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391 </div>
392 &nbsp;
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394
395 <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap">
396
397
398 <nav class="wy-nav-top" role="navigation" aria-label="top navigation">
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409 <li><a href="../index.html">Docs</a> &raquo;</li>
410
411 <li><a href="index.html">Libraries</a> &raquo;</li>
412
413 <li>Trackback Class</li>
414 <li class="wy-breadcrumbs-aside">
415
416 </li>
417 <div style="float:right;margin-left:5px;" id="closeMe">
418 <img title="Classic Layout" alt="classic layout" src="data:image/gif;base64,R0lGODlhFAAUAJEAAAAAADMzM////wAAACH5BAUUAAIALAAAAAAUABQAAAImlI+py+0PU5gRBRDM3DxbWoXis42X13USOLauUIqnlsaH/eY6UwAAOw==" />
419 </div>
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422</div>
423 <div role="main" class="document">
424
425 <div class="section" id="trackback-class">
426<h1>Trackback Class<a class="headerlink" href="#trackback-class" title="Permalink to this headline"></a></h1>
427<p>The Trackback Class provides functions that enable you to send and
428receive Trackback data.</p>
429<p>If you are not familiar with Trackbacks you’ll find more information
430<a class="reference external" href="http://en.wikipedia.org/wiki/Trackback">here</a>.</p>
431<div class="contents local topic" id="contents">
432<ul class="simple">
433<li><a class="reference internal" href="#using-the-trackback-class" id="id1">Using the Trackback Class</a><ul>
434<li><a class="reference internal" href="#initializing-the-class" id="id2">Initializing the Class</a></li>
435<li><a class="reference internal" href="#sending-trackbacks" id="id3">Sending Trackbacks</a></li>
436<li><a class="reference internal" href="#receiving-trackbacks" id="id4">Receiving Trackbacks</a></li>
437<li><a class="reference internal" href="#your-ping-url" id="id5">Your Ping URL</a></li>
438<li><a class="reference internal" href="#creating-a-trackback-table" id="id6">Creating a Trackback Table</a></li>
439<li><a class="reference internal" href="#processing-a-trackback" id="id7">Processing a Trackback</a><ul>
440<li><a class="reference internal" href="#notes" id="id8">Notes:</a></li>
441</ul>
442</li>
443</ul>
444</li>
445<li><a class="reference internal" href="#class-reference" id="id9">Class Reference</a></li>
446</ul>
447</div>
448<div class="custom-index container"></div><div class="section" id="using-the-trackback-class">
449<h2><a class="toc-backref" href="#id1">Using the Trackback Class</a><a class="headerlink" href="#using-the-trackback-class" title="Permalink to this headline"></a></h2>
450<div class="section" id="initializing-the-class">
451<h3><a class="toc-backref" href="#id2">Initializing the Class</a><a class="headerlink" href="#initializing-the-class" title="Permalink to this headline"></a></h3>
452<p>Like most other classes in CodeIgniter, the Trackback class is
453initialized in your controller using the <code class="docutils literal"><span class="pre">$this-&gt;load-&gt;library()</span></code> method:</p>
454<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;trackback&#39;</span><span class="p">);</span>
455</pre></div>
456</div>
457<p>Once loaded, the Trackback library object will be available using:</p>
458<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">trackback</span>
459</pre></div>
460</div>
461</div>
462<div class="section" id="sending-trackbacks">
463<h3><a class="toc-backref" href="#id3">Sending Trackbacks</a><a class="headerlink" href="#sending-trackbacks" title="Permalink to this headline"></a></h3>
464<p>A Trackback can be sent from any of your controller functions using code
465similar to this example:</p>
466<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;trackback&#39;</span><span class="p">);</span>
467
468<span class="nv">$tb_data</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
469 <span class="s1">&#39;ping_url&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;http://example.com/trackback/456&#39;</span><span class="p">,</span>
470 <span class="s1">&#39;url&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;http://www.my-example.com/blog/entry/123&#39;</span><span class="p">,</span>
471 <span class="s1">&#39;title&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;The Title of My Entry&#39;</span><span class="p">,</span>
472 <span class="s1">&#39;excerpt&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;The entry content.&#39;</span><span class="p">,</span>
473 <span class="s1">&#39;blog_name&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;My Blog Name&#39;</span><span class="p">,</span>
474 <span class="s1">&#39;charset&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;utf-8&#39;</span>
475<span class="p">);</span>
476
477<span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">trackback</span><span class="o">-&gt;</span><span class="na">send</span><span class="p">(</span><span class="nv">$tb_data</span><span class="p">))</span>
478<span class="p">{</span>
479 <span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">trackback</span><span class="o">-&gt;</span><span class="na">display_errors</span><span class="p">();</span>
480<span class="p">}</span>
481<span class="k">else</span>
482<span class="p">{</span>
483 <span class="k">echo</span> <span class="s1">&#39;Trackback was sent!&#39;</span><span class="p">;</span>
484<span class="p">}</span>
485</pre></div>
486</div>
487<p>Description of array data:</p>
488<ul class="simple">
489<li><strong>ping_url</strong> - The URL of the site you are sending the Trackback to.
