如果没有添加用户，如何从聊天中添加用户

问题描述 投票：-1回答：1

我有网络聊天。用户可以添加自己的聊天。我想制作按钮，如果聊天不是他的，他可以加入，但有问题。我有加入聊天的用户表，所以如果用户加入了一些聊天，则在“加入”表中插入已加入的用户ID和聊天ID。

如果用户再按一次“加入”按钮，他将从此聊天中删除。但在我的代码是这样，用户按加入他加入聊天，但当他再按一次加入时，他没有从聊天中删除它需要如何再次插入这个聊天但是当他点击第三次时他删除了聊天

<?php
session_start();

		$sql="select * from joined order by id desc";
		$data=$db->prepare($sql);
		$data->execute();
		$joined=$data->fetchAll();
?>



<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width">
	<title>chat-room</title>
</head>
<body>


		 
   
	
<?php
if ($rows['username'] != $_SESSION["username"]) {
	?>
	
	<?php
}
?>

<form method="post">
<div class="none" style="display:none">

			<?php
	  if($joined){
		 foreach($joined as $join){
	?>

<input type="text" name="joined_id" value="<?php echo $join['id'];?>">

<?php
		 }
		}
?>
</div>
<input type="submit" name="joinChatRoom" id="joinChatRoom" value="Вступить в чат-комнату">

</form>
	


   <?php
		if(isset($_POST['joinChatRoom'])) {
		
			
		if (isset($_GET['ID'])){
	
			$joined_id = $_POST['joined_id'];
			$stmt = $db->prepare('SELECT * FROM joined WHERE ID=?');
			$stmt->bindParam(1, $joined_id, PDO::PARAM_INT);
			$stmt->execute();
			$row = $stmt->fetch(PDO::FETCH_ASSOC);
			
			if($row)
			{
				$joined_id = $_POST['joined_id'];	
				$pdoQuery = "DELETE FROM `joined` WHERE id = :id";
				$pdoResult = $db->prepare($pdoQuery);
				$pdoExec = $pdoResult->execute(array(":id"=>$joined_id));
			
			}

		else {
			$id=$_GET['ID'];
			$userId = $_SESSION['user_id'];
				$sql = 'INSERT INTO joined (user_id, chat_id) VALUES (?, ?)';
$query = $db->prepare($sql);
$query->execute([$userId, $id]);
			}
		}
		}
	

?>
php forms session pdo
1个回答
-1
投票

我已经更新了我的答案。这肯定会解决问题

<?php
session_start();
$_SESSION["user_id"] = 4;
?>
<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width">
	<title>chat-room</title>
</head>
<body>

<?php
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "test";

$current_user = -1;
if(isset($_SESSION['user_id'])){
  $current_user = $_SESSION['user_id'];
}
else{
  die("Invalid Session!");
}

//Declare button text. Should not contain underscores('_').
$possible_actions=array("Join Me","Leave");

try {
    $db = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
    // set the PDO error mode to exception
    $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    if(isset($_POST['joinChatRoom'])) {            
        if (isset($_POST['chat_action'])){
            $action_info = explode("_",$_POST['chat_action']);
            $action_text = $action_info[0];
            $chat_id = (int)$action_info[1];
            
            if(strcmp($action_text,$possible_actions[1])==0)
            {
                $pdoQuery = "DELETE FROM join_chat_user WHERE chat_id=:chat_id AND user_id=:user_id";
                $pdoResult = $db->prepare($pdoQuery);
                $pdoExec = $pdoResult->execute(array(":chat_id"=>$chat_id,":user_id"=>$current_user));
                echo "You left!";
            
            }else {
                // prepare sql and bind parameters
                $stmt = $db->prepare("INSERT INTO join_chat_user (chat_id, user_id) VALUES (:chat_id, :user_id)");
                $stmt->bindParam(':chat_id', $chat_id);
                $stmt->bindParam(':user_id', $current_user);
                $stmt->execute();
                echo "You joined!";
            }
        }
    }else if(isset($_POST['addChatRoom'])){
        $sql="select count(DISTINCT(chat_id)) As 'class_count' from join_chat_user";
        $data=$db->prepare($sql);
        $data->execute();
        $count=(int)$data->fetch(PDO::FETCH_ASSOC)['class_count'];
        $count++;
        $stmt = $db->prepare("INSERT INTO join_chat_user (chat_id, user_id) VALUES (:chat_id, :user_id)");
        $stmt->bindParam(':chat_id', $count);
        $stmt->bindParam(':user_id', $current_user);
        $stmt->execute();
        echo "New chat created. You joined the new chat-$count!";
    }
    
    $sql="select chat_id,user_id from join_chat_user order by chat_id desc";
    $data=$db->prepare($sql);
    $data->execute();
    $joined=$data->fetchAll();
    $unique_chats = array();
    for($i=0;$i<sizeof($joined);$i++){
        if(!in_array($joined[$i]['chat_id'],$unique_chats)){
            array_push($unique_chats,$joined[$i]['chat_id']);
        }
    }
    ?>
    <form method="post">
    <table border="0">
    <thead>
        <tr>
            <th>Chat ID</th>
            <th>Action</th>
        </tr>
    </thead>
    <tbody>
    <?php
    foreach($unique_chats as $chat_id){
        $action_text=$possible_actions[0];
        $joined_users=array();
        foreach($joined as $record){
            if($record['chat_id']==$chat_id){
                array_push($joined_users,$record['user_id']);
            }
        }
        
        if(in_array($current_user,$joined_users)){
            $action_text=$possible_actions[1];
        }
        ?>
        <tr>
        <td><?php echo $chat_id; ?></td>
        <td><input type="radio" name="chat_action" value="<?php echo $action_text . "_" . $chat_id; ?>"><?php echo $action_text; ?></button></td>   
        </tr>
        <?php
    }
    ?>
    </tbody>
    </table>
<input type="submit" name="joinChatRoom" id="joinChatRoom" value="Вступить в чат-комнату">
<input type="submit" name="addChatRoom" id="addChatRoom" value="Add New Chat Room">
</form>
<?php
    
}
catch(PDOException $e)
    {
    echo $sql . "<br>" . $e->getMessage();
    }

$conn = null;
?>

这是它出现的方式。

user tries to join chat

after you join some chat

after you leave some chat

in case you create a new chat

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