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| author | Timothy Warren <tim@timshomepage.net> | 2011-10-06 03:47:59 +0200 |
|---|---|---|
| committer | Timothy Warren <tim@timshomepage.net> | 2011-10-06 03:47:59 +0200 |
| commit | fb7ff742949e0474dfba30be45be513b3b4f63cc (patch) | |
| tree | 87b150fd502d0789f9660ca4dc2ace44817813c3 /user_guide/libraries/trackback.html | |
| parent | f7a8d86dbc6805a4e52964bbea76738df75b5f35 (diff) | |
| parent | ec8abee24f456b09ab9d53e88853fe6bd0f7879a (diff) | |
Merge branch 'develop' of git://github.com/EllisLab/CodeIgniter into develop
Diffstat (limited to 'user_guide/libraries/trackback.html')
| -rw-r--r-- | user_guide/libraries/trackback.html | 246 |
1 files changed, 0 insertions, 246 deletions
diff --git a/user_guide/libraries/trackback.html b/user_guide/libraries/trackback.html deleted file mode 100644 index a2912a594..000000000 --- a/user_guide/libraries/trackback.html +++ /dev/null @@ -1,246 +0,0 @@ -<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> -<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> -<head> - -<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> -<title>Trackback Class : CodeIgniter User Guide</title> - -<style type='text/css' media='all'>@import url('../userguide.css');</style> -<link rel='stylesheet' type='text/css' media='all' href='../userguide.css' /> - -<script type="text/javascript" src="../nav/nav.js"></script> -<script type="text/javascript" src="../nav/prototype.lite.js"></script> -<script type="text/javascript" src="../nav/moo.fx.js"></script> -<script type="text/javascript" src="../nav/user_guide_menu.js"></script> - -<meta http-equiv='expires' content='-1' /> -<meta http-equiv= 'pragma' content='no-cache' /> -<meta name='robots' content='all' /> -<meta name='author' content='ExpressionEngine Dev Team' /> -<meta name='description' content='CodeIgniter User Guide' /> - -</head> -<body> - -<!-- START NAVIGATION --> -<div id="nav"><div id="nav_inner"><script type="text/javascript">create_menu('../');</script></div></div> -<div id="nav2"><a name="top"></a><a href="javascript:void(0);" onclick="myHeight.toggle();"><img src="../images/nav_toggle_darker.jpg" width="154" height="43" border="0" title="Toggle Table of Contents" alt="Toggle Table of Contents" /></a></div> -<div id="masthead"> -<table cellpadding="0" cellspacing="0" border="0" style="width:100%"> -<tr> -<td><h1>CodeIgniter User Guide Version 2.0.3</h1></td> -<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td> -</tr> -</table> -</div> -<!-- END NAVIGATION --> - - -<!-- START BREADCRUMB --> -<table cellpadding="0" cellspacing="0" border="0" style="width:100%"> -<tr> -<td id="breadcrumb"> -<a href="http://codeigniter.com/">CodeIgniter Home</a> › -<a href="../index.html">User Guide Home</a> › -Trackback Class -</td> -<td id="searchbox"><form method="get" action="http://www.google.com/search"><input type="hidden" name="as_sitesearch" id="as_sitesearch" value="codeigniter.com/user_guide/" />Search User Guide <input type="text" class="input" style="width:200px;" name="q" id="q" size="31" maxlength="255" value="" /> <input type="submit" class="submit" name="sa" value="Go" /></form></td> -</tr> -</table> -<!-- END BREADCRUMB --> - -<br clear="all" /> - - -<!-- START CONTENT --> -<div id="content"> - - -<h1>Trackback Class</h1> - -<p>The Trackback Class provides functions that enable you to send and receive Trackback data.</p> - - -<p>If you are not familiar with Trackbacks you'll find more information <a href="http://en.wikipedia.org/wiki/Trackback">here</a>.</p> - -<h2>Initializing the Class</h2> - -<p>Like most other classes in CodeIgniter, the Trackback class is initialized in your controller using the <dfn>$this->load->library</dfn> function:</p> - -<code>$this->load->library('trackback');</code> -<p>Once loaded, the Trackback library object will be available using: <dfn>$this->trackback</dfn></p> - - -<h2>Sending Trackbacks</h2> - -<p>A Trackback can be sent from any of your controller functions using code similar to this example:</p> - -<code>$this->load->library('trackback');<br /> -<br /> -$tb_data = array(<br /> - 'ping_url' => 'http://example.com/trackback/456',<br /> - 'url' => 'http://www.my-example.com/blog/entry/123',<br /> - 'title' => 'The Title of My Entry',<br /> - 'excerpt' => 'The entry content.',<br /> - 'blog_name' => 'My Blog Name',<br /> - 'charset' => 'utf-8'<br /> - );<br /> -<br /> -if ( ! $this->trackback->send($tb_data))<br /> -{<br /> - echo $this->trackback->display_errors();<br /> -}<br /> -else<br /> -{<br /> - echo 'Trackback was sent!';<br /> -}</code> - -<p>Description of array data:</p> - -<ul> -<li><strong>ping_url</strong> - The URL of the site you are sending the Trackback to. You can send Trackbacks to multiple URLs by separating each URL with a comma.</li> -<li><strong>url</strong> - The URL to YOUR site where the weblog entry can be seen.</li> -<li><strong>title</strong> - The title of your weblog entry.</li> -<li><strong>excerpt</strong> - The content of your weblog entry. Note: the Trackback class will automatically send only the first 500 characters of your entry. It will also strip all HTML.</li> -<li><strong>blog_name</strong> - The name of your weblog.</li> -<li><strong>charset</strong> - The character encoding your weblog is written in. If omitted, UTF-8 will be used.