A brief analysis of PHP Socket technology_PHP tutorial

phpsocketSocket is located in the transmission control protocol of the TCP/IP protocol and provides asynchronous communication in the client-server mode, that is, the client sends a service request to the server, and after the server receives the request, it provides corresponding feedback or service! I practiced a most basic example:

Use and initiate a blocking (block) connection, that is, if the server does not return a data stream, it will remain connected. Once a data stream comes in, it will disconnect immediately after obtaining the content. The code is as follows:

Copy code The code is as follows:

$host = www.sohu.com ; //This address is arbitrary, you can use Sina's, it's mainly for testing, it doesn't matter which one
$page = "/index.html";
$port = 80;
$request = "GET $ page HTTP/1.1rn";
$request .= "Host: $hostrn";
//$request .= "Referer:$hostrn";
$request .= "Connection: closernrn";
//Allow the connection timeout to be 1.5 seconds
$connectionTimeout = 1.5;
//Allow the remote server to complete the response within 2 seconds
$responseTimeout = 2;
//Create a socket connection
$fp = fsockopen($host, $port, $errno, $errstr, $connectionTimeout);
if (!$fp) {
throw new Exception("Connection to $hostfailed:$ errstr");
} else {
stream_set_blocking($fp, true);
stream_set_timeout($fp, $responseTimeout);
}
//Send request string
fwrite ($fp, $request);
//Get the returned data stream content
$content = stream_get_contents($fp);
echo $content;
$meta = stream_get_meta_data($fp);
if ($meta['timed_out']) {
throw new Exception("Responsefrom web services server timed out.");
}
//Close the Socket connection
fclose($ fp);
?>

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