490You can send Trackbacks to multiple URLs by separating each URL with a comma.</li>
491<li><strong>url</strong> - The URL to YOUR site where the weblog entry can be seen.</li>
492<li><strong>title</strong> - The title of your weblog entry.</li>
493<li><strong>excerpt</strong> - The content of your weblog entry.</li>
494<li><strong>blog_name</strong> - The name of your weblog.</li>
495<li><strong>charset</strong> - The character encoding your weblog is written in. If omitted, UTF-8 will be used.</li>
496</ul>
497<div class="admonition note">
498<p class="first admonition-title">Note</p>
499<p class="last">The Trackback class will automatically send only the first 500 characters of your
500entry. It will also strip all HTML.</p>
501</div>
502<p>The Trackback sending method returns TRUE/FALSE (boolean) on success
503or failure. If it fails, you can retrieve the error message using:</p>
504<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">trackback</span><span class="o">-&gt;</span><span class="na">display_errors</span><span class="p">();</span>
505</pre></div>
506</div>
507</div>
508<div class="section" id="receiving-trackbacks">
509<h3><a class="toc-backref" href="#id4">Receiving Trackbacks</a><a class="headerlink" href="#receiving-trackbacks" title="Permalink to this headline"></a></h3>
510<p>Before you can receive Trackbacks you must create a weblog. If you don’t
511have a blog yet there’s no point in continuing.</p>
512<p>Receiving Trackbacks is a little more complex than sending them, only
513because you will need a database table in which to store them, and you
514will need to validate the incoming trackback data. You are encouraged to
515implement a thorough validation process to guard against spam and
516duplicate data. You may also want to limit the number of Trackbacks you
517allow from a particular IP within a given span of time to further
518curtail spam. The process of receiving a Trackback is quite simple; the
519validation is what takes most of the effort.</p>
520</div>
521<div class="section" id="your-ping-url">
522<h3><a class="toc-backref" href="#id5">Your Ping URL</a><a class="headerlink" href="#your-ping-url" title="Permalink to this headline"></a></h3>
523<p>In order to accept Trackbacks you must display a Trackback URL next to
524each one of your weblog entries. This will be the URL that people will
525use to send you Trackbacks (we will refer to this as your “Ping URL”).</p>
526<p>Your Ping URL must point to a controller function where your Trackback
527receiving code is located, and the URL must contain the ID number for
528each particular entry, so that when the Trackback is received you’ll be
529able to associate it with a particular entry.</p>
530<p>For example, if your controller class is called Trackback, and the
531receiving function is called receive, your Ping URLs will look something
532like this:</p>
533<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">http</span><span class="o">://</span><span class="nx">example</span><span class="o">.</span><span class="nx">com</span><span class="o">/</span><span class="nx">index</span><span class="o">.</span><span class="nx">php</span><span class="o">/</span><span class="nx">trackback</span><span class="o">/</span><span class="nx">receive</span><span class="o">/</span><span class="nx">entry_id</span>
