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2010-05-26T10:37:26Z

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==Creating a Simple Socket-Based Server==



<source lang="html4strict">

<?php
set_time_limit(0);
$address = "127.0.0.1";
$port = 4545;
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
socket_bind($socket, $address, $port);
socket_listen($socket);
$connection = socket_accept($socket);
$result = trim(socket_read($connection, 1024));
echo "Result received: "$result"\n";
socket_close($connection);
socket_shutdown($socket);
socket_close($socket);
?>

</source>

==Domain Constants for Socket Connections==



<source lang="html4strict">

AF_INET Internet (IPv4) protocols

AF_INET6 Internet (IPv6) protocols

AF_UNIX Local interprocess communication

</source>

==Retrieving a Website Using Sockets==



<source lang="html4strict">

<?php
$address = "127.0.0.1";
$port = 80;
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
socket_connect($socket, $address, $port);
socket_write($socket, "GET /index.php HTTP/1.0\n\n");
$result = "";
while($read = socket_read($socket, 1024)) {
$result .= $read;
}
echo "Result received: "$result"\n";
socket_close($socket);
?>

</source>

==Socket Type Constants==



<source lang="html4strict">

SOCK_STREAM A sequenced and reliable bidirectional connection-based stream. Most common in use.

SOCK_DGRAM An unreliable, connectionless socket that transmits data of a fixed length. Very good for streaming of data where reliability is not a concern.

SOCK_SEQPACKET Similar to stream sockets, except data is transmitted and received in fixed-length packets.

SOCK_RAW A raw socket connection, useful for performing ICMP (Internet Control Message Protocol) operations such as traces, pings, and so on.

SOCK_RDM A reliable but unsequenced socket similar to that of SOCK_DGRAM.

</source>

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