如何从每两个用户对话中获取最后一条消息-解网

问：

我正在创建消息对话脚本，我想从每两个用户的对话中获取最后一条消息。MY 脚本显示所有from_id消息。任何人都可以帮助我，我尝试过很多。

我的数据库 pm 表结构

id  from_id    to_id     msg               sent_date
1   2          3         hi how are you?   2019-12-05 04:14:20
2   3          2         fine              2019-12-05 05:15:58
3   2          3         hi                2019-12-05 03:20:34
4   5          2         hi                2019-12-05 08:30:40

这是我的源代码

<?php
require_once "config.php";
if (isset($_SESSION['userid'])) {
    $to_id = $_SESSION['userid'];
}
if ($stmt = $con->prepare("SELECT * from pm where to_id=? or from_id=?  ")) {
    $stmt->bind_param('ss', $to_id, $from_id);
    $stmt->execute();
}
$result = $stmt->get_result();
if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {
        ?>

<?php echo $row['msg']; ?>

<?php
    }
} else {
    echo "NO MESSAGES";
}

?>

PHP 会话 mysqli

$sessionId = <session id variable>;

if ($stmt = $con->prepare("SELECT * FROM pm WHERE from_id = ? OR to_id = ? ORDER BY sent_date DESC")) {
    $stmt->bind_param('ii', $sessionId, $sessionId);
    $stmt->execute();
}



$tempArray = array();

$result = $stmt->get_result();

if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {

      if (!in_array($row['to_id'].$row['from_id'], $tempArray)) {
        echo "<br>";
        echo $row['from_id']." - " . $row['to_id']." ". $row['msg']. " - " .$row['sent_date'];
      }

      array_push($tempArray, $row['from_id'].$row['to_id']);
      array_push($tempArray, $row['to_id'].$row['from_id']);


    }
} else {
    echo "NO MESSAGES";
}

每次对话中每条消息的图像：

如何从每两个用户对话中获取最后一条消息

How to get last message from every two users conversation

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