如何只有當條件爲真

我寫了這個代碼創建HTML：如何只有當條件爲真

<div class="col-md-4" id="message_widget"> 
      <div class="card"> 
       <div class="card-header"> 
        Latest messages 
        <?php 
        $query = $database->getConnection()->prepare('SELECT count(id) FROM messages WHERE messageRead = 0 AND messageTrash = 0 AND userId = ?'); 
        $query->bind_param('i', $id); 
        if($database->getData($query)[0] > 0){ 
         $messageNumber = $database->getData($query)[0]; 
         echo "<span class='badge badge-danger badge-pill pull-right'>$messageNumber</span>"; 
        } 
        ?> 

       </div> 
       <div class="card-block"> 
        <table class='table' id="table"> 
         <?php 

         $messageStatement = $database->getConnection()->prepare("SELECT * FROM messages WHERE userId=? AND messageDeleted = 0 AND messageTrash = 0 AND messageRead= 0 ORDER BY time_added LIMIT 3"); 

         $messageStatement->bind_param('i', $id); 

         $latestMessages= $database->getDataAsArray($messageStatement); 

         if(!$latestMessages){ 
          echo "<tr><td colspan='2' style='text-align: center'>No new unread messages</td> </tr>"; 
         } 
         foreach($latestMessages as $message){ 
          $time_added = $message['time_added']; 
          $number = $message['id']; 
          $subject = $message['subject']; 
          echo "<tr> 
            <td><a href='showMessage.php?id=$number'>$subject</a></td> 
            <td>$time_added</td> 
            </tr>"; 
         } 
         ?> 
        </table> 
       </div> 
      </div> 
     </div>

我只想在頁面如果某個條件爲真，以建立這個COL-MD-6。在其他情況下，它不應該被構建。 JavaScript不是一個選項，這給我一個奇怪的效果，我不想（構建頁面，然後添加或刪除項目）

我知道，當代碼只有HTML，我可以很容易地通過PHP回顯代碼，如果條件是真的，但是當條件成立時，我如何創建上面的代碼？

來源

2017-08-27 Sander bakker

如果你寫的代碼，你應該能夠回答自己的問題。我認爲你需要更加努力。 –

'if（certainCondition）{doSomething（）}' –

嘗試這種使用<?php if(): ?>---<?php endif; ?> 這就是所謂另類syntaxesee this

<?php if(condition == true): ?> 
 
<div class="col-md-4" id="message_widget"> 
 
      <div class="card"> 
 
       <div class="card-header"> 
 
        Latest messages 
 
        <?php 
 
        $query = $database->getConnection()->prepare('SELECT count(id) FROM messages WHERE messageRead = 0 AND messageTrash = 0 AND userId = ?'); 
 
        $query->bind_param('i', $id); 
 
        if($database->getData($query)[0] > 0){ 
 
         $messageNumber = $database->getData($query)[0]; 
 
         echo "<span class='badge badge-danger badge-pill pull-right'>$messageNumber</span>"; 
 
        } 
 
        ?> 
 

 
       </div> 
 
       <div class="card-block"> 
 
        <table class='table' id="table"> 
 
         <?php 
 

 
         $messageStatement = $database->getConnection()->prepare("SELECT * FROM messages WHERE userId=? AND messageDeleted = 0 AND messageTrash = 0 AND messageRead= 0 ORDER BY time_added LIMIT 3"); 
 

 
         $messageStatement->bind_param('i', $id); 
 

 
         $latestMessages= $database->getDataAsArray($messageStatement); 
 

 
         if(!$latestMessages){ 
 
          echo "<tr><td colspan='2' style='text-align: center'>No new unread messages</td> </tr>"; 
 
         } 
 
         foreach($latestMessages as $message){ 
 
          $time_added = $message['time_added']; 
 
          $number = $message['id']; 
 
          $subject = $message['subject']; 
 
          echo "<tr> 
 
            <td><a href='showMessage.php?id=$number'>$subject</a></td> 
 
            <td>$time_added</td> 
 
            </tr>"; 
 
         } 
 
         ?> 
 
        </table> 
 
       </div> 
 
      </div> 
 
     </div> 
 
<?php endif; ?>

來源

2017-08-27 10:31:15 M0ns1f

如何只有當條件爲真

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