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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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427  <div class="section" id="upgrading-from-3-0-2-to-3-0-3">
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429<p>Before performing an update you should take your site offline by
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431<div class="section" id="step-1-update-your-codeigniter-files">
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453remember that <em>application/config/config.php</em> is still a PHP script, in
454which you can create this logic with a few lines of code. For example:</p>
455<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$allowed_domains</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;domain1.tld&#39;</span><span class="p">,</span> <span class="s1">&#39;domain2.tld&#39;</span><span class="p">);</span>
456<span class="nv">$default_domain</span>  <span class="o">=</span> <span class="s1">&#39;domain1.tld&#39;</span><span class="p">;</span>
457
458<span class="k">if</span> <span class="p">(</span><span class="nb">in_array</span><span class="p">(</span><span class="nv">$_SERVER</span><span class="p">[</span><span class="s1">&#39;HTTP_HOST&#39;</span><span class="p">],</span> <span class="nv">$allowed_domains</span><span class="p">,</span> <span class="k">TRUE</span><span class="p">))</span>
459<span class="p">{</span>
460        <span class="nv">$domain</span> <span class="o">=</span> <span class="nv">$_SERVER</span><span class="p">[</span><span class="s1">&#39;HTTP_HOST&#39;</span><span class="p">];</span>
461<span class="p">}</span>
462<span class="k">else</span>
463<span class="p">{</span>
464        <span class="nv">$domain</span> <span class="o">=</span> <span class="nv">$default_domain</span><span class="p">;</span>
465<span class="p">}</span>
466
467<span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="k">empty</span><span class="p">(</span><span class="nv">$_SERVER</span><span class="p">[</span><span class="s1">&#39;HTTPS&#39;</span><span class="p">]))</span>
468<span class="p">{</span>
469        <span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;base_url&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;https://&#39;</span><span class="o">.</span><span class="nv">$domain</span><span class="p">;</span>
470<span class="p">}</span>
471<span class="k">else</span>
472<span class="p">{</span>
473        <span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;base_url&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;http://&#39;</span><span class="o">.</span><span class="nv">$domain</span><span class="p">;</span>
474<span class="p">}</span>
475</pre></div>
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