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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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359</ul>
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388
389          
390        
391      </div>
392      &nbsp;
393    </nav>
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">
399        <i data-toggle="wy-nav-top" class="fa fa-bars"></i>
400        <a href="../index.html">CodeIgniter</a>
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409    <li><a href="../index.html">Docs</a> &raquo;</li>
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413    <li>File Uploading Class</li>
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415      
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418      <img title="Classic Layout" alt="classic layout" src="data:image/gif;base64,R0lGODlhFAAUAJEAAAAAADMzM////wAAACH5BAUUAAIALAAAAAAUABQAAAImlI+py+0PU5gRBRDM3DxbWoXis42X13USOLauUIqnlsaH/eY6UwAAOw==" />
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423          <div role="main" class="document">
424            
425  <div class="section" id="file-uploading-class">
426<h1>File Uploading Class<a class="headerlink" href="#file-uploading-class" title="Permalink to this headline"></a></h1>
427<p>CodeIgniter’s File Uploading Class permits files to be uploaded. You can
428set various preferences, restricting the type and size of the files.</p>
429<div class="contents local topic" id="contents">
430<ul class="simple">
431<li><a class="reference internal" href="#the-process" id="id1">The Process</a><ul>
432<li><a class="reference internal" href="#creating-the-upload-form" id="id2">Creating the Upload Form</a></li>
433<li><a class="reference internal" href="#the-success-page" id="id3">The Success Page</a></li>
434<li><a class="reference internal" href="#the-controller" id="id4">The Controller</a></li>
435<li><a class="reference internal" href="#the-upload-directory" id="id5">The Upload Directory</a></li>
436<li><a class="reference internal" href="#try-it" id="id6">Try it!</a></li>
437</ul>
438</li>
439<li><a class="reference internal" href="#reference-guide" id="id7">Reference Guide</a><ul>
440<li><a class="reference internal" href="#initializing-the-upload-class" id="id8">Initializing the Upload Class</a></li>
441<li><a class="reference internal" href="#setting-preferences" id="id9">Setting Preferences</a></li>
442<li><a class="reference internal" href="#preferences" id="id10">Preferences</a></li>
443<li><a class="reference internal" href="#setting-preferences-in-a-config-file" id="id11">Setting preferences in a config file</a></li>
444</ul>
445</li>
446<li><a class="reference internal" href="#class-reference" id="id12">Class Reference</a></li>
447</ul>
448</div>
449<div class="custom-index container"></div><div class="section" id="the-process">
450<h2><a class="toc-backref" href="#id1">The Process</a><a class="headerlink" href="#the-process" title="Permalink to this headline"></a></h2>
451<p>Uploading a file involves the following general process:</p>
452<ul class="simple">
453<li>An upload form is displayed, allowing a user to select a file and
454upload it.</li>
455<li>When the form is submitted, the file is uploaded to the destination
456you specify.</li>
457<li>Along the way, the file is validated to make sure it is allowed to be
458uploaded based on the preferences you set.</li>
459<li>Once uploaded, the user will be shown a success message.</li>
460</ul>
461<p>To demonstrate this process here is brief tutorial. Afterward you’ll
462find reference information.</p>
463<div class="section" id="creating-the-upload-form">
464<h3><a class="toc-backref" href="#id2">Creating the Upload Form</a><a class="headerlink" href="#creating-the-upload-form" title="Permalink to this headline"></a></h3>
465<p>Using a text editor, create a form called upload_form.php. In it, place
466this code and save it to your <strong>application/views/</strong> directory:</p>
467<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o">&lt;</span><span class="nx">html</span><span class="o">&gt;</span>
468<span class="o">&lt;</span><span class="nx">head</span><span class="o">&gt;</span>
469<span class="o">&lt;</span><span class="nx">title</span><span class="o">&gt;</span><span class="nx">Upload</span> <span class="nx">Form</span><span class="o">&lt;/</span><span class="nx">title</span><span class="o">&gt;</span>
470<span class="o">&lt;/</span><span class="nx">head</span><span class="o">&gt;</span>
471<span class="o">&lt;</span><span class="nx">body</span><span class="o">&gt;</span>
472
473<span class="o">&lt;?</span><span class="nx">php</span> <span class="k">echo</span> <span class="nv">$error</span><span class="p">;</span><span class="cp">?&gt;</span>
474
475<span class="cp">&lt;?php</span> <span class="k">echo</span> <span class="nx">form_open_multipart</span><span class="p">(</span><span class="s1">&#39;upload/do_upload&#39;</span><span class="p">);</span><span class="cp">?&gt;</span>
476
477<span class="p">&lt;</span><span class="nt">input</span> <span class="na">type</span><span class="o">=</span><span class="s">&quot;file&quot;</span> <span class="na">name</span><span class="o">=</span><span class="s">&quot;userfile&quot;</span> <span class="na">size</span><span class="o">=</span><span class="s">&quot;20&quot;</span> <span class="p">/&gt;</span>
478
479<span class="p">&lt;</span><span class="nt">br</span> <span class="p">/&gt;&lt;</span><span class="nt">br</span> <span class="p">/&gt;</span>
480
481<span class="p">&lt;</span><span class="nt">input</span> <span class="na">type</span><span class="o">=</span><span class="s">&quot;submit&quot;</span> <span class="na">value</span><span class="o">=</span><span class="s">&quot;upload&quot;</span> <span class="p">/&gt;</span>
482
483<span class="p">&lt;/</span><span class="nt">form</span><span class="p">&gt;</span>
484
485<span class="p">&lt;/</span><span class="nt">body</span><span class="p">&gt;</span>
486<span class="p">&lt;/</span><span class="nt">html</span><span class="p">&gt;</span>
487</pre></div>
488</div>
489<p>You’ll notice we are using a form helper to create the opening form tag.
490File uploads require a multipart form, so the helper creates the proper
491syntax for you. You’ll also notice we have an $error variable. This is
492so we can show error messages in the event the user does something
493wrong.</p>
494</div>
495<div class="section" id="the-success-page">
496<h3><a class="toc-backref" href="#id3">The Success Page</a><a class="headerlink" href="#the-success-page" title="Permalink to this headline"></a></h3>
497<p>Using a text editor, create a form called upload_success.php. In it,
498place this code and save it to your <strong>application/views/</strong> directory:</p>
499<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o">&lt;</span><span class="nx">html</span><span class="o">&gt;</span>
500<span class="o">&lt;</span><span class="nx">head</span><span class="o">&gt;</span>
501<span class="o">&lt;</span><span class="nx">title</span><span class="o">&gt;</span><span class="nx">Upload</span> <span class="nx">Form</span><span class="o">&lt;/</span><span class="nx">title</span><span class="o">&gt;</span>
502<span class="o">&lt;/</span><span class="nx">head</span><span class="o">&gt;</span>
503<span class="o">&lt;</span><span class="nx">body</span><span class="o">&gt;</span>
504
505<span class="o">&lt;</span><span class="nx">h3</span><span class="o">&gt;</span><span class="nx">Your</span> <span class="nb">file</span> <span class="nx">was</span> <span class="nx">successfully</span> <span class="nx">uploaded</span><span class="o">!&lt;/</span><span class="nx">h3</span><span class="o">&gt;</span>
506
507<span class="o">&lt;</span><span class="nx">ul</span><span class="o">&gt;</span>
508<span class="o">&lt;?</span><span class="nx">php</span> <span class="k">foreach</span> <span class="p">(</span><span class="nv">$upload_data</span> <span class="k">as</span> <span class="nv">$item</span> <span class="o">=&gt;</span> <span class="nv">$value</span><span class="p">)</span><span class="o">:</span><span class="cp">?&gt;</span>
509<span class="p">&lt;</span><span class="nt">li</span><span class="p">&gt;</span><span class="cp">&lt;?php</span> <span class="k">echo</span> <span class="nv">$item</span><span class="p">;</span><span class="cp">?&gt;</span>: <span class="cp">&lt;?php</span> <span class="k">echo</span> <span class="nv">$value</span><span class="p">;</span><span class="cp">?&gt;</span><span class="p">&lt;/</span><span class="nt">li</span><span class="p">&gt;</span>
510<span class="cp">&lt;?php</span> <span class="k">endforeach</span><span class="p">;</span> <span class="cp">?&gt;</span>
511<span class="p">&lt;/</span><span class="nt">ul</span><span class="p">&gt;</span>
512
