achieve
Related functions:, the socket_create、socket_set_block、socket_bind、socket_listen、socket_accept、socket_read、socket_writespecific parameter descriptions of these functions are written in the PHP document in detail, so I won't repeat them here, here is just an introduction to how the server handles the request.
//Ensure that there will be no timeout when connecting to the client set_time_limit(0);//Set IP and port number $address = "127.0.0.1"; $port = 54321; $socketServer = socket_create(AF_INET, SOCK_STREAM, SOL_TCP) or die ("socket_create() fail:". socket_strerror(socket_last_error()). "/n");//Set to blocking mode socket_set_block($socketServer) or die("socket_set_block() fail:". socket_strerror(socket_last_error()) . "/n");//Bind port $result = socket_bind($socketServer, $address, $port) or die("socket_bind() fail:". socket_strerror(socket_last_error()). "/n"); //Start listening $result = socket_listen($socketServer, 4) or die("socket_listen() fail:". Socket_strerror(socket_last_error()). "/N");
do {
//Receive connection request and return a sub Socket To process the information between the client and the server
$sock = socket_accept($socketServer) or die("socket_accept() failed: reason: " . socket_strerror(socket_last_error()) . "/n");
while($sock){
//Read client data
echo "Read client data \n";
$length = socket_read($sock, 4);
$length = unpack('i', $length);
echo "length:$length[1] \n";
$request = socket_read($sock, $length[1]);
echo "$request:$request \n";
//数据传送 向客户端写入返回结果
$msg = "this is response message \n";
$msgLength = strlen($msg);
$msgLength = pack('i', $msgLength);
socket_write($sock, $msgLength);
socket_write($sock, $msg, strlen($msg)) or die("socket_write() failed: reason: " . socket_strerror(socket_last_error()) ."/n");
break;
}
} while (true);socket_close($socketServer);123456789101112131415161718192021222324252627282930313233343536373839
After receiving the client's request, it can be processed in combination with PHP's multi-threading, here is just a simple return string.
to sum up
The socketcommunication methods of all major languages are similar, and the processes on the server side are similar. In socketthe case of a ready-made high-performance communication framework, it is recommended not to implement it yourself, but you must understand how the underlying framework is implemented.
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