Code server php socket

// don't timeout
set_time_limit (0);

// set some variables
$host = "117.103.233.72";
$port = 1234;

// create socket
$socket = socket_create(AF_INET, SOCK_STREAM, 0) or die("Could not create
socket\n");

// bind socket to port
$result = socket_bind($socket, $host, $port) or die("Could not bind to
socket\n");

// start listening for connections
$result = socket_listen($socket, 3) or die("Could not set up socket
listener\n");

echo "Waiting for connections...\n";

// accept incoming connections
// spawn another socket to handle communication
$spawn = socket_accept($socket) or die("Could not accept incoming
connection\n");

echo "Received connection request\n";

// write a welcome message to the client
$welcome = "Roll up, roll up, to the greatest show on earth!\n? ";
socket_write($spawn, $welcome, strlen ($welcome)) or die("Could not send
connect string\n");

// keep looping and looking for client input
do
{
// read client input
$input = socket_read($spawn, 1024, 1) or die("Could not read input\n");

if (trim($input) != "")
{
echo "Received input: $input\n";

// if client requests session end
if (trim($input) == "END")
{
// close the child socket
// break out of loop
socket_close($spawn);
break;
}
// otherwise...
else
{
// reverse client input and send back
$output = strrev($input) . "\n";
socket_write($spawn, $output . "? ", strlen (($output)+2)) or die("Could
not write output\n");
echo "Sent output: " . trim($output) . "\n";
}
}

} while (true);

// close primary socket
socket_close($socket);
echo "Socket terminated\n";
?>