534</pre></div>
535</div>
536<p>Where entry_id represents the individual ID number for each of your
537entries.</p>
538</div>
539<div class="section" id="creating-a-trackback-table">
540<h3><a class="toc-backref" href="#id6">Creating a Trackback Table</a><a class="headerlink" href="#creating-a-trackback-table" title="Permalink to this headline"></a></h3>
541<p>Before you can receive Trackbacks you must create a table in which to
542store them. Here is a basic prototype for such a table:</p>
543<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">CREATE</span> <span class="nx">TABLE</span> <span class="nx">trackbacks</span> <span class="p">(</span>
544 <span class="nx">tb_id</span> <span class="nx">int</span><span class="p">(</span><span class="mi">10</span><span class="p">)</span> <span class="nx">unsigned</span> <span class="k">NOT</span> <span class="k">NULL</span> <span class="nx">auto_increment</span><span class="p">,</span>
545 <span class="nx">entry_id</span> <span class="nx">int</span><span class="p">(</span><span class="mi">10</span><span class="p">)</span> <span class="nx">unsigned</span> <span class="k">NOT</span> <span class="k">NULL</span> <span class="k">default</span> <span class="mi">0</span><span class="p">,</span>
546 <span class="nx">url</span> <span class="nx">varchar</span><span class="p">(</span><span class="mi">200</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span>
547 <span class="nx">title</span> <span class="nx">varchar</span><span class="p">(</span><span class="mi">100</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span>
548 <span class="nx">excerpt</span> <span class="nx">text</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span>
549 <span class="nx">blog_name</span> <span class="nx">varchar</span><span class="p">(</span><span class="mi">100</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span>
550 <span class="nx">tb_date</span> <span class="nx">int</span><span class="p">(</span><span class="mi">10</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span>
551 <span class="nx">ip_address</span> <span class="nx">varchar</span><span class="p">(</span><span class="mi">45</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">,</span>
552 <span class="nx">PRIMARY</span> <span class="nx">KEY</span> <span class="sb">`tb_id`</span> <span class="p">(</span><span class="sb">`tb_id`</span><span class="p">),</span>
553 <span class="nx">KEY</span> <span class="sb">`entry_id`</span> <span class="p">(</span><span class="sb">`entry_id`</span><span class="p">)</span>
554<span class="p">);</span>
555</pre></div>
556</div>
557<p>The Trackback specification only requires four pieces of information to
558be sent in a Trackback (url, title, excerpt, blog_name), but to make
559the data more useful we’ve added a few more fields in the above table
560schema (date, IP address, etc.).</p>
561</div>
562<div class="section" id="processing-a-trackback">
563<h3><a class="toc-backref" href="#id7">Processing a Trackback</a><a class="headerlink" href="#processing-a-trackback" title="Permalink to this headline"></a></h3>
564<p>Here is an example showing how you will receive and process a Trackback.
