stream_socket_enable_crypto(3) [php man page]

STREAM_SOCKET_ENABLE_CRYPTO(3)						 1					    STREAM_SOCKET_ENABLE_CRYPTO(3)

stream_socket_enable_crypto - Turns encryption on/off on an already connected socket

SYNOPSIS

       mixed stream_socket_enable_crypto (resource  $stream, bool  $enable, [int  $crypto_type], [resource  $session_stream])

DESCRIPTION

	Enable or disable encryption on the stream.

	Once the crypto settings are established, cryptography can be turned on and off dynamically by passing TRUE or FALSE in the $enable param-
       eter.

PARAMETERS

	      o $stream
		- The stream resource.

	      o $enable
		- Enable/disable cryptography on the stream.

	      o $crypto_type
		- Setup encryption on the stream. Valid methods are

		     o STREAM_CRYPTO_METHOD_SSLv2_CLIENT

		     o STREAM_CRYPTO_METHOD_SSLv3_CLIENT

		     o STREAM_CRYPTO_METHOD_SSLv23_CLIENT

		     o STREAM_CRYPTO_METHOD_TLS_CLIENT

		     o STREAM_CRYPTO_METHOD_SSLv2_SERVER

		     o STREAM_CRYPTO_METHOD_SSLv3_SERVER

		     o STREAM_CRYPTO_METHOD_SSLv23_SERVER

		     o STREAM_CRYPTO_METHOD_TLS_SERVER

	       If omitted, the $crypto_type context option on the stream's SSL context will be used instead.

	      o $session_stream
		- Seed the stream with settings from $session_stream.

RETURN VALUES

	Returns TRUE on success, FALSE if negotiation has failed or 0 if there isn't enough data and you should try again (only  for  non-blocking
       sockets).

CHANGELOG

       +--------+------------------------------------+
       |Version |				     |
       |	|				     |
       |	|	     Description	     |
       |	|				     |
       +--------+------------------------------------+
       | 5.6.0	|				     |
       |	|				     |
       |	|  The $crypto_type is now optional. |
       |	|				     |
       +--------+------------------------------------+
EXAMPLES

       Example #1

	      stream_socket_enable_crypto(3) example

	      <?php
	      $fp = stream_socket_client("tcp://myproto.example.com:31337", $errno, $errstr, 30);
	      if (!$fp) {
		  die("Unable to connect: $errstr ($errno)");
	      }

	      /* Turn on encryption for login phase */
	      stream_socket_enable_crypto($fp, true, STREAM_CRYPTO_METHOD_SSLv23_CLIENT);
	      fwrite($fp, "USER god
");
	      fwrite($fp, "PASS secret
");

	      /* Turn off encryption for the rest */
	      stream_socket_enable_crypto($fp, false);

	      while ($motd = fgets($fp)) {
		  echo $motd;
	      }

	      fclose($fp);
	      ?>

	      The above example will output something similar to:

SEE ALSO

       "OpenSSL Functions", "List of Supported Socket Transports".

PHP Documentation Group 											    STREAM_SOCKET_ENABLE_CRYPTO(3)

FWRITE(3)								 1								 FWRITE(3)

fwrite - Binary-safe file write

SYNOPSIS

       int fwrite (resource  $handle, string  $string, [int  $length])

DESCRIPTION

       fwrite(3) writes the contents of $string to the file stream pointed to by $handle.

PARAMETERS

	      o $handle
		-A file system pointer resource that is typically created using fopen(3).

	      o $string
		- The string that is to be written.

	      o $length
		-  If  the  $length  argument  is given, writing will stop after $length bytes have been written or the end of $string is reached,
		whichever comes first.	Note that if the $length argument is given, then the magic_quotes_runtime  configuration  option  will	be
		ignored and no slashes will be stripped from $string.

RETURN VALUES

       fwrite(3) returns the number of bytes written, or FALSE on error.

NOTES

       Note

	       Writing to a network stream may end before the whole string is written. Return value of fwrite(3) may be checked:

	      <?php
	      function fwrite_stream($fp, $string) {
		  for ($written = 0; $written < strlen($string); $written += $fwrite) {
		      $fwrite = fwrite($fp, substr($string, $written));
		      if ($fwrite === false) {
			  return $written;
		      }
		  }
		  return $written;
	      }
	      ?>

       Note

	       On  systems  which differentiate between binary and text files (i.e. Windows) the file must be opened with 'b' included in fopen(3)
	      mode parameter.

       Note

	       If $handle was fopen(3)ed in append mode, fwrite(3)s are atomic (unless the size of $string exceeds the filesystem's block size, on
	      some  platforms,	and as long as the file is on a local filesystem). That is, there is no need to flock(3) a resource before calling
	      fwrite(3); all of the data will be written without interruption.

       Note

	       If writing twice to the file pointer, then the data will be appended to the end of the file content:

	      <?php
	      $fp = fopen('data.txt', 'w');
	      fwrite($fp, '1');
	      fwrite($fp, '23');
	      fclose($fp);

	      // the content of 'data.txt' is now 123 and not 23!
	      ?>

EXAMPLES

       Example #1

	      A simple fwrite(3) example

	      <?php
	      $filename = 'test.txt';
	      $somecontent = "Add this to the file
";

	      // Let's make sure the file exists and is writable first.
	      if (is_writable($filename)) {

		  // In our example we're opening $filename in append mode.
		  // The file pointer is at the bottom of the file hence
		  // that's where $somecontent will go when we fwrite() it.
		  if (!$handle = fopen($filename, 'a')) {
		       echo "Cannot open file ($filename)";
		       exit;
		  }

		  // Write $somecontent to our opened file.
		  if (fwrite($handle, $somecontent) === FALSE) {
		      echo "Cannot write to file ($filename)";
		      exit;
		  }

		  echo "Success, wrote ($somecontent) to file ($filename)";

		  fclose($handle);

	      } else {
		  echo "The file $filename is not writable";
	      }
	      ?>

SEE ALSO

       fread(3), fopen(3), fsockopen(3), popen(3), file_get_contents(3).

PHP Documentation Group 														 FWRITE(3)