，这看起来效率低下，因为我可以更轻松地进行一次SQL调用以获取所有需要的内容组，然后通过相应的主题重新组织数组，但我正在努力弄清楚如何输出以获得期望的最终结果。

来源

2017-07-15 Jeff Solomon

代码：（Demo）

$array=[ 
    ['ContentGroupId'=>1,'TopicId'=>1,'TopicName'=>'Meditations','ContentGroupName'=>'Guided Meditations 1'], 
    ['ContentGroupId'=>2,'TopicId'=>1,'TopicName'=>'Meditations','ContentGroupName'=>'Guided Meditations 2'], 
    ['ContentGroupId'=>3,'TopicId'=>1,'TopicName'=>'Meditations','ContentGroupName'=>'Guided Meditations 3'], 
    ['ContentGroupId'=>4,'TopicId'=>2,'TopicName'=>'Hypnosis','ContentGroupName'=>'Hypnosis Programs 1'], 
    ['ContentGroupId'=>5,'TopicId'=>2,'TopicName'=>'Hypnosis','ContentGroupName'=>'Hypnosis Programs 2'], 
    ['ContentGroupId'=>6,'TopicId'=>3,'TopicName'=>'Mindfulness','ContentGroupName'=>'Mindfulness Guides 1'], 
    ['ContentGroupId'=>7,'TopicId'=>3,'TopicName'=>'Mindfulness','ContentGroupName'=>'Mindfulness Guides 2'], 
    ['ContentGroupId'=>8,'TopicId'=>3,'TopicName'=>'Mindfulness','ContentGroupName'=>'Mindfulness Guides 3'] 
]; 
foreach($array as $a){ 
    if(!isset($grouped[$a['TopicId']])){ 
     $grouped[$a['TopicId']]=array_slice($a,1,2); // write TopicID & TopicName just once to group 
    } 
    $grouped[$a['TopicId']]['content_groups'][]=$a; // write all elements to content_groups 
} 
$grouped=['topics'=>array_values($grouped)]; // reindex temp keys and nest inside topics element 
var_export(json_encode($grouped));

输出：

'{"topics":[{"TopicId":1,"TopicName":"Meditations","content_groups":[{"ContentGroupId":1,"TopicId":1,"TopicName":"Meditations","ContentGroupName":"Guided Meditations 1"},{"ContentGroupId":2,"TopicId":1,"TopicName":"Meditations","ContentGroupName":"Guided Meditations 2"},{"ContentGroupId":3,"TopicId":1,"TopicName":"Meditations","ContentGroupName":"Guided Meditations 3"}]},{"TopicId":2,"TopicName":"Hypnosis","content_groups":[{"ContentGroupId":4,"TopicId":2,"TopicName":"Hypnosis","ContentGroupName":"Hypnosis Programs 1"},{"ContentGroupId":5,"TopicId":2,"TopicName":"Hypnosis","ContentGroupName":"Hypnosis Programs 2"}]},{"TopicId":3,"TopicName":"Mindfulness","content_groups":[{"ContentGroupId":6,"TopicId":3,"TopicName":"Mindfulness","ContentGroupName":"Mindfulness Guides 1"},{"ContentGroupId":7,"TopicId":3,"TopicName":"Mindfulness","ContentGroupName":"Mindfulness Guides 2"},{"ContentGroupId":8,"TopicId":3,"TopicName":"Mindfulness","ContentGroupName":"Mindfulness Guides 3"}]}]}'

来源

2017-07-15 22:56:23 mickmackusa

谢谢@mickmackusa我正在敲我的头......这似乎是一个非常干净的方式来做到这一点;比我一直试图去做的代码少得多。 –

-1

虽然循环通过MySQL查询结果创建阵列然后使用json_encode该阵列

$query= mysqli_query("SELECT ..."); 
$rows = array(); 
while($result = mysqli_fetch_assoc($query)) { 
$rows[] = $result; 
} 
print json_encode($rows);

来源

2017-07-15 21:29:36 Osama

这不会产生重新组织的结果，OP已经要求。 – mickmackusa

PHP循环和重建数组按值（主题）输出JSON

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