FSOCKOPEN(3)								 1							      FSOCKOPEN(3)

fsockopen - Open Internet or Unix domain socket connection

SYNOPSIS

       resource   fsockopen   (string	 $hostname,   [int    $port   =   -1],	 [int	 &$errno],   [string	&$errstr],   [float    $timeout  =
       ini_get("default_socket_timeout")])

DESCRIPTION

	Initiates a socket connection to the resource specified by $hostname.

	PHP supports targets in the Internet and Unix domains as described in "List of Supported Socket Transports". A list  of  supported  trans-
       ports can also be retrieved using stream_get_transports(3).

	The socket will by default be opened in blocking mode. You can switch it to non-blocking mode by using stream_set_blocking(3).

	The function stream_socket_client(3) is similar but provides a richer set of options, including non-blocking connection and the ability to
       provide a stream context.

PARAMETERS

	      o $hostname
		- If OpenSSL support is installed, you may prefix the $hostname with either ssl:// or tls:// to use an SSL or TLS  client  connec-
		tion over TCP/IP to connect to the remote host.

	      o $port
		- The port number. This can be omitted and skipped with -1 for transports that do not use ports, such as unix://.

	      o $errno
		-  If  provided,  holds  the system level error number 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.

	      o $errstr
		- The error message as a string.

	      o $timeout
		- The connection timeout, in seconds.

	      Note

		      If  you need to set a timeout for reading/writing data over the socket, use stream_set_timeout(3), as the $timeout parameter
		     to fsockopen(3) only applies while connecting the socket.

RETURN VALUES

       fsockopen(3) returns a file pointer which may be used together with the other file  functions  (such  as  fgets(3),  fgetss(3),	fwrite(3),
       fclose(3), and feof(3)). If the call fails, it will return FALSE

ERRORS
/EXCEPTIONS
	Throws E_WARNING if $hostname is not a valid domain.

EXAMPLES

       Example #1

	      fsockopen(3) Example

	      <?php
	      $fp = fsockopen("www.example.com", 80, $errno, $errstr, 30);
	      if (!$fp) {
		  echo "$errstr ($errno)<br />
";
	      } else {
		  $out = "GET / HTTP/1.1
";
		  $out .= "Host: www.example.com
";
		  $out .= "Connection: Close

";
		  fwrite($fp, $out);
		  while (!feof($fp)) {
		      echo fgets($fp, 128);
		  }
		  fclose($fp);
	      }
	      ?>

       Example #2

	      Using UDP connection

	       The example below shows how to retrieve the day and time from the UDP service "daytime" (port 13) in your own machine.

	      <?php
	      $fp = fsockopen("udp://127.0.0.1", 13, $errno, $errstr);
	      if (!$fp) {
		  echo "ERROR: $errno - $errstr<br />
";
	      } else {
		  fwrite($fp, "
");
		  echo fread($fp, 26);
		  fclose($fp);
	      }
	      ?>

NOTES

       Note

	       Depending on the environment, the Unix domain or the optional connect timeout may not be available.

       Warning

	       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.

       Note

	      When  specifying	a  numerical  IPv6  address  (e.g.   fe80::1),	you  must  enclose  the  IP  in  square   brackets--for   example,
	      tcp://[fe80::1]:80.

SEE ALSO

       pfsockopen(3),  stream_socket_client(3), stream_set_blocking(3), stream_set_timeout(3), fgets(3), fgetss(3), fwrite(3), fclose(3), feof(3),
       socket_connect(3), The Curl extension.

PHP Documentation Group 													      FSOCKOPEN(3)