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fsockopen
Synopsis
mixed fsockopen(host, port[,
error_number][, error_string][, timeout]);
string host: Hostname or IP
address
int port: Port number
reference error_number
(optional): Reference to a variable that will store the
system-level error number if the function fails
reference error_string
(optional): Reference to a variable that will store the
system-level error message if the function fails
double timeout (optional):
Number of seconds before the connect system call times
out
Description
fsockopen() attempts to open a network socket connection to the specified host and port. TCP connections are assumed by default, but UDP connections can be specified by placing udp:// at the start of the host .
There are three optional arguments: error_number , error_string , and timeout . Both the error_number and error_string arguments must be passed as references, as in &$error_number and &$error_string. If an error occurs, these variables will contain an error code and a message. If the error number is 0, this is usually due to a problem that occurs before the socket initializes, such as an incorrect hostname.
The timeout argument should contain the maximum number of seconds to wait for a connection before timing out.
Example
Example 833. Attempt to open a socket
<?php
$host = 'www.newriders.com';
$port = 80;
$fp = fsockopen($host, $port, &$err_no, &$err_msg, 10)
or die ("Could not open a socket connection to host <i>$host</i> on port <i>$port</i>.
The error message returned was '<i>$err_msg</i>'.");
echo "A socket connection to host <i>$host</i> on port <i>$port</i> was successfully opened."
?>