</li> -</ul> - -<p>The Trackback sending function returns TRUE/FALSE (boolean) on success or failure. If it fails, you can retrieve the error message using:</p> - -<code>$this->trackback->display_errors();</code> - - -<h2>Receiving Trackbacks</h2> - -<p>Before you can receive Trackbacks you must create a weblog. If you don't have a blog yet there's no point in continuing.</p> - -<p>Receiving Trackbacks is a little more complex than sending them, only because you will need a database table in which to store them, -and you will need to validate the incoming trackback data. You are encouraged to implement a thorough validation process to -guard against spam and duplicate data. You may also want to limit the number of Trackbacks you allow from a particular IP within -a given span of time to further curtail spam. The process of receiving a Trackback is quite simple; -the validation is what takes most of the effort.</p> - -<h2>Your Ping URL</h2> - -<p>In order to accept Trackbacks you must display a Trackback URL next to each one of your weblog entries. This will be the URL -that people will use to send you Trackbacks (we will refer to this as your "Ping URL").</p> - -<p>Your Ping URL must point to a controller function where your Trackback receiving code is located, and the URL -must contain the ID number for each particular entry, so that when the Trackback is received you'll be -able to associate it with a particular entry.</p> - -<p>For example, if your controller class is called <dfn>Trackback</dfn>, and the receiving function is called <dfn>receive</dfn>, your -Ping URLs will look something like this:</p> - -<code>http://example.com/index.php/trackback/receive/<samp>entry_id</samp></code> - -<p>Where <samp>entry_id</samp> represents the individual ID number for each of your entries.</p> - - -<h2>Creating a Trackback Table</h2> - -<p>Before you can receive Trackbacks you must create a table in which to store them. Here is a basic prototype for such a table:</p> - -<textarea class="textarea" style="width:100%" cols="50" rows="13"> -CREATE TABLE trackbacks ( - tb_id int(10) unsigned NOT NULL auto_increment, - entry_id int(10) unsigned NOT NULL default 0, - url varchar(200) NOT NULL, - title varchar(100) NOT NULL, - excerpt text NOT NULL, - blog_name varchar(100) NOT NULL, - tb_date int(10) NOT NULL, - ip_address varchar(16) NOT NULL, - PRIMARY KEY `tb_id` (`tb_id`), - KEY `entry_id` (`entry_id`) -);</textarea> - - -<p>The Trackback specification only requires four pieces of information to be sent in a Trackback (url, title, excerpt, blog_name), -but to make the data more useful we've added a few more fields in the above table schema (date, IP address, etc.).</p> - -<h2>Processing a Trackback</h2> - -<p>Here is an example showing how you will receive and process a Trackback. The following -code is intended for use within the controller function where you expect to receive Trackbacks.</p> - -<code>$this->load->library('trackback');<br /> -$this->load->database();<br /> -<br /> -if ($this->uri->segment(3) == FALSE)<br /> -{<br /> - $this->trackback->send_error("Unable to determine the entry ID");<br /> -}<br /> -<br /> -if ( ! $this->trackback->receive())<br /> -{<br /> - $this->trackback->send_error("The Trackback did not contain valid data");<br /> -}<br /> -<br /> -$data = array(<br /> - 'tb_id' => '',<br /> - 'entry_id' => $this->uri->segment(3),<br /> - 'url' => $this->trackback->data('url'),<br /> - 'title' => $this->trackback->data('title'),<br /> - 'excerpt' => $this->trackback->data('excerpt'),<br /> - 'blog_name' => $this->trackback->data('blog_name'),<br /> - 'tb_date' => time(),<br /> - 'ip_address' => $this->input->ip_address()<br /> - );<br /> -<br /> -$sql = $this->db->insert_string('trackbacks', $data);<br /> -$this->db->query($sql);<br /> -<br /> -$this->trackback->send_success();</code> - -<h4>Notes:</h4> - -<p>The entry ID number is expected in the third segment of your URL. This is based on the URI example we gave earlier:</p> - -<code>http://example.com/index.php/trackback/receive/<samp>entry_id</samp></code> - -<p>Notice the entry_id is in the third URI segment, which you can retrieve using:</p> - -<code>$this->uri->segment(3);</code> - -<p>In our Trackback receiving code above, if the third segment is missing, we will issue an error. Without a valid entry ID, there's no -reason to continue.</p> - -<p>The <dfn>$this->trackback->receive()</dfn> function is simply a validation function that looks at the incoming data -and makes sure it contains the four pieces of data that are required (url, title, excerpt, blog_name). -It returns TRUE on success and FALSE on failure. If it fails you will issue an error message.</p> - -<p>The incoming Trackback data can be retrieved using this function:</p> - -<code>$this->trackback->data('<var>item</var>')</code> - -<p>Where <var>item</var> represents one of these four pieces of info: url, title, excerpt, or blog_name</p> - -<p>If the Trackback data is successfully received, you will issue a success message using:</p> - -<code>$this->trackback->send_success();</code> - -<p class="important"><strong>Note:</strong> The above code contains no data validation, which you are encouraged to add.</p> - - - - - -</div> -<!-- END CONTENT --> - - -<div id="footer"> -<p> -Previous Topic: <a href="sessions.html">Session Class</a> - · -<a href="#top">Top of Page</a> · -<a href="../index.html">User Guide Home</a> · -Next Topic: <a href="parser.html">Template Parser Class</a> -</p> -<p><a href="http://codeigniter.com">CodeIgniter</a> · Copyright © 2006 - 2011 · <a href="http://ellislab.com/">EllisLab, Inc.</a></p> -</div> - -</body> -</html>
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