Question

这是我的第一篇文章，因为我一直在努力寻找自己的方式，但我的大脑即将爆炸，在此之前我会非常感谢你的帮助。我有一个while循环输出所需的数据，但在while循环中我想检查session user == user_id，如果该语句为true，那么我想在循环中添加一个链接，以便用户可以编辑他们的帖子。我已经尝试了很多变化，有太多的列表（一些接近，其他是灾难）这是我目前的不正确，但真的很感激一些建议。起初我将我的if calc嵌入到我的回声中，令我惊讶地认识到列表创建者，但我的循环的其余部分将失败，所以现在我尝试在回声之前将其添加为$ IsUser然后在内部调用该函数回声，但这也不起作用。如果这是基本的东西，或者我的思维过程完全偏离，我道歉。

<?php
// CONNECT TO THE DATABASE
include_once("../php_includes/db_conx.php");
//Run a select query
$result = mysqli_query($db_conx,"SELECT listing.user_id, listing.id, users.username,     listing.date_created, listing.status, listing.category, listing.country, listing.date_deadline, listing.date_start, listing.title, listing.description
FROM listing
INNER JOIN users
ON listing.user_id=users.id
ORDER BY date_created DESC");

//Is User listing creator
//$isUser = "no";
if($string1==$string2){
    $isUser = '<a href="listing_add.php?id='. $row['id'] .'">Edit Listing</a>';
}

//Run listing loop
while($row = mysqli_fetch_array($result))
$string1 = $row['user_id'];
$string2 = $_SESSION['userid'];
  {
  echo '
    <div id=listings>
    <div id=img><br>No image to display</div>
        <div id=row>
            <div id=title><a href="listing_disp.php?id='. $row['id'] .'">'. $row['title'] .'</a></div>  
        </div>
        <div id=row>
            <div id=description>'. $row['description'] .'</div>
            <div id=created>Added: '. date('jS M Y',strtotime($row['date_created'])) .'</div>
            <div id=deadline>Deadline: '. date('jS M Y',strtotime($row['date_deadline'])) .'</div>
            <div id=category>Category: <a href="index.php?'. $row['category'].'">'. $row['category'] .'</a></div>   
            <div id=user>User: &nbsp;<a href="index.php?'. $row['user_id'].'">'. $row['username'].'</a> </div>      
        </div>
        <div id=row>
        <div id=edit>'.$isUser.'</div>
            <div id=country>'. $row['country'] .'</div>


        </div>
  </div>
  ';
  }
mysqli_close($con);
?>

Answer 1

从页面顶部删除条件并尝试按照

while($row = mysqli_fetch_array($result)){
    $string1 = $row['user_id'];
    if($string1 == $_SESSION['userid'])
      {
        $isUser = '<a href="listing_add.php?id='. $row['id'] .'">Edit Listing</a>';
      }else{
        $isUser = '';
      }
      echo '
        <div id=listings>
        <div id=img><br>No image to display</div>
            <div id=row>
                <div id=title><a href="listing_disp.php?id='. $row['id'] .'">'. $row['title'] .'</a></div>  
            </div>
            <div id=row>
                <div id=description>'. $row['description'] .'</div>
                <div id=created>Added: '. date('jS M Y',strtotime($row['date_created'])) .'</div>
                <div id=deadline>Deadline: '. date('jS M Y',strtotime($row['date_deadline'])) .'</div>
                <div id=category>Category: <a href="index.php?'. $row['category'].'">'. $row['category'] .'</a></div>   
                <div id=user>User: &nbsp;<a href="index.php?'. $row['user_id'].'">'. $row['username'].'</a> </div>      
            </div>
            <div id=row>
            <div id=edit>'.$isUser.'</div>
                <div id=country>'. $row['country'] .'</div>


            </div>
      </div>
      ';
    }
    mysqli_close($con);

Answer 2

你需要把它放在里面，同时在你的代码中，{在while之后放错了。

由于$string2保持不变，您可以在循环外定义它，但不能对$string1执行相同操作，因为它需要来自$row的当前数据

$string2 = $_SESSION['userid'];
while($row = mysqli_fetch_array($result)) {
    $string1 = $row['user_id'];
    if ($string1==$string2) { /* do what you have to do */ }
    // output
}

Answer 3

您需要将if语句放在while循环中。另请注意，我将您的ID更改为类您不想回显DOM中的重复ID 。

我还将您的变量从$isUser重命名为$editLink，确保将其清除以用于后续循环迭代。

while ($row = mysqli_fetch_array($result)) {
    if ($row['user_id'] == $_SESSION['userid'] {
        $editLink = '<a href="listing_add.php?id=' . $row['id'] . '">Edit Listing</a>';
    } else {
        $editLink = '';
    }

    echo '
    <div class="listings">
    <div class=lsitings-img"><br />No image to display</div>
        <div class="listings-row">
            <div class="listings-title"><a href="listing_disp.php?id='. $row['id'] .'">'. $row['title'] .'</a></div>  
        </div>
        <div class="listings-row">
            <div class="istings-row-description">'. $row['description'] .'</div>
            <div class="istings-row-created">Added: '. date('jS M Y',strtotime($row['date_created'])) .'</div>
            <div class="istings-row-deadline">Deadline: '. date('jS M Y',strtotime($row['date_deadline'])) .'</div>
            <div class="istings-row-category">Category: <a href="index.php?'. $row['category'].'">'. $row['category'] .'</a></div>   
            <div class="istings-row-user">User: &nbsp;<a href="index.php?'. $row['user_id'].'">'. $row['username'].'</a> </div>      
        </div>
        <div class="listings-row">
            <div class="listings-edit">' . $editLink . '</div>
            <div class="listings-country">' . $row['country'] . '</div>
        </div>
  </div>
  ';
}

如何在数组和回声中处理If语句

3 个答案: