[ci skip] 3.1.8 release

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diff --git a/user_guide_src/source/libraries/email.rst b/user_guide_src/source/libraries/email.rst
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-###########
-Email Class
-###########
-
-CodeIgniter's robust Email Class supports the following features:
-
--  Multiple Protocols: Mail, Sendmail, and SMTP
--  TLS and SSL Encryption for SMTP
--  Multiple recipients
--  CC and BCCs
--  HTML or Plaintext email
--  Attachments
--  Word wrapping
--  Priorities
--  BCC Batch Mode, enabling large email lists to be broken into small
-   BCC batches.
--  Email Debugging tools
-
-.. contents::
-  :local:
-
-.. raw:: html
-
-  <div class="custom-index container"></div>
-
-***********************
-Using the Email Library
-***********************
-
-Sending Email
-=============
-
-Sending email is not only simple, but you can configure it on the fly or
-set your preferences in a config file.
-
-Here is a basic example demonstrating how you might send email. Note:
-This example assumes you are sending the email from one of your
-:doc:`controllers <../general/controllers>`.
-
-::
-
-	$this->load->library('email');
-
-	$this->email->from('your@example.com', 'Your Name');
-	$this->email->to('someone@example.com');
-	$this->email->cc('another@another-example.com');
-	$this->email->bcc('them@their-example.com');
-
-	$this->email->subject('Email Test');
-	$this->email->message('Testing the email class.');
-
-	$this->email->send();
-
-Setting Email Preferences
-=========================
-
-There are 21 different preferences available to tailor how your email
-messages are sent. You can either set them manually as described here,
-or automatically via preferences stored in your config file, described
-below:
-
-Preferences are set by passing an array of preference values to the
-email initialize method. Here is an example of how you might set some
-preferences::
-
-	$config['protocol'] = 'sendmail';
-	$config['mailpath'] = '/usr/sbin/sendmail';
-	$config['charset'] = 'iso-8859-1';
-	$config['wordwrap'] = TRUE;
-
-	$this->email->initialize($config);
-
-.. note:: Most of the preferences have default values that will be used
-	if you do not set them.
-
-Setting Email Preferences in a Config File
-------------------------------------------
-
-If you prefer not to set preferences using the above method, you can
-instead put them into a config file. Simply create a new file called the
-email.php, add the $config array in that file. Then save the file at
-config/email.php and it will be used automatically. You will NOT need to
-use the ``$this->email->initialize()`` method if you save your
-preferences in a config file.
-
-Email Preferences
-=================
-
-The following is a list of all the preferences that can be set when
-sending email.
-
-=================== ====================== ============================ =======================================================================
-Preference          Default Value          Options                      Description
-=================== ====================== ============================ =======================================================================
-**useragent**       CodeIgniter            None                         The "user agent".
-**protocol**        mail                   mail, sendmail, or smtp      The mail sending protocol.
-**mailpath**        /usr/sbin/sendmail     None                         The server path to Sendmail.
-**smtp_host**       No Default             None                         SMTP Server Address.
-**smtp_user**       No Default             None                         SMTP Username.
-**smtp_pass**       No Default             None                         SMTP Password.
-**smtp_port**       25                     None                         SMTP Port.
-**smtp_timeout**    5                      None                         SMTP Timeout (in seconds).
-**smtp_keepalive**  FALSE                  TRUE or FALSE (boolean)      Enable persistent SMTP connections.
-**smtp_crypto**     No Default             tls or ssl                   SMTP Encryption
-**wordwrap**        TRUE                   TRUE or FALSE (boolean)      Enable word-wrap.
-**wrapchars**       76                                                  Character count to wrap at.
-**mailtype**        text                   text or html                 Type of mail. If you send HTML email you must send it as a complete web
-                                                                        page. Make sure you don't have any relative links or relative image
-                                                                        paths otherwise they will not work.
-**charset**         ``$config['charset']``                              Character set (utf-8, iso-8859-1, etc.).
-**validate**        FALSE                  TRUE or FALSE (boolean)      Whether to validate the email address.
-**priority**        3                      1, 2, 3, 4, 5                Email Priority. 1 = highest. 5 = lowest. 3 = normal.
-**crlf**            \\n                    "\\r\\n" or "\\n" or "\\r"   Newline character. (Use "\\r\\n" to comply with RFC 822).
-**newline**         \\n                    "\\r\\n" or "\\n" or "\\r"   Newline character. (Use "\\r\\n" to comply with RFC 822).
-**bcc_batch_mode**  FALSE                  TRUE or FALSE (boolean)      Enable BCC Batch Mode.
-**bcc_batch_size**  200                    None                         Number of emails in each BCC batch.
-**dsn**             FALSE                  TRUE or FALSE (boolean)      Enable notify message from server
-=================== ====================== ============================ =======================================================================
-
-Overriding Word Wrapping
-========================
-
-If you have word wrapping enabled (recommended to comply with RFC 822)
-and you have a very long link in your email it can get wrapped too,
-causing it to become un-clickable by the person receiving it.
-CodeIgniter lets you manually override word wrapping within part of your
-message like this::
-
-	The text of your email that
-	gets wrapped normally.
-
-	{unwrap}http://example.com/a_long_link_that_should_not_be_wrapped.html{/unwrap}
-
-	More text that will be
-	wrapped normally.
-
-
-Place the item you do not want word-wrapped between: {unwrap} {/unwrap}
-
-***************
-Class Reference
-***************
-
-.. php:class:: CI_Email
-
-	.. php:method:: from($from[, $name = ''[, $return_path = NULL]])
-
-		:param	string	$from: "From" e-mail address
-		:param	string	$name: "From" display name
-		:param	string	$return_path: Optional email address to redirect undelivered e-mail to
-		:returns:	CI_Email instance (method chaining)
-		:rtype:	CI_Email
-
-		Sets the email address and name of the person sending the email::
-
-			$this->email->from('you@example.com', 'Your Name');
-
-		You can also set a Return-Path, to help redirect undelivered mail::
-
-			$this->email->from('you@example.com', 'Your Name', 'returned_emails@example.com');
-
-		.. note:: Return-Path can't be used if you've configured 'smtp' as
-			your protocol.
-
-	.. php:method:: reply_to($replyto[, $name = ''])
-
-		:param	string	$replyto: E-mail address for replies
-		:param	string	$name: Display name for the reply-to e-mail address
-		:returns:	CI_Email instance (method chaining)
-		:rtype:	CI_Email
-
-		Sets the reply-to address. If the information is not provided the
-		information in the :meth:from method is used. Example::
-
-			$this->email->reply_to('you@example.com', 'Your Name');
-
-	.. php:method:: to($to)
-
-		:param	mixed	$to: Comma-delimited string or an array of e-mail addresses
-		:returns:	CI_Email instance (method chaining)
-		:rtype:	CI_Email
-
-		Sets the email address(s) of the recipient(s). Can be a single e-mail,
-		a comma-delimited list or an array::
-
-			$this->email->to('someone@example.com');
-
-		::
-
-			$this->email->to('one@example.com, two@example.com, three@example.com');
-
-		::
-
-			$this->email->to(
-				array('one@example.com', 'two@example.com', 'three@example.com')
-			);
-
-	.. php:method:: cc($cc)
-
-		:param	mixed	$cc: Comma-delimited string or an array of e-mail addresses
-		:returns:	CI_Email instance (method chaining)
-		:rtype:	CI_Email
-
-		Sets the CC email address(s). Just like the "to", can be a single e-mail,
-		a comma-delimited list or an array.
-
-	.. php:method:: bcc($bcc[, $limit = ''])
-
-		:param	mixed	$bcc: Comma-delimited string or an array of e-mail addresses
-		:param	int	$limit: Maximum number of e-mails to send per batch
-		:returns:	CI_Email instance (method chaining)
-		:rtype:	CI_Email
-
-		Sets the BCC email address(s). Just like the ``to()`` method, can be a single
-		e-mail, a comma-delimited list or an array.
-
-		If ``$limit`` is set, "batch mode" will be enabled, which will send
-		the emails to batches, with each batch not exceeding the specified
-		``$limit``.
-
-	.. php:method:: subject($subject)
-
-		:param	string	$subject: E-mail subject line
-		:returns:	CI_Email instance (method chaining)
-		:rtype:	CI_Email
-
-		Sets the email subject::
-
-			$this->email->subject('This is my subject');
-
-	.. php:method:: message($body)
-
-		:param	string	$body: E-mail message body
-		:returns:	CI_Email instance (method chaining)
-		:rtype:	CI_Email
-
-		Sets the e-mail message body::
-
-			$this->email->message('This is my message');
-
-	.. php:method:: set_alt_message($str)
-
-		:param	string	$str: Alternative e-mail message body
-		:returns:	CI_Email instance (method chaining)
-		:rtype:	CI_Email
-
-		Sets the alternative e-mail message body::
-
-			$this->email->set_alt_message('This is the alternative message');
-
-		This is an optional message string which can be used if you send
-		HTML formatted email. It lets you specify an alternative message
-		with no HTML formatting which is added to the header string for
-		people who do not accept HTML email. If you do not set your own
-		message CodeIgniter will extract the message from your HTML email
-		and strip the tags.
-
-	.. php:method:: set_header($header, $value)
-
-		:param	string	$header: Header name
-		:param	string	$value: Header value
-		:returns:	CI_Email instance (method chaining)
-		:rtype: CI_Email
-
-		Appends additional headers to the e-mail::
-
-			$this->email->set_header('Header1', 'Value1');
-			$this->email->set_header('Header2', 'Value2');
-
-	.. php:method:: clear([$clear_attachments = FALSE])
-
-		:param	bool	$clear_attachments: Whether or not to clear attachments
-		:returns:	CI_Email instance (method chaining)
-		:rtype: CI_Email
-
-		Initializes all the email variables to an empty state. This method
-		is intended for use if you run the email sending method in a loop,
-		permitting the data to be reset between cycles.
-
-		::
-
-			foreach ($list as $name => $address)
-			{
-				$this->email->clear();
-
-				$this->email->to($address);
-				$this->email->from('your@example.com');
-				$this->email->subject('Here is your info '.$name);
-				$this->email->message('Hi '.$name.' Here is the info you requested.');
-				$this->email->send();
-			}
-
-		If you set the parameter to TRUE any attachments will be cleared as
-		well::
-
-			$this->email->clear(TRUE);
-
-	.. php:method:: send([$auto_clear = TRUE])
-
-		:param	bool	$auto_clear: Whether to clear message data automatically
-		:returns:	TRUE on success, FALSE on failure
-		:rtype:	bool
-
-		The e-mail sending method. Returns boolean TRUE or FALSE based on
-		success or failure, enabling it to be used conditionally::
-
-			if ( ! $this->email->send())
-			{
-				// Generate error
-			}
-
-		This method will automatically clear all parameters if the request was
-		successful. To stop this behaviour pass FALSE::
-
-		 	if ($this->email->send(FALSE))
-		 	{
-		 		// Parameters won't be cleared
-		 	}
-
-		.. note:: In order to use the ``print_debugger()`` method, you need
-			to avoid clearing the email parameters.
-
-	.. php:method:: attach($filename[, $disposition = ''[, $newname = NULL[, $mime = '']]])
-
-		:param	string	$filename: File name
-		:param	string	$disposition: 'disposition' of the attachment. Most
-			email clients make their own decision regardless of the MIME
-			specification used here. https://www.iana.org/assignments/cont-disp/cont-disp.xhtml
-		:param	string	$newname: Custom file name to use in the e-mail
-		:param	string	$mime: MIME type to use (useful for buffered data)
-		:returns:	CI_Email instance (method chaining)
-		:rtype:	CI_Email
-
-		Enables you to send an attachment. Put the file path/name in the first
-		parameter. For multiple attachments use the method multiple times.
-		For example::
-
-			$this->email->attach('/path/to/photo1.jpg');
-			$this->email->attach('/path/to/photo2.jpg');
-			$this->email->attach('/path/to/photo3.jpg');
-
-		To use the default disposition (attachment), leave the second parameter blank,
-		otherwise use a custom disposition::
-
-			$this->email->attach('image.jpg', 'inline');
-
-		You can also use a URL::
-
-			$this->email->attach('http://example.com/filename.pdf');
-
-		If you'd like to use a custom file name, you can use the third parameter::
-
-			$this->email->attach('filename.pdf', 'attachment', 'report.pdf');
-
-		If you need to use a buffer string instead of a real - physical - file you can
-		use the first parameter as buffer, the third parameter as file name and the fourth
-		parameter as mime-type::
-
-			$this->email->attach($buffer, 'attachment', 'report.pdf', 'application/pdf');
-
-	.. php:method:: attachment_cid($filename)
-
-		:param	string	$filename: Existing attachment filename
-		:returns:	Attachment Content-ID or FALSE if not found
-		:rtype:	string
- 
-		Sets and returns an attachment's Content-ID, which enables your to embed an inline
-		(picture) attachment into HTML. First parameter must be the already attached file name.
-		::
- 
-			$filename = '/img/photo1.jpg';
-			$this->email->attach($filename);
-			foreach ($list as $address)
-			{
-				$this->email->to($address);
-				$cid = $this->email->attachment_cid($filename);
-				$this->email->message('<img src="cid:'. $cid .'" alt="photo1" />');
-				$this->email->send();
-			}
-
-		.. note:: Content-ID for each e-mail must be re-created for it to be unique.
-
-	.. php:method:: print_debugger([$include = array('headers', 'subject', 'body')])
-
-		:param	array	$include: Which parts of the message to print out
-		:returns:	Formatted debug data
-		:rtype:	string
-
-		Returns a string containing any server messages, the email headers, and
-		the email message. Useful for debugging.
-
-		You can optionally specify which parts of the message should be printed.
-		Valid options are: **headers**, **subject**, **body**.
-
-		Example::
-
-			// You need to pass FALSE while sending in order for the email data
-			// to not be cleared - if that happens, print_debugger() would have
-			// nothing to output.
-			$this->email->send(FALSE);
-
-			// Will only print the email headers, excluding the message subject and body
-			$this->email->print_debugger(array('headers'));
-
-		.. note:: By default, all of the raw data will be printed.
\ No newline at end of file