如何在PHP中的MySQLi選擇多列

我創建了一個表消息有柱USER_ID，message_sender，message_receiver，message_receiver_id如何在PHP中的MySQLi選擇多列

查詢，如下

線1的結果：2 ABOL阿狼3

第2行：2 ABOL MAK 4

3號線：3阿朗ABOL 2

線路4：3阿郎麥4

我希望顯示有阿狼記錄是1,3,4號線所有查詢。我設法只顯示一行3,4但不能顯示1行，這裏的代碼

<?php 
    include("includes/connections.php"); 
    function displaymessagesprofile(){ 
     global $connect; 
     global $user_id; 

      $get_id  = $_GET['message_receiver_id']; 
      $sql_message = "SELECT * FROM messages WHERE user_id='$user_id' OR message_receiver_id='$get_id'"; 
      $get_message = mysqli_query($connect, $sql_message); 

      if($get_message && mysqli_num_rows($get_message) > 0){ 
       while($row_message = mysqli_fetch_array($get_message)){ 

       $user_id   = $row_message['user_id']; 
       $message_sender  = $row_message['message_sender']; 
       $message_receiver = $row_message['message_receiver']; 
       $message_receiver_id= $row_message['message_receiver_id']; 

         //to display message sent and received by the user logged in 
         echo "<div id='message_wrap'> 
            <p>$message_sender</p> 
            <p>$message_receiver</p> 
            <p>$message_receiver_id</p> 
           </div> 
           "; 
       } 
      mysqli_free_result($get_message); 
      } 
      else{ 
       echo "No message yet"; 
      } 
    } 
?>

錯誤下面顯示：

注意：未定義指數：message_receiver_id

來源

2016-10-21 Jamilah

你確定你有'message_receiver_id'變量我你的網址？ – Irvin

是的。當然。未定義的索引。我不知道爲什麼 – Jamilah

行$ get_id = $ _GET ['message_receiver_id']; – Jamilah

$get_id  = $_GET['message_receiver_id']; 

change to 

$get_id  = isset($_REQUEST['message_receiver_id']) ? $_REQUEST['message_receiver_id'] : '';

你可能需要使用filter_var消毒

來源

2016-10-21 01:39:14 Chaoyenpo

錯誤消失了。但$ get_id仍然沒有顯示在結果中。 – Jamilah

哦對不起。是工作。謝謝：D。 – Jamilah

記得要消毒，最基本的方法是filter_var – Chaoyenpo

如何在PHP中的MySQLi選擇多列

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