PHP：按字母順序將數據拆分爲

Question

我的應用程序中有以下代碼，它將按字母順序顯示主題列表，並按每個區塊中的第一個標記名稱分割它們。

例如：

A 
animal 
amazing 

B 
bat 
baseball 

的代碼如下：

<?php 

    foreach($topics as $currentTopic): 
     $thisLetter = strtoupper($currentTopic['Topic']['title'][0]); 
     $sorted[$thisLetter][] = $currentTopic['Topic']['title']; 
     unset($thisLetter); 
    endforeach; 

    foreach($sorted as $key=>$value): 

     echo '<h3 class="alpha"><span>'.$key.'</span></h3>'; 
     echo '<ol class="tags main">'; 

     foreach($value as $thisTopic): 

      echo '<li class="tag"><em>0</em>'; 
      echo $this->Html->link('<strong>'.$thisTopic['Topic']['title'].'</strong>', 
         array('controller'=>'topics','action'=>'view','slug'=>$thisTopic['Topic']['slug']), 
         array('escape'=>false,'rel'=>'tag')); 
      echo '</li>'; 
     endforeach; 

     echo '</ol>'; 

    endforeach; 

    ?> 

然而，由於我現在有分裂陣列，我發現很難訪問陣列等中的其它數據作爲鏈接使用的主題slug作爲$ thisTopic變量只是存儲標題和其他所需的數據。我也想展示TopicPost在<em>算，因此，如果一個主題有4個相關帖子顯示<em>4</em>

目前國內做我在做什麼給出了錯誤：Fatal error: Cannot use string offset as an array，因爲我已經分裂陣列...

任何人都可以幫忙嗎？

如果我調試$主題數組我得到如下：

array(
    (int) 0 => array(
     'Topic' => array(
      'id' => '5', 
      'title' => 'amazing', 
      'slug' => 'amazing' 
     ), 
     'TopicPost' => array(
      (int) 0 => array(
       'id' => '9', 
       'topic_id' => '5', 
       'post_id' => '101' 
      ) 
     ) 
    ), 
    (int) 1 => array(
     'Topic' => array(
      'id' => '4', 
      'title' => 'amazingness', 
      'slug' => 'amazingness' 
     ), 
     'TopicPost' => array(
      (int) 0 => array(
       'id' => '8', 
       'topic_id' => '4', 
       'post_id' => '100' 
      ), 
      (int) 1 => array(
       'id' => '12', 
       'topic_id' => '4', 
       'post_id' => '101' 
      ), 
      (int) 2 => array(
       'id' => '4', 
       'topic_id' => '4', 
       'post_id' => '119' 
      ) 
     ) 
    ),... 

Answer 1

你得到的錯誤，因爲你只存儲主題的標題。

我建議存儲整個話題的信息，而不僅僅是標題：

$orderedTopics= array(); 
foreach ($topics as $topic) { 
    $orderedTopics[strtoupper($topic['Topic']['title'][0])][] = $topic; 
} 

然後，以顯示它：

foreach ($orderedTopics as $section=>$topics) { 
    echo $section; 
    foreach ($topics as $topic) { 
    echo 'Title: ' . $topic['Topic']['title']; 
    echo 'Body: ' . $topic['Topic']['body']; 
    //etc... 
    } 
}