OICQ
根据许多网友需求,特地把我站的这个模拟 OICQ 的在线聊天的东西献给大家!1 用户必须注册登陆,在数据库 userinfo 里面保存如下几个字段
Name 不用问了,这是登陆用的用户名,必须唯一
Password 登陆密码
NickName 用户昵称,也就是显示的名字
Face 存放着用户头像的编号,比如 01,代表 /images/face/01.gif 头像文件
OnlineStatus 用户是否在线的标志,在用户登陆的时候设置为 1
CurrentDate 用户最后访问/更新的时间,用于判断用户是否在线
聊天纪录 forumtalk 的结构为
CREATE TABLE forumtalk (
id int(11) NOT NULL auto_increment,
sender varchar(20) NOT NULL,
receiver varchar(20) NOT NULL,
date int(11) DEFAULT '0' NOT NULL,
readsign tinyint(4) DEFAULT '0' NOT NULL,
body varchar(200) NOT NULL,
PRIMARY KEY (id),
UNIQUE id_2 (id),
KEY id (id)
);
其中 sender 是发送人的 Name
receiver 是接受人的 Name
date 是发言的时间
readsign 发言是否已经阅读过
body 发言内容
2 显示在线用户的头像
$onlineresult = mysql_query("select Name,NickName,Face,EnterTimes from userinfo where OnlineStatus=1 and CurrentDate >".(date("U")-120));
$onlinenumber = mysql_num_rows($onlineresult);
echo "欢迎光临,共有:".$onlinenumber."位朋友在线,按头像发短信息:";
for($i=0;$i {
if(!$onlineuser = mysql_fetch_array($onlineresult))break;
echo "
echo " title='代号:".$onlineuser['Name']."\n昵称:".$onlineuser['NickName']."\n来访:".$onlineuser['EnterTimes']."'>";
}
?>
其中的 onClick 用于弹出发送消息的对话窗口,大家可以在网页的源代码里面看到

PHP remains important in modern web development, especially in content management and e-commerce platforms. 1) PHP has a rich ecosystem and strong framework support, such as Laravel and Symfony. 2) Performance optimization can be achieved through OPcache and Nginx. 3) PHP8.0 introduces JIT compiler to improve performance. 4) Cloud-native applications are deployed through Docker and Kubernetes to improve flexibility and scalability.

PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.

PHP and Python each have their own advantages and are suitable for different scenarios. 1.PHP is suitable for web development and provides built-in web servers and rich function libraries. 2. Python is suitable for data science and machine learning, with concise syntax and a powerful standard library. When choosing, it should be decided based on project requirements.

PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7

The reasons why PHP is the preferred technology stack for many websites include its ease of use, strong community support, and widespread use. 1) Easy to learn and use, suitable for beginners. 2) Have a huge developer community and rich resources. 3) Widely used in WordPress, Drupal and other platforms. 4) Integrate tightly with web servers to simplify development deployment.

PHP remains a powerful and widely used tool in modern programming, especially in the field of web development. 1) PHP is easy to use and seamlessly integrated with databases, and is the first choice for many developers. 2) It supports dynamic content generation and object-oriented programming, suitable for quickly creating and maintaining websites. 3) PHP's performance can be improved by caching and optimizing database queries, and its extensive community and rich ecosystem make it still important in today's technology stack.

In PHP, weak references are implemented through the WeakReference class and will not prevent the garbage collector from reclaiming objects. Weak references are suitable for scenarios such as caching systems and event listeners. It should be noted that it cannot guarantee the survival of objects and that garbage collection may be delayed.

The \_\_invoke method allows objects to be called like functions. 1. Define the \_\_invoke method so that the object can be called. 2. When using the $obj(...) syntax, PHP will execute the \_\_invoke method. 3. Suitable for scenarios such as logging and calculator, improving code flexibility and readability.


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