Podręcznik PHP
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# fsockopen

(PHP 3, PHP 4 )

fsockopen -- Open Internet or Unix domain socket connection

## Description

resource fsockopen ( string target, int port [, int errno [, string errstr [, float timeout]]])

Initiates a socket connection to the resource specified by `target`. `PHP` supports targets in the Internet and Unix domains as described in Dodatek K. A list of supported transports can also be retrieved using stream_get_transports().

> Notatka: If you need to set a timeout for reading/writing data over the socket, use stream_set_timeout(), as the `timeout` parameter to fsockopen() only applies while connecting the socket.

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 stream_set_blocking().

Przykład 1. fsockopen() Example
`<?php $fp = fsockopen("www.example.com", 80, $errno, $errstr, 30); if (!$fp) { echo "$errstr ($errno)<br />\n"; } else { $out = "GET / HTTP/1.1\r\n"; $out .= "Host: www.example.com\r\n"; $out .= "Connection: Close\r\n\r\n"; fputs($fp, $out); while (!feof($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.

Przykład 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); } ?>`

Ostrzeżenie
UDP sockets will sometimes appear to have opened without an error, even if the remote host is unreachable. The error will only become apparent when you read or write data to/from the socket. The reason for this is because UDP is a "connectionless" protocol, which means that the operating system does not try to establish a link for the socket until it actually needs to send or receive data.

> Notatka: Podając numeryczny adres IPv6 (np. fe80::1), adres musi być objęty nawiasami kwadratowymi. Na przykład `tcp://[fe80::1]:80`.

> Notatka: The timeout parameter was introduced in PHP 3.0.9 and UDP support was added in PHP 4.

See also pfsockopen(), stream_set_blocking(), stream_set_timeout(), fgets(), fgetss(), fputs(), fclose(), feof(), and the Curl extension.

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