Message reading status and unread message reminder of PHP real-time chat system

Message reading status and unread message reminder of PHP real-time chat system

In modern social networks and instant messaging applications, message reading status and unread message reminder are Essential functionality. In the PHP real-time chat system, we can implement these functions through some simple codes. This article will introduce how to use PHP to implement the functions of message reading status and unread message reminder, and provide corresponding code examples.

1. Message reading status

First, we need to add a field to the message table in the database to represent the reading status of the message. We can use a Boolean field, such as unread, to indicate whether the message has been read.

When the user logs in to the chat system and views the chat record, we can set the unread field of all messages to false, indicating that these messages have been read by the user. When new messages are sent to the user, we set the unread field to true, indicating that these messages are unread.

The following is a sample code to update the unread field of the message to false:

// 定义消息ID $messageId = 消息ID; // 更新消息的unread字段为false $query = "UPDATE messages SET unread = false WHERE id = $messageId"; mysqli_query($con, $query);

Through the above code, we can update the corresponding unread field to false when the user reads the message. Thereby realizing the reading status function of the message.

2. Unread message reminder

In order to implement the unread message reminder function, we can use AJAX technology to send a request to the backend when the user opens the chat system page , get the number of unread messages.

The following is a sample code to obtain the number of unread messages:

// 获取未读消息的数量 $query = "SELECT COUNT(*) AS unreadMessages FROM messages WHERE recipient = '当前用户' AND unread = true"; $result = mysqli_query($con, $query); $row = mysqli_fetch_assoc($result); $unreadMessages = $row['unreadMessages']; // 返回未读消息的数量 echo $unreadMessages;

In the above code, we obtain the number of unread messages for the current user by querying the database and return the result to the front-end page.

In the front-end page, we can use JavaScript to receive and process the number of unread messages returned by the back-end, and then display the corresponding reminder.

The following is a sample code used to display unread message reminders on the front-end page:

// 发送AJAX请求，获取未读消息的数量 $.ajax({ url: 'getUnreadMessages.php', success: function(unreadMessages) { // 更新未读消息的数量 $('#unread-messages').text(unreadMessages); // 如果有未读消息，则显示消息提醒 if (unreadMessages > 0) { $('#message-reminder').show(); } } });

With the above code, we can obtain the unread messages when the user opens the chat system page. quantity and display corresponding reminders.

Summary:

Through the above code examples, we can implement the message reading status and unread message reminder functions of the PHP real-time chat system. Users can record the reading status of the message by marking the unread field of the message, and obtain the number of unread messages through AJAX technology and display the corresponding reminder. These features can improve the user experience, allowing users to receive and read new chat messages in a timely manner.

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