PHP SOCKET Technology Research _php Tutorial

Today try to write a PHP and C language through the socket communication program, read the PHP manual, found that there are several ways to establish a socket client.

1, through Fsockopen () to establish a socket connection, and then use Fputs () to send messages, with Fgets () to receive messages.

2. Establish a socket connection via Socket_create (), then send a message with socket_send () or Socket_write () and send a message with SOCKET_RECV () or Socket_read ().

Strangely enough, I saw this passage in the handbook. "This extension is experimental. The behavior of the module, including the name of its function and any other documentation about the module, may change with subsequent releases of PHP without notice. We remind you that you are at your own risk while using this extension module. "It seems that the php4.0 socket communication is not completely stable.

Today I wrote the client to do two communication with the server, I use the above method has written a client program, found that when only one communication, that is, the PHP client sends a message, and then receive the return message, then close the connection. Both of these methods can be implemented correctly and quickly, but as two communication, but there are obvious differences, the first method of communication is particularly fast end, this I can see through the output of the server, but the second communication to wait for several minutes to end, I tried several times this, I'm not sure where my program went wrong, or the way the connection is problematic, but the second way to do this two communication is fast, correct! accomplished very much.

Finally, I wrote a class based on the second case.

File Description//////////////////////////////////////////
Class Name:socket
version:v1.0
Functional outline:create Socket,and Send message to server
Revision HISTORY:2004/12/15 First version created
CURRENT:2004/12/15 Liu Yongsheng
//////////////////////////////////////////////////////////////////////////////////////////
Class socket{
var $socket; Socket handle
var $sendflag = ">>>";
var $recvflag = "<<<";
var $response;
var $debug = 1;
function socket ($hostname, $port) {
$address = gethostbyname ($hostname);
$this->socket = socket_create (AF_INET,SOCK_STREAM,SOL_TCP);
$result = Socket_connect ($this->socket, $address, $port);
if ($this->debug = = 1) {
if ($result < 0) {
echo "Socket_connect () Failed.\nreason: ($result)". Socket_strerror ($result). "
";
} else{
echo "Connect OK.
";
}
}
}
function sendmsg ($msg) {
Socket_write ($this->socket, $msg, strlen ($msg));
$result = Socket_read ($this->socket,100);
$this->response = $result;
if ($this->debug = = 1) {
printf ("%s $msg
", $this->sendflag);
printf ("%s $result
", $this->recvflag);
}
return $result;
}
function Close () {
Socket_close ($this->socket);
}

}

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