How does PHP collect socket data? 20

Send data.

The function send will only send data, it needs the socket descriptor, the data being sent and its size.

message = "get / http/";if(!socket_send($socket,$message,strlen($message),0)){

errorcode = socket_last_error();

errormsg = socket_strerror($errorcode);

die("send failed !");

The message is actually an http command to get the home page.

Note] When sending data to a socket, you are basically writing data to the socket similar to writing data to a file, so you can also use the write function to send data to the socket.

Receive data. Use the recv function to receive data on the socket.

if(socket_recv($socket,$buf,2045,msg_waitall) === false){

errorcode = socket_last_error();

errormsg = socket_strerror($errorcode);

die("receive failed !");

echo $buf;

Turn off the socket

socket_close($socket);

PHP does not support WebSockets

But you can find an extension that doesn't have a websocket.

In addition, you can consider using JS to connect to the other party's websocket, and pass the data to PHP through AJAX after obtaining the data. This will have a problem, how does PHP tune JS? If you use the web mode, it's relatively simple, but if you use the CLI mode, you can't think of any way to use it.

In the process of using PHP for data collection, it is common to encounter the situation that the IP address is blocked or a verification code appears; In order to be able to continue the collection, we need to switch between different IPs, and each time we visit, we will switch one IP at random. Of course, you can also collect a large number of ** and collect ** by switching **, and the principle is about the same.

Because I encountered this situation in my actual work, the scene that happened happened was the server of the US station group, which has been bound to more than 200 IPs (this kind of server is 1300 yuan a month), so you can easily use the socket bind() function to bind the export IP, and you only need to randomly select an IP for binding.