565The following code is intended for use within the controller function
566where you expect to receive Trackbacks.:</p>
567<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;trackback&#39;</span><span class="p">);</span>
568<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">database</span><span class="p">();</span>
569
570<span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">uri</span><span class="o">-&gt;</span><span class="na">segment</span><span class="p">(</span><span class="mi">3</span><span class="p">)</span> <span class="o">==</span> <span class="k">FALSE</span><span class="p">)</span>
571<span class="p">{</span>
572 <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">trackback</span><span class="o">-&gt;</span><span class="na">send_error</span><span class="p">(</span><span class="s1">&#39;Unable to determine the entry ID&#39;</span><span class="p">);</span>
573<span class="p">}</span>
574
575<span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">trackback</span><span class="o">-&gt;</span><span class="na">receive</span><span class="p">())</span>
576<span class="p">{</span>
577 <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">trackback</span><span class="o">-&gt;</span><span class="na">send_error</span><span class="p">(</span><span class="s1">&#39;The Trackback did not contain valid data&#39;</span><span class="p">);</span>
578<span class="p">}</span>
579
580<span class="nv">$data</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
581 <span class="s1">&#39;tb_id&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;&#39;</span><span class="p">,</span>
582 <span class="s1">&#39;entry_id&#39;</span> <span class="o">=&gt;</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">uri</span><span class="o">-&gt;</span><span class="na">segment</span><span class="p">(</span><span class="mi">3</span><span class="p">),</span>
583 <span class="s1">&#39;url&#39;</span> <span class="o">=&gt;</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">trackback</span><span class="o">-&gt;</span><span class="na">data</span><span class="p">(</span><span class="s1">&#39;url&#39;</span><span class="p">),</span>
584 <span class="s1">&#39;title&#39;</span> <span class="o">=&gt;</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">trackback</span><span class="o">-&gt;</span><span class="na">data</span><span class="p">(</span><span class="s1">&#39;title&#39;</span><span class="p">),</span>
585 <span class="s1">&#39;excerpt&#39;</span> <span class="o">=&gt;</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">trackback</span><span class="o">-&gt;</span><span class="na">data</span><span class="p">(</span><span class="s1">&#39;excerpt&#39;</span><span class="p">),</span>
586 <span class="s1">&#39;blog_name&#39;</span> <span class="o">=&gt;</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">trackback</span><span class="o">-&gt;</span><span class="na">data</span><span class="p">(</span><span class="s1">&#39;blog_name&#39;</span><span class="p">),</span>
587 <span class="s1">&#39;tb_date&#39;</span> <span class="o">=&gt;</span> <span class="nb">time</span><span class="p">(),</span>
588 <span class="s1">&#39;ip_address&#39;</span> <span class="o">=&gt;</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">input</span><span class="o">-&gt;</span><span class="na">ip_address</span><span class="p">()</span>
589<span class="p">);</span>
590
591<span class="nv">$sql</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">insert_string</span><span class="p">(</span><span class="s1">&#39;trackbacks&#39;</span><span class="p">,</span> <span class="nv">$data</span><span class="p">);</span>
592<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">query</span><span class="p">(</span><span class="nv">$sql</span><span class="p">);</span>
593
594<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">trackback</span><span class="o">-&gt;</span><span class="na">send_success</span><span class="p">();</span>
595</pre></div>
596</div>
597<div class="section" id="notes">
598<h4><a class="toc-backref" href="#id8">Notes:</a><a class="headerlink" href="#notes" title="Permalink to this headline"></a></h4>
599<p>The entry ID number is expected in the third segment of your URL. This
600is based on the URI example we gave earlier:</p>
601<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">http</span><span class="o">://</span><span class="nx">example</span><span class="o">.</span><span class="nx">com</span><span class="o">/</span><span class="nx">index</span><span class="o">.</span><span class="nx">php</span><span class="o">/</span><span class="nx">trackback</span><span class="o">/</span><span class="nx">receive</span><span class="o">/</span><span class="nx">entry_id</span>
602</pre></div>
603</div>
604<p>Notice the entry_id is in the third URI segment, which you can retrieve
605using:</p>
606<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">uri</span><span class="o">-&gt;</span><span class="na">segment</span><span class="p">(</span><span class="mi">3</span><span class="p">);</span>
