Question

我写了这个查询以获取详细信息，但它不起作用。这是我的代码：

$sender_id=$_GET['sender_id'];
$sender_id=mysqli_real_escape_string($con,$sender_id);
$sender_id=htmlentities($sender_id);
$sql1="SELECT * FROM massges where receiver_id='".$_SESSION['u_id']."' and sender_id='".$sender_id."' order by msg_id";
$sql2="SELECT * FROM massges where receiver_id='".$sender_id."' and sender_id='".$_SESSION['u_id']."' order by msg_id";
$sqls=[$sql1,$sql2];

foreach($sqls as $k => $sql){

$run=mysqli_query($con,$sql);

if (mysqli_num_rows($run)>0) {

while ($row=mysqli_fetch_assoc($run)) {

  $msg_text=$row['msg_text'];
  $msg_id=$row['msg_id'];

$query1="SELECT * FROM users where u_id='".$sender_id."'";

$query2="SELECT * FROM users where  u_id='".$_SESSION['u_id']."'";

$querys=[$query1,$query2];

foreach($querys as $k => $query){

$res=mysqli_query($con,$query);

while($data=mysqli_fetch_assoc($res)){

  $user_image=$data['user_image'];

}
echo '<br>
  <div class="row">
    <div class="col s2" style="margin: 0px;">
      <img src="users/'.$user_image.'" class="circle right" height="20px">
    </div>
    <div class="col s6"><span class=" blue lighten white-text" style="margin: 0px;border-radius: 10px;padding:5px;">'.$msg_text.'<span></div>
  </div>';}

以下是显示的数据： Result Image

如何显示发送者和接收者的消息？

Answer 1

您可以在一个查询中执行此操作，如果这样做，您的代码将更容易调试：

$sender_id = $_GET['sender_id'];
$user_id = $_SESSION['u_id'];

// Get all Messages where the user and sender are involved
$statement = $con->prepare('
    SELECT
        messages.msg_text,
        users.user_image
    FROM
        messages
    JOIN
        users ON users.u_id = messages.sender_id
    WHERE
        (
            messages.sender_id = ?
            AND messages.receiver_id = ?
        ) OR (
            messages.sender_id = ?
            AND messages.receiver_id = ?
        )
    ORDER BY
        messages.msg_id
');

$statement->bind_param(
    "iiii",
    $sender_id,
    $user_id,
    $user_id,
    $sender_id
);

$statement->execute();

// Assign the content of 'msg_text' and 'user_image'
$statement->bind_result($text, $image);

// loop through all results
while ($statement->fetch()) {
    /* ECHO YOUR HTML HERE */
    echo $text;
    echo $image;
}

可能有用的链接： http://php.net/manual/en/mysqli-stmt.bind-param.php http://php.net/manual/en/mysqli-stmt.bind-result.php

Answer 2

$sender_id = $_GET['sender_id'];
$user_id = $_SESSION['u_id'];
$sql="SELECT
    massges.msg_text,
    massges.msg_id,
    users.user_image
FROM
    massges
JOIN
    users ON users.u_id = massges.sender_id
WHERE
    (
        massges.sender_id = '".$sender_id."'
        AND massges.receiver_id = '".$user_id."'
    ) OR (
        massges.sender_id = '".$user_id."'
        AND massges.receiver_id = '".$sender_id."'
    )
ORDER BY
    massges.msg_id";
$run=mysqli_query($con,$sql);
if (mysqli_num_rows($run)>0) {
 while ($row=mysqli_fetch_assoc($run)) {
  $msg_id=$row['msg_id'];
  $msg_text=$row['msg_text'];
  $user_image=$row['user_image'];

  echo '<br>
  <div class="row">
    <div class="col s2" style="margin: 0px;">
      <img src="users/'.$user_image.'" class="circle right" height="20px">
    </div>
    <div class="col s6"><span class=" blue lighten white-text" style="margin: 0px;border-radius: 10px;padding:5px;">'.$msg_text.'<span></div>
  </div>'; }  }

如何使用PHP和MySQL显示用户聊天

2 个答案: