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Relevant Search: With Applications for Solr and Elasticsearch

For more in depth reading about search, ranking and generally everything you could ever want to know about how lucene, elasticsearch or solr work under the hood I highly suggest this book. Easily one of the most interesting technical books I have read in a long time. If you are tasked with solving search relevance problems even if not in Solr or Elasticsearch it should be your first reference. Amazon Affiliate Link
https://bitbucket.org/bo_hmb/bo_hmb
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425  <div class="section" id="xml-helper">
426<h1>XML Helper<a class="headerlink" href="#xml-helper" title="Permalink to this headline"></a></h1>
427<p>The XML Helper file contains functions that assist in working with XML
428data.</p>
429<div class="contents local topic" id="contents">
430<ul class="simple">
431<li><a class="reference internal" href="#loading-this-helper" id="id1">Loading this Helper</a></li>
432<li><a class="reference internal" href="#available-functions" id="id2">Available Functions</a></li>
433</ul>
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436<h2><a class="toc-backref" href="#id1">Loading this Helper</a><a class="headerlink" href="#loading-this-helper" title="Permalink to this headline"></a></h2>
437<p>This helper is loaded using the following code</p>
438<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">helper</span><span class="p">(</span><span class="s1">&#39;xml&#39;</span><span class="p">);</span>
439</pre></div>
440</div>
441</div>
442<div class="section" id="available-functions">
443<h2><a class="toc-backref" href="#id2">Available Functions</a><a class="headerlink" href="#available-functions" title="Permalink to this headline"></a></h2>
444<p>The following functions are available:</p>
445<dl class="function">
446<dt id="xml_convert">
447<code class="descname">xml_convert</code><span class="sig-paren">(</span><em>$str</em><span class="optional">[</span>, <em>$protect_all = FALSE</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#xml_convert" title="Permalink to this definition"></a></dt>
448<dd><table class="docutils field-list" frame="void" rules="none">
449<col class="field-name" />
450<col class="field-body" />
451<tbody valign="top">
452<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
453<li><strong>$str</strong> (<em>string</em>) – the text string to convert</li>
454<li><strong>$protect_all</strong> (<em>bool</em>) – Whether to protect all content that looks like a potential entity instead of just numbered entities, e.g. &amp;foo;</li>
455</ul>
456</td>
457</tr>
458<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">XML-converted string</p>
459</td>
460</tr>
461<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
462</td>
463</tr>
464</tbody>
465</table>
466<p>Takes a string as input and converts the following reserved XML
467characters to entities:</p>
468<blockquote>
469<div><ul class="simple">
470<li>Ampersands: &amp;</li>
471<li>Less than and greater than characters: &lt; &gt;</li>
472<li>Single and double quotes: ‘ “</li>
473<li>Dashes: -</li>
474</ul>
475</div></blockquote>
476<p>This function ignores ampersands if they are part of existing numbered
477character entities, e.g. &amp;#123;. Example:</p>
478<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$string</span> <span class="o">=</span> <span class="s1">&#39;&lt;p&gt;Here is a paragraph &amp; an entity (&amp;#123;).&lt;/p&gt;&#39;</span><span class="p">;</span>
479<span class="nv">$string</span> <span class="o">=</span> <span class="nx">xml_convert</span><span class="p">(</span><span class="nv">$string</span><span class="p">);</span>
480<span class="k">echo</span> <span class="nv">$string</span><span class="p">;</span>
481</pre></div>
482</div>
483<p>outputs:</p>
484<div class="highlight-html"><div class="highlight"><pre><span></span><span class="ni">&amp;lt;</span>p<span class="ni">&amp;gt;</span>Here is a paragraph <span class="ni">&amp;amp;</span> an entity (<span class="ni">&amp;#123;</span>).<span class="ni">&amp;lt;</span>/p<span class="ni">&amp;gt;</span>
485</pre></div>
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