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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/Naked_Yoshi/sq_kanban
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350<li class="toctree-l2"><a class="reference internal" href="../database/helpers.html">Query Helper Functions</a></li>
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389          
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396
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425  <div class="section" id="form-helper">
426<h1>Form Helper<a class="headerlink" href="#form-helper" title="Permalink to this headline"></a></h1>
427<p>The Form Helper file contains functions that assist in working with
428forms.</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="#escaping-field-values" id="id2">Escaping field values</a></li>
433<li><a class="reference internal" href="#available-functions" id="id3">Available Functions</a></li>
434</ul>
435</div>
436<div class="custom-index container"></div><div class="section" id="loading-this-helper">
437<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>
438<p>This helper is loaded using the following code:</p>
439<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">helper</span><span class="p">(</span><span class="s1">&#39;form&#39;</span><span class="p">);</span>
440</pre></div>
441</div>
442</div>
443<div class="section" id="escaping-field-values">
444<h2><a class="toc-backref" href="#id2">Escaping field values</a><a class="headerlink" href="#escaping-field-values" title="Permalink to this headline"></a></h2>
445<p>You may need to use HTML and characters such as quotes within your form
446elements. In order to do that safely, you’ll need to use
447<a class="reference internal" href="../general/common_functions.html"><span class="doc">common function</span></a>
448<code class="xref py py-func docutils literal"><span class="pre">html_escape()</span></code>.</p>
449<p>Consider the following example:</p>
450<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$string</span> <span class="o">=</span> <span class="s1">&#39;Here is a string containing &quot;quoted&quot; text.&#39;</span><span class="p">;</span>
451
452<span class="o">&lt;</span><span class="nx">input</span> <span class="nx">type</span><span class="o">=</span><span class="s2">&quot;text&quot;</span> <span class="nx">name</span><span class="o">=</span><span class="s2">&quot;myfield&quot;</span> <span class="nx">value</span><span class="o">=</span><span class="s2">&quot;&lt;?php echo </span><span class="si">$string</span><span class="s2">; ?&gt;&quot;</span> <span class="o">/&gt;</span>
453</pre></div>
454</div>
455<p>Since the above string contains a set of quotes, it will cause the form
456to break. The <a class="reference internal" href="../general/common_functions.html#html_escape" title="html_escape"><code class="xref php php-func docutils literal"><span class="pre">html_escape()</span></code></a> function converts HTML special
457characters so that it can be used safely:</p>
458<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o">&lt;</span><span class="nx">input</span> <span class="nx">type</span><span class="o">=</span><span class="s2">&quot;text&quot;</span> <span class="nx">name</span><span class="o">=</span><span class="s2">&quot;myfield&quot;</span> <span class="nx">value</span><span class="o">=</span><span class="s2">&quot;&lt;?php echo html_escape(</span><span class="si">$string</span><span class="s2">); ?&gt;&quot;</span> <span class="o">/&gt;</span>
459</pre></div>
460</div>
461<div class="admonition note">
462<p class="first admonition-title">Note</p>
463<p class="last">If you use any of the form helper functions listed on this page,
464the form values will be automatically escaped, so there is no need
465to call this function. Use it only if you are creating your own
466form elements.</p>
467</div>
468</div>
469<div class="section" id="available-functions">
470<h2><a class="toc-backref" href="#id3">Available Functions</a><a class="headerlink" href="#available-functions" title="Permalink to this headline"></a></h2>
471<p>The following functions are available:</p>
472<dl class="function">
473<dt id="form_open">
474<code class="descname">form_open</code><span class="sig-paren">(</span><span class="optional">[</span><em>$action = ''</em><span class="optional">[</span>, <em>$attributes = ''</em><span class="optional">[</span>, <em>$hidden = array()</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#form_open" title="Permalink to this definition"></a></dt>
475<dd><table class="docutils field-list" frame="void" rules="none">
476<col class="field-name" />
477<col class="field-body" />
478<tbody valign="top">
479<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
480<li><strong>$action</strong> (<em>string</em>) – Form action/target URI string</li>
481<li><strong>$attributes</strong> (<em>array</em>) – HTML attributes</li>
482<li><strong>$hidden</strong> (<em>array</em>) – An array of hidden fields’ definitions</li>
483</ul>
484</td>
485</tr>
486<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">An HTML form opening tag</p>
487</td>
488</tr>
489<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
490</td>
491</tr>
492</tbody>
493</table>
494<p>Creates an opening form tag with a base URL <strong>built from your config preferences</strong>.