607</pre></div>
608</div>
609<p>In our Trackback receiving code above, if the third segment is missing,
610we will issue an error. Without a valid entry ID, there’s no reason to
611continue.</p>
612<p>The $this-&gt;trackback-&gt;receive() function is simply a validation function
613that looks at the incoming data and makes sure it contains the four
614pieces of data that are required (url, title, excerpt, blog_name). It
615returns TRUE on success and FALSE on failure. If it fails you will issue
616an error message.</p>
617<p>The incoming Trackback data can be retrieved using this function:</p>
618<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">trackback</span><span class="o">-&gt;</span><span class="na">data</span><span class="p">(</span><span class="s1">&#39;item&#39;</span><span class="p">)</span>
619</pre></div>
620</div>
621<p>Where item represents one of these four pieces of info: url, title,
622excerpt, or blog_name</p>
623<p>If the Trackback data is successfully received, you will issue a success
624message using:</p>
625<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">trackback</span><span class="o">-&gt;</span><span class="na">send_success</span><span class="p">();</span>
626</pre></div>
627</div>
628<div class="admonition note">
629<p class="first admonition-title">Note</p>
630<p class="last">The above code contains no data validation, which you are
631encouraged to add.</p>
632</div>
633</div>
634</div>
635</div>
636<div class="section" id="class-reference">
637<h2><a class="toc-backref" href="#id9">Class Reference</a><a class="headerlink" href="#class-reference" title="Permalink to this headline"></a></h2>
638<dl class="class">
639<dt id="CI_Trackback">
640<em class="property">class </em><code class="descname">CI_Trackback</code><a class="headerlink" href="#CI_Trackback" title="Permalink to this definition"></a></dt>
641<dd><dl class="attribute">
642<dt>
643<code class="descname">$data = array('url' =&gt; '', 'title' =&gt; '', 'excerpt' =&gt; '', 'blog_name' =&gt; '', 'charset' =&gt; '')</code></dt>
644<dd><p>Trackback data array.</p>
645</dd></dl>
646
647<dl class="attribute">
648<dt>
649<code class="descname">$convert_ascii = TRUE</code></dt>
650<dd><p>Whether to convert high ASCII and MS Word characters to HTML entities.</p>
651</dd></dl>
652
653<dl class="method">
654<dt id="CI_Trackback::send">
655<code class="descname">send</code><span class="sig-paren">(</span><em>$tb_data</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Trackback::send" title="Permalink to this definition"></a></dt>
656<dd><table class="docutils field-list" frame="void" rules="none">
657<col class="field-name" />
658<col class="field-body" />
659<tbody valign="top">
660<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
661<li><strong>$tb_data</strong> (<em>array</em>) – Trackback data</li>
662</ul>
663</td>
664</tr>
665<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
666</td>
667</tr>
668<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
669</td>
670</tr>
671</tbody>
672</table>
673<p>Send trackback.</p>
674</dd></dl>
675
676<dl class="method">
677<dt id="CI_Trackback::receive">
678<code class="descname">receive</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Trackback::receive" title="Permalink to this definition"></a></dt>
679<dd><table class="docutils field-list" frame="void" rules="none">
680<col class="field-name" />
681<col class="field-body" />
682<tbody valign="top">
683<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">TRUE on success, FALSE on failure</td>
684</tr>
685<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">bool</td>
686</tr>
687</tbody>
688</table>
689<p>This method simply validates the incoming TB data, returning TRUE on success and FALSE on failure.
690If the data is valid it is set to the <code class="docutils literal"><span class="pre">$this-&gt;data</span></code> array so that it can be inserted into a database.</p>
691</dd></dl>
692
693<dl class="method">
694<dt id="CI_Trackback::send_error">
695<code class="descname">send_error</code><span class="sig-paren">(</span><span class="optional">[</span><em>$message = 'Incomplete information'</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Trackback::send_error" title="Permalink to this definition"></a></dt>
696<dd><table class="docutils field-list" frame="void" rules="none">
697<col class="field-name" />
698<col class="field-body" />
699<tbody valign="top">
700<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
701<li><strong>$message</strong> (<em>string</em>) – Error message</li>
702</ul>
703</td>
704</tr>
705<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p>
706</td>
707</tr>
708</tbody>
709</table>
710<p>Responses to a trackback request with an error message.</p>
711<div class="admonition note">
712<p class="first admonition-title">Note</p>
713<p class="last">This method will terminate script execution.</p>
