Description
int
fsockopen ( string hostname, int port [, int errno [, string errstr [, float timeout]]])
Initiates a stream connection in the Internet (AF_INET, using TCP
or UDP) or Unix (AF_UNIX) domain. For the Internet domain, it
will open a TCP socket connection to
hostname on port
port. hostname may
in this case be either a fully qualified domain name or an IP
address. For UDP connections, you need to explicitly specify the
protocol by prefixing hostname with
'udp://'. For the Unix domain,
hostname will be used as the path to the
socket, port must be set to 0 in this
case. The optional timeout can be used to
set a timeout in seconds for the connect system call.
As of PHP 4.3.0, if you have compiled in OpenSSL support, you may
prefix the hostname with either
'ssl://' or 'tls://' to
use an SSL or TLS client connection over TCP/IP to connect
to the remote host.
fsockopen() returns a file pointer which may
be used together with the other file functions (such as
fgets(), fgetss(),
fputs(), fclose(), and
feof()).
If the call fails, it will return FALSE and if the optional
errno and errstr
arguments are present they will be set to indicate the actual
system level error that occurred in the system-level
connect() call. If the value returned in
errno is 0 and the
function returned FALSE, it is an indication that the error
occurred before the connect() call. This is
most likely due to a problem initializing the socket. Note that
the errno and
errstr arguments will always be passed by
reference.
Depending on the environment, the Unix domain or the optional
connect timeout may not be available.
The socket will by default be opened in blocking mode. You can
switch it to non-blocking mode by using
socket_set_blocking().
Example 1. fsockopen() Example <?php
$fp = fsockopen ("www.php.net", 80, $errno, $errstr, 30);
if (!$fp) {
echo "$errstr ($errno)<br>\n";
} else {
fputs ($fp, "GET / HTTP/1.0\r\nHost: www.php.net\r\n\r\n");
while (!feof($fp)) {
echo fgets ($fp,128);
}
fclose ($fp);
}
?> |
|
The example below shows how to retrieve the day and time
from the UDP service "daytime" (port 13) in your own machine.
Example 2. Using UDP connection <?php
$fp = fsockopen("udp://127.0.0.1", 13, $errno, $errstr);
if (!$fp) {
echo "ERROR: $errno - $errstr<br>\n";
} else {
fwrite($fp,"\n");
echo fread($fp, 26);
fclose($fp);
}
?> |
|
Note: The timeout parameter was introduced in PHP 3.0.9 and
UDP support was added in PHP 4.
See also
pfsockopen(),
socket_set_blocking(),
socket_set_timeout(),
fgets(),
fgetss(),
fputs(),
fclose(),
feof(), and
the
Curl extension.
