PHP Socket function reference_PHP tutorial
这些Socket函数直接跟互联网的协议进行发送信息。相对于fopensock的流来讲,他们操作在一个比较底层的级别。通常,他们都是对C 函数进行封装,并且名称都类似。如果你有使用C进行socket编程的经验,那么使用这些函数将是非常熟练的。我们这里不讨论特别详细的socket编程。 bool socket_bind(resource socket, string address, integer port)
使用这些函数能够解决高层级别函数所不能解决的难题。使用这些函数能够实现类似fopen的功能,你也许有很多方法来实现socket的功能,比如在PHP中使用CLI(Command-line Interface)来实现的Internet守护进程。
resource socket_accept(resource socket)
在你的脚本服务器端中,使用socket_accept接受一个进入的连接。你必须首先产生一个socket,绑定它到一个名字,并且设置它监听一个端口。在块模式中,socket_accept将产生一个唯一接受后的连接。在非块模式中,它没有建立连接则返回false。另外,当你有了一个新的socket资源后就能够进行读写操作。
下面我们将示范一个简单的回显服务器端。它运行在CLI(命令行)下面,它在12345端口等待客户端的连接。
socket_accept
set_time_limit(0);
//create the socket
if(($socket = socket_create(AF_INET, SOCK_STREAM, 0)) print("Couldnt create socket: " . socket_strerror(socket_last_error()) . "
");
}
//bind it to the given address and port
if(($error = socket_bind($socket, gethostbyname($_SERVER[HOSTNAME]), 12345)) print("Couldnt bind socket: " . socket_strerror(socket_last_error()) . "
");
}
if(($error = socket_listen($socket, 5)) print("Couldnt list on socket: " .
socket_strerror(socket_last_error()) . "
");
}
while(TRUE){
//wait for connection
if(($accept = socket_accept($socket)) print("Error while reading: " . socket_strerror($message) . "
");
break;
}
//send welcome message
socket_write($accept, "Connection accepted
");
print(date(Y-m-d H:i:s) . " STATUS: Connection accepted
");
ob_flush();
while(TRUE){
//read line from client
if(FALSE === ($line = socket_read($accept, 1024))){
print("Couldnt read from socket: " .
socket_strerror(socket_last_error()) . "
");
break 2;
}
if(!@socket_write($accept, "ECHO: $line")){
print(date(Y-m-d H:i:s) . " STATUS: Connection interrupted
");
break;
}
print(date(Y-m-d H:i:s) . " READ: $line");
ob_flush();
}
socket_close($accept);
}
?>
This socket_bind() binds a socket resource to an address. This socket must be a resource returned by the socket_create() function. This address must be an IP address or a path to a Unix socket. If it is a socket running on the Internet, you must also provide a port.
socket_clear_error(resource socket)
This function can clear the errors of the specified socket. If no parameters are specified, all socket errors will be cleared.
socket_close(resource socket)
The socket_close function closes a socket and clears the memory resources occupied by the socket.
boolean socket_connect(resource socket, string address, integer port)
This function creates a client connection to a port or socket. You must provide a socket generated by socket_create. The address parameter must be the path to a socket or an IP address. If it is the latter, it must also be followed by a numeric port number.
The following example demonstrates the process of connecting to the game server and obtaining information using the UDP protocol.
socket_connect
//create UDP socket
if(($socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP)) print("Couldnt create socket: " .
socket_strerror(socket_last_error()). "
");
}
//timeout after 5 seconds
socket_set_option($socket, SOL_SOCKET,
SO_RCVTIMEO, array(sec=>5,usec=>0));
//connect to the RtCW master server
if(!socket_connect($socket, wolfmaster.idsoftware.com, 27950)){
print("Couldnt connect: " .
socket_strerror(socket_last_error()) . "
");
}
//send request for servers
socket_write($socket, "xFFxFFxFFxFFgetserversx00");
//get servers
$server = array();
while (FALSE !== ($line = @socket_read($socket, 4096))){
using ; $i += 7){
. . .
ord(substr($line, $i+3, 1)) ord(substr($line, $i+5, 1)) * 256) +
");
//loop over servers, getting status
foreach($server as $s){
&nb
http://www.bkjia.com/PHPjc/508280.html
www.bkjia.com

The main advantages of using database storage sessions include persistence, scalability, and security. 1. Persistence: Even if the server restarts, the session data can remain unchanged. 2. Scalability: Applicable to distributed systems, ensuring that session data is synchronized between multiple servers. 3. Security: The database provides encrypted storage to protect sensitive information.

Implementing custom session processing in PHP can be done by implementing the SessionHandlerInterface interface. The specific steps include: 1) Creating a class that implements SessionHandlerInterface, such as CustomSessionHandler; 2) Rewriting methods in the interface (such as open, close, read, write, destroy, gc) to define the life cycle and storage method of session data; 3) Register a custom session processor in a PHP script and start the session. This allows data to be stored in media such as MySQL and Redis to improve performance, security and scalability.

SessionID is a mechanism used in web applications to track user session status. 1. It is a randomly generated string used to maintain user's identity information during multiple interactions between the user and the server. 2. The server generates and sends it to the client through cookies or URL parameters to help identify and associate these requests in multiple requests of the user. 3. Generation usually uses random algorithms to ensure uniqueness and unpredictability. 4. In actual development, in-memory databases such as Redis can be used to store session data to improve performance and security.

Managing sessions in stateless environments such as APIs can be achieved by using JWT or cookies. 1. JWT is suitable for statelessness and scalability, but it is large in size when it comes to big data. 2.Cookies are more traditional and easy to implement, but they need to be configured with caution to ensure security.

To protect the application from session-related XSS attacks, the following measures are required: 1. Set the HttpOnly and Secure flags to protect the session cookies. 2. Export codes for all user inputs. 3. Implement content security policy (CSP) to limit script sources. Through these policies, session-related XSS attacks can be effectively protected and user data can be ensured.

Methods to optimize PHP session performance include: 1. Delay session start, 2. Use database to store sessions, 3. Compress session data, 4. Manage session life cycle, and 5. Implement session sharing. These strategies can significantly improve the efficiency of applications in high concurrency environments.

Thesession.gc_maxlifetimesettinginPHPdeterminesthelifespanofsessiondata,setinseconds.1)It'sconfiguredinphp.iniorviaini_set().2)Abalanceisneededtoavoidperformanceissuesandunexpectedlogouts.3)PHP'sgarbagecollectionisprobabilistic,influencedbygc_probabi

In PHP, you can use the session_name() function to configure the session name. The specific steps are as follows: 1. Use the session_name() function to set the session name, such as session_name("my_session"). 2. After setting the session name, call session_start() to start the session. Configuring session names can avoid session data conflicts between multiple applications and enhance security, but pay attention to the uniqueness, security, length and setting timing of session names.


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