嵌套如果陳述在Foreach

Question

我試圖自動排除我的博客中有負面投票的條目（< 0）。以下是我使用的代碼，但它不排除，不斷顯示博客的反對票。 （在現在公示制度，讓您的幫助可能無法答覆，直到後來，但是，謝謝！）

$id = $_GET['id']; // get initial query from index 

      $table = 'txt'; 
      $item = 'vt_' .$table.($_GET['id']); 

      $db = new PDO('mysql:host=localhost;dbname=db;charset=utf8', 'user', 'pass'); 

$sql = $db->query('SELECT * from txt ORDER BY ID DESC LIMIT 10 OFFSET '.$browse); 


$stmt = $db->prepare('SELECT vote FROM voting where item = ?'); 
($stmt->execute(array($item))); 
($vrow = $stmt->fetch(PDO::FETCH_ASSOC)); 

      foreach ($sql as $row) { 
      if ($vrow['vote'] < 0){ 
       echo "<b>Update:</b><br>"; 
       echo "<font color = 'red'><i>", "This Update,", "</i></font>", "<br>"; 
       echo "By: ", ($row['username']), "<br>"; 
       echo "At: ", ($row['timestamp']), "<br>"; 
       echo "<font color = 'red'><i>Has been</i> <b>Voted Out</b></font>", "<br>"; 
       echo "<span class='loginnotreq'>", "<b>", ($row['edited']), "</b>", "&nbsp;", "&nbsp;", "<span 

class='loginreq'>", "<b>", ($row['locked']), "</b>", "</span>", "</span>"; 
       echo "&nbsp;", "&nbsp;"; 
       if($row['locked'] !='locked'){ 
       echo "&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 

&nbsp;&nbsp;<a href ='edit-post-login.php?pid=".$row['id']."&login=true&edit=true' method='post' id ='form-id' 

data-ajax='false' '><b><span class = 'neutral'>edit post</span></b></a>";} 

       echo "&nbsp;", "&nbsp;"; 


       echo "<div class='vot_updown2' id=" . 'vt_' .$table.($row['id']). "></div><br>";    
       } 
       else { 
       echo "<b>Update:</b><br>"; 
       echo ($row['message']), "<br>"; 
       echo "By: ", ($row['username']), "<br>"; 
       echo "At: ", ($row['timestamp']), "<br>";    
       echo "<span class='loginnotreq'>", "<b>", ($row['edited']), "</b>", "&nbsp;", "&nbsp;", "<span 

class='loginreq'>", "<b>", ($row['locked']), "</b>", "</span>", "</span>"; 
       echo "&nbsp;", "&nbsp;"; 
       if($row['locked'] !='locked'){ 
       echo "&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 

&nbsp;&nbsp;<a href ='edit-post-login.php?pid=".$row['id']."&login=true&edit=true' method='post' id ='form-id' 

data-ajax='false' '><b><span class = 'neutral'>edit post</span></b></a>";} 

       echo "&nbsp;", "&nbsp;"; 


       echo "<div class='vot_updown2' id=" . 'vt_' .$table.($row['id']). "></div><br>"; 
       } 

       } 

Answer 1

簡單的答案（不復制和粘貼所有的代碼）：

foreach($row as $post) { 
    if($post['rating'] >= 0) { 
    //do something 
    } 
} 

Answer 2

你只需改變你的查詢只帶票等於或大於零返回行：

例如：

SELECT vote FROM voting where item = ? and vote >= 0 

這樣你就不需要循環中的條件。您只需要處理大於或等於零的投票部分。

Answer 3

解析值INT當它來自DB，因爲它通常是在字符串的形式：

if ((int)$vrow['vote'] < 0){ ...