PHP Sockets

[hammo]

Hello Everyone,

I am having some problems writing a php script that uses socket functions. Basically I:

- Have created a telnet client in PERL that receives the temperature of a sensor attached to the back of a server using a serial port.
- Created a server that receives the data from the telnet client (Also in PERL). Now this server has two functions:
- INSERT: If a connection from a client prints the string "insert", then the server inserts the value of the insert data into a string.
- VIEW: If a connection is received from a client and the client prints the string 'view', then the server prints the content of the string to client.

Now, I have found several php socket connection type scripts. Here is one that I wrote myself based on what I found;

<?php

$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
$connection = socket_connect($socket, 'server', 15905);
socket_write($socket, "view\r");
while ($data = socket_read($socket,2046, PHP_NORMAL_READ);

{

echo $data;

}
socket_close($socket);

?>

Now for some reason, when I use this script I get an error that returns something along the lines of 'No data to read on socket[0]'. Now I have tested it using telnet. It all works on both Linux and Windows. I'm pretty sure that's all the info that I really have.

Thanks and Regards,

Adam

[leibowitz]

I never used sockets before with PHP, but apparently you need to Create, Bind, Listen, Acppet, and then Read. I'm not sure about the last one.

Inspired from http://be2.php.net/manual/en/function.socket-accept.php

<?
$address = "server";
$port = "4545"
$socket = socket_create(AF_INET,SOCK_STREAM,SOL_TCP);
socket_bind($socket,$address,$port);
socket_listen($socket);

$accepted = socket_accept($socket);

if($accepted)
{
$data = socket_read($socket,2046, PHP_NORMAL_READ);
echo $data;
socket_close($socket);

}

?>

Please adapt the Read part, as I'm not sure how to stop the loop properly without error.

[aks44]

If you're writing a PHP client (that's what I understood from your post, but leibowitz made me doubt ;)), using fsockopen and the standard file functions feof / fread / fwrite / fclose will be more than enough.

Something like :


$sock = fsockopen('server',$port);
if ($sock)
{
fwrite($sock,'view\n');
$data = '';
while (!feof($sock))
$data .= fread($sock,4096);
fclose($sock);
echo $data;
}
else
die('painfully');