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                                   fsockopen

   (PHP 3, PHP 4 )
   fsockopen --  Open Internet or Unix domain socket connection

Description

   int 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
   Appendix J. A list of supported transports can also be retrieved using
   stream_get_transports().

     Note: 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().

   Example 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.

   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);
   }
   ?>

   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.

     Note: 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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