513<span class="p">&lt;</span><span class="nt">p</span><span class="p">&gt;</span><span class="cp">&lt;?php</span> <span class="k">echo</span> <span class="nx">anchor</span><span class="p">(</span><span class="s1">&#39;upload&#39;</span><span class="p">,</span> <span class="s1">&#39;Upload Another File!&#39;</span><span class="p">);</span> <span class="cp">?&gt;</span><span class="p">&lt;/</span><span class="nt">p</span><span class="p">&gt;</span>
514
515<span class="p">&lt;/</span><span class="nt">body</span><span class="p">&gt;</span>
516<span class="p">&lt;/</span><span class="nt">html</span><span class="p">&gt;</span>
517</pre></div>
518</div>
519</div>
520<div class="section" id="the-controller">
521<h3><a class="toc-backref" href="#id4">The Controller</a><a class="headerlink" href="#the-controller" title="Permalink to this headline"></a></h3>
522<p>Using a text editor, create a controller called Upload.php. In it, place
523this code and save it to your <strong>application/controllers/</strong> directory:</p>
524<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o">&lt;?</span><span class="nx">php</span>
525
526<span class="k">class</span> <span class="nc">Upload</span> <span class="k">extends</span> <span class="nx">CI_Controller</span> <span class="p">{</span>
527
528        <span class="k">public</span> <span class="k">function</span> <span class="nf">__construct</span><span class="p">()</span>
529        <span class="p">{</span>
530                <span class="k">parent</span><span class="o">::</span><span class="na">__construct</span><span class="p">();</span>
531                <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">helper</span><span class="p">(</span><span class="k">array</span><span class="p">(</span><span class="s1">&#39;form&#39;</span><span class="p">,</span> <span class="s1">&#39;url&#39;</span><span class="p">));</span>
532        <span class="p">}</span>
533
534        <span class="k">public</span> <span class="k">function</span> <span class="nf">index</span><span class="p">()</span>
535        <span class="p">{</span>
536                <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">view</span><span class="p">(</span><span class="s1">&#39;upload_form&#39;</span><span class="p">,</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;error&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39; &#39;</span> <span class="p">));</span>
537        <span class="p">}</span>
538
539        <span class="k">public</span> <span class="k">function</span> <span class="nf">do_upload</span><span class="p">()</span>
540        <span class="p">{</span>
541                <span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;upload_path&#39;</span><span class="p">]</span>          <span class="o">=</span> <span class="s1">&#39;./uploads/&#39;</span><span class="p">;</span>
542                <span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;allowed_types&#39;</span><span class="p">]</span>        <span class="o">=</span> <span class="s1">&#39;gif|jpg|png&#39;</span><span class="p">;</span>
543                <span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;max_size&#39;</span><span class="p">]</span>             <span class="o">=</span> <span class="mi">100</span><span class="p">;</span>
544                <span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;max_width&#39;</span><span class="p">]</span>            <span class="o">=</span> <span class="mi">1024</span><span class="p">;</span>
545                <span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;max_height&#39;</span><span class="p">]</span>           <span class="o">=</span> <span class="mi">768</span><span class="p">;</span>
546
547                <span class="nv">$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;upload&#39;</span><span class="p">,</span> <span class="nv">$config</span><span class="p">);</span>
548
549                <span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">upload</span><span class="o">-&gt;</span><span class="na">do_upload</span><span class="p">(</span><span class="s1">&#39;userfile&#39;</span><span class="p">))</span>
550                <span class="p">{</span>
551                        <span class="nv">$error</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;error&#39;</span> <span class="o">=&gt;</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">upload</span><span class="o">-&gt;</span><span class="na">display_errors</span><span class="p">());</span>
552