714</div>
715</dd></dl>
716
717<dl class="method">
718<dt id="CI_Trackback::send_success">
719<code class="descname">send_success</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Trackback::send_success" title="Permalink to this definition"></a></dt>
720<dd><table class="docutils field-list" frame="void" rules="none">
721<col class="field-name" />
722<col class="field-body" />
723<tbody valign="top">
724<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">void</td>
725</tr>
726</tbody>
727</table>
728<p>Responses to a trackback request with a success message.</p>
729<div class="admonition note">
730<p class="first admonition-title">Note</p>
731<p class="last">This method will terminate script execution.</p>
732</div>
733</dd></dl>
734
735<dl class="method">
736<dt id="CI_Trackback::data">
737<code class="descname">data</code><span class="sig-paren">(</span><em>$item</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Trackback::data" title="Permalink to this definition"></a></dt>
738<dd><table class="docutils field-list" frame="void" rules="none">
739<col class="field-name" />
740<col class="field-body" />
741<tbody valign="top">
742<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
743<li><strong>$item</strong> (<em>string</em>) – Data key</li>
744</ul>
745</td>
746</tr>
747<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Data value or empty string if not found</p>
748</td>
749</tr>
750<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
751</td>
752</tr>
753</tbody>
754</table>
755<p>Returns a single item from the response data array.</p>
756</dd></dl>
757
758<dl class="method">
759<dt id="CI_Trackback::process">
760<code class="descname">process</code><span class="sig-paren">(</span><em>$url</em>, <em>$data</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Trackback::process" title="Permalink to this definition"></a></dt>
761<dd><table class="docutils field-list" frame="void" rules="none">
762<col class="field-name" />
763<col class="field-body" />
764<tbody valign="top">
765<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
766<li><strong>$url</strong> (<em>string</em>) – Target url</li>
767<li><strong>$data</strong> (<em>string</em>) – Raw POST data</li>
768</ul>
769</td>
770</tr>
771<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
772</td>
773</tr>
774<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
775</td>
776</tr>
777</tbody>
778</table>
779<p>Opens a socket connection and passes the data to the server, returning TRUE on success and FALSE on failure.</p>
780</dd></dl>
781
782<dl class="method">
783<dt id="CI_Trackback::extract_urls">
784<code class="descname">extract_urls</code><span class="sig-paren">(</span><em>$urls</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Trackback::extract_urls" title="Permalink to this definition"></a></dt>
785<dd><table class="docutils field-list" frame="void" rules="none">
786<col class="field-name" />
787<col class="field-body" />
788<tbody valign="top">
789<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
790<li><strong>$urls</strong> (<em>string</em>) – Comma-separated URL list</li>
791</ul>
792</td>
793</tr>
794<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Array of URLs</p>
795</td>
796</tr>
797<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">array</p>
798</td>
799</tr>
800</tbody>
801</table>
802<p>This method lets multiple trackbacks to be sent. It takes a string of URLs (separated by comma or space) and puts each URL into an array.</p>
803</dd></dl>
804
805<dl class="method">
806<dt id="CI_Trackback::validate_url">
807<code class="descname">validate_url</code><span class="sig-paren">(</span><em>&amp;$url</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Trackback::validate_url" title="Permalink to this definition"></a></dt>
808<dd><table class="docutils field-list" frame="void" rules="none">
809<col class="field-name" />
810<col class="field-body" />
811<tbody valign="top">
812<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
813<li><strong>$url</strong> (<em>string</em>) – Trackback URL</li>
814</ul>
815</td>
816</tr>
817<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p>
818</td>
819</tr>
820</tbody>
821</table>
822<p>Simply adds the <em>http://</em> prefix it it’s not already present in the URL.</p>
823</dd></dl>
824
825<dl class="method">
826<dt id="CI_Trackback::get_id">
827<code class="descname">get_id</code><span class="sig-paren">(</span><em>$url</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Trackback::get_id" title="Permalink to this definition"></a></dt>
828<dd><table class="docutils field-list" frame="void" rules="none">
829<col class="field-name" />
830<col class="field-body" />
831<tbody valign="top">
832<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
833<li><strong>$url</strong> (<em>string</em>) – Trackback URL</li>
834</ul>
835</td>
836</tr>
837<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">URL ID or FALSE on failure</p>