553                        <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">view</span><span class="p">(</span><span class="s1">&#39;upload_form&#39;</span><span class="p">,</span> <span class="nv">$error</span><span class="p">);</span>
554                <span class="p">}</span>
555                <span class="k">else</span>
556                <span class="p">{</span>
557                        <span class="nv">$data</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;upload_data&#39;</span> <span class="o">=&gt;</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">upload</span><span class="o">-&gt;</span><span class="na">data</span><span class="p">());</span>
558
559                        <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">view</span><span class="p">(</span><span class="s1">&#39;upload_success&#39;</span><span class="p">,</span> <span class="nv">$data</span><span class="p">);</span>
560                <span class="p">}</span>
561        <span class="p">}</span>
562<span class="p">}</span>
563<span class="cp">?&gt;</span>
564</pre></div>
565</div>
566</div>
567<div class="section" id="the-upload-directory">
568<h3><a class="toc-backref" href="#id5">The Upload Directory</a><a class="headerlink" href="#the-upload-directory" title="Permalink to this headline"></a></h3>
569<p>You’ll need a destination directory for your uploaded images. Create a
570directory at the root of your CodeIgniter installation called uploads
571and set its file permissions to 777.</p>
572</div>
573<div class="section" id="try-it">
574<h3><a class="toc-backref" href="#id6">Try it!</a><a class="headerlink" href="#try-it" title="Permalink to this headline"></a></h3>
575<p>To try your form, visit your site using a URL similar to this one:</p>
576<div class="highlight-ci"><div class="highlight"><pre><span></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">upload</span><span class="o">/</span>
577</pre></div>
578</div>
579<p>You should see an upload form. Try uploading an image file (either a
580jpg, gif, or png). If the path in your controller is correct it should
581work.</p>
582</div>
583</div>
584<div class="section" id="reference-guide">
585<h2><a class="toc-backref" href="#id7">Reference Guide</a><a class="headerlink" href="#reference-guide" title="Permalink to this headline"></a></h2>
586<div class="section" id="initializing-the-upload-class">
587<h3><a class="toc-backref" href="#id8">Initializing the Upload Class</a><a class="headerlink" href="#initializing-the-upload-class" title="Permalink to this headline"></a></h3>
588<p>Like most other classes in CodeIgniter, the Upload class is initialized
589in your controller using the <code class="docutils literal"><span class="pre">$this-&gt;load-&gt;library()</span></code> method:</p>
590<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$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;upload&#39;</span><span class="p">);</span>
591</pre></div>
592</div>
593<p>Once the Upload class is loaded, the object will be available using:
594$this-&gt;upload</p>
595</div>
596<div class="section" id="setting-preferences">
597<h3><a class="toc-backref" href="#id9">Setting Preferences</a><a class="headerlink" href="#setting-preferences" title="Permalink to this headline"></a></h3>
598<p>Similar to other libraries, you’ll control what is allowed to be upload
599based on your preferences. In the controller you built above you set the
600following preferences:</p>
601<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;upload_path&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;./uploads/&#39;</span><span class="p">;</span>
602<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;allowed_types&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;gif|jpg|png&#39;</span><span class="p">;</span>
603<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;max_size&#39;</span><span class="p">]</span>     <span class="o">=</span> <span class="s1">&#39;100&#39;</span><span class="p">;</span>
604<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;max_width&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;1024&#39;</span><span class="p">;</span>
605<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;max_height&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;768&#39;</span><span class="p">;</span>
606
607<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span clas

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