838</td>
839</tr>
840<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
841</td>
842</tr>
843</tbody>
844</table>
845<p>Find and return a trackback URL’s ID or FALSE on failure.</p>
846</dd></dl>
847
848<dl class="method">
849<dt id="CI_Trackback::convert_xml">
850<code class="descname">convert_xml</code><span class="sig-paren">(</span><em>$str</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Trackback::convert_xml" title="Permalink to this definition"></a></dt>
851<dd><table class="docutils field-list" frame="void" rules="none">
852<col class="field-name" />
853<col class="field-body" />
854<tbody valign="top">
855<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
856<li><strong>$str</strong> (<em>string</em>) – Input string</li>
857</ul>
858</td>
859</tr>
860<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Converted string</p>
861</td>
862</tr>
863<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
864</td>
865</tr>
866</tbody>
867</table>
868<p>Converts reserved XML characters to entities.</p>
869</dd></dl>
870
871<dl class="method">
872<dt id="CI_Trackback::limit_characters">
873<code class="descname">limit_characters</code><span class="sig-paren">(</span><em>$str</em><span class="optional">[</span>, <em>$n = 500</em><span class="optional">[</span>, <em>$end_char = '&amp;#8230;'</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Trackback::limit_characters" title="Permalink to this definition"></a></dt>
874<dd><table class="docutils field-list" frame="void" rules="none">
875<col class="field-name" />
876<col class="field-body" />
877<tbody valign="top">
878<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
879<li><strong>$str</strong> (<em>string</em>) – Input string</li>
880<li><strong>$n</strong> (<em>int</em>) – Max characters number</li>
881<li><strong>$end_char</strong> (<em>string</em>) – Character to put at end of string</li>
882</ul>
883</td>
884</tr>
885<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Shortened string</p>
886</td>
887</tr>
888<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
889</td>
890</tr>
891</tbody>
892</table>
893<p>Limits the string based on the character count. Will preserve complete words.</p>
894</dd></dl>
895
896<dl class="method">
897<dt id="CI_Trackback::convert_ascii">
898<code class="descname">convert_ascii</code><span class="sig-paren">(</span><em>$str</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Trackback::convert_ascii" title="Permalink to this definition"></a></dt>
899<dd><table class="docutils field-list" frame="void" rules="none">
900<col class="field-name" />
901<col class="field-body" />
902<tbody valign="top">
903<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
904<li><strong>$str</strong> (<em>string</em>) – Input string</li>
905</ul>
906</td>
907</tr>
908<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Converted string</p>
909</td>
910</tr>
911<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
912</td>
913</tr>
914</tbody>
915</table>
916<p>Converts high ASCII text and MS Word special characterss to HTML entities.</p>
917</dd></dl>
918
919<dl class="method">
920<dt id="CI_Trackback::set_error">
921<code class="descname">set_error</code><span class="sig-paren">(</span><em>$msg</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Trackback::set_error" title="Permalink to this definition"></a></dt>
922<dd><table class="docutils field-list" frame="void" rules="none">
923<col class="field-name" />
924<col class="field-body" />
925<tbody valign="top">
926<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
927<li><strong>$msg</strong> (<em>string</em>) – Error message</li>
928</ul>
929</td>
930</tr>
931<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p>
932</td>
933</tr>
934</tbody>
935</table>
936<p>Set an log an error message.</p>
937</dd></dl>
938
939<dl class="method">
940<dt id="CI_Trackback::display_errors">
941<code class="descname">display_errors</code><span class="sig-paren">(</span><span class="optional">[</span><em>$open = '&lt;p&gt;'</em><span class="optional">[</span>, <em>$close = '&lt;/p&gt;'</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Trackback::display_errors" title="Permalink to this definition"></a></dt>
942<dd><table class="docutils field-list" frame="void" rules="none">
943<col class="field-name" />
944<col class="field-body" />
945<tbody valign="top">
946<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
947<li><strong>$open</strong> (<em>string</em>) – Open tag</li>
948<li><strong>$close</strong> (<em>string</em>) – Close tag</li>
949</ul>
950</td>
951</tr>
952<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">HTML formatted error messages</p>
953</td>
954</tr>
955<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
956</td>
957</tr>
958</tbody>
959</table>
960<p>Returns error messages formatted in HTML or an empty string if there are no errors.</p>
961</dd></dl>
962
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