495It will optionally let you add form attributes and hidden input fields, and
496will always add the <cite>accept-charset</cite> attribute based on the charset value in your
497config file.</p>
498<p>The main benefit of using this tag rather than hard coding your own HTML is that
499it permits your site to be more portable in the event your URLs ever change.</p>
500<p>Here’s a simple example:</p>
501<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nx">form_open</span><span class="p">(</span><span class="s1">&#39;email/send&#39;</span><span class="p">);</span>
502</pre></div>
503</div>
504<p>The above example would create a form that points to your base URL plus the
505“email/send” URI segments, like this:</p>
506<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o">&lt;</span><span class="nx">form</span> <span class="nx">method</span><span class="o">=</span><span class="s2">&quot;post&quot;</span> <span class="nx">accept</span><span class="o">-</span><span class="nx">charset</span><span class="o">=</span><span class="s2">&quot;utf-8&quot;</span> <span class="nx">action</span><span class="o">=</span><span class="s2">&quot;http://example.com/index.php/email/send&quot;</span><span class="o">&gt;</span>
507</pre></div>
508</div>
509<p><strong>Adding Attributes</strong></p>
510<blockquote>
511<div><p>Attributes can be added by passing an associative array to the second
512parameter, like this:</p>
513<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$attributes</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;class&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;email&#39;</span><span class="p">,</span> <span class="s1">&#39;id&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;myform&#39;</span><span class="p">);</span>
514<span class="k">echo</span> <span class="nx">form_open</span><span class="p">(</span><span class="s1">&#39;email/send&#39;</span><span class="p">,</span> <span class="nv">$attributes</span><span class="p">);</span>
515</pre></div>
516</div>
517<p>Alternatively, you can specify the second parameter as a string:</p>
518<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nx">form_open</span><span class="p">(</span><span class="s1">&#39;email/send&#39;</span><span class="p">,</span> <span class="s1">&#39;class=&quot;email&quot; id=&quot;myform&quot;&#39;</span><span class="p">);</span>
519</pre></div>
520</div>
521<p>The above examples would create a form similar to this:</p>
522<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o">&lt;</span><span class="nx">form</span> <span class="nx">method</span><span class="o">=</span><span class="s2">&quot;post&quot;</span> <span class="nx">accept</span><span class="o">-</span><span class="nx">charset</span><span class="o">=</span><span class="s2">&quot;utf-8&quot;</span> <span class="nx">action</span><span class="o">=</span><span class="s2">&quot;http://example.com/index.php/email/send&quot;</span> <span class="nx">class</span><span class="o">=</span><span class="s2">&quot;email&quot;</span> <span class="nx">id</span><span class="o">=</span><span class="s2">&quot;myform&quot;</span><span class="o">&gt;</span>
523</pre></div>
524</div>
525</div></blockquote>
526<p><strong>Adding Hidden Input Fields</strong></p>
527<blockquote>
528<div><p>Hidden fields can be added by passing an associative array to the
529third parameter, like this:</p>
530<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$hidden</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;username&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;Joe&#39;</span><span class="p">,</span> <span class="s1">&#39;member_id&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;234&#39;</span><span class="p">);</span>
531<span class="k">echo</span> <span class="nx">form_open</span><span class="p">(</span><span class="s1">&#39;email/send&#39;</span><span class="p">,</span> <span class="s1">&#39;&#39;</span><span class="p">,</span> <span class="nv">$hidden</span><span class="p">);</span>
532</pre></div>
533</div>
534<p>You can skip the second parameter by passing any falsy value to it.</p>
535<p>The above example would create a form similar to this:</p>
536<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o">&lt;</span><span class="nx">form</span> <span class="nx">method</span><span class="o">=</span><span class="s2">&quot;post&quot;</span> <span class="nx">accept</span><span class="o">-</span><span class="nx">charset</span><span class="o">=</span><span class="s2">&quot;utf-8&quot;</span> <span class="nx">action</span><span class="o">=</span><span class="s2">&quot;http://example.com/index.php/email/send&quot;</span><span class="o">&gt;</span>
537        <span class="o">&lt;</span><span class="nx">input</span> <span class="nx">type</span><span class="o">=</span><span class="s2">&quot;hidden&quot;</span> <span class="nx">name</span><span class="o">=</span><span class="s2">&quot;username&quot;</span> <span class="nx">value</span><span class="o">=</span><span class="s2">&quot;Joe&quot;</span> <span class="o">/&gt;</span>
538        <span class="o">&lt;</span><span class="nx">input</span> <span class="nx">type</span><span class="o">=</span><span class="s2">&quot;hidden&quot;</span> <span class="nx">name</span><span class="o">=</span><span class="s2">&quot;member_id&quot;</span> <span class="nx">value</span><span class="o">=</span><span class="s2">&quot;234&quot;</span> <span class="o">/&gt;</span>
539</pre></div>
540</div>
541</div></blockquote>
542</dd></dl>
543
544<dl class="function">
545<dt id="form_open_multipart">
546<code class="descname">form_open_multipart</code><span class="sig-paren">(</span><span class="optional">[</span><em>$action = ''</em><span class="optional">[</span>, <em>$attributes = array()</em><span class="optional">[</span>, <em>$hidden = array()</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#form_open_multipart" title="Permalink to this definition"></a></dt>
547<dd><table class="docutils field-list" frame="void" rules="none">
548<col class="field-name" />
549<col class="field-body" />
550<tbody valign="top">
551<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
552<li><strong>$action</strong> (<em>string</em>) – Form action/target URI string</li>
553<li><strong>$attributes</strong> (<em>array</em>) – HTML attributes</li>
554<li><strong>$hidden</strong> (<em>array</em>) – An array of hidden fields’ definitions</li>
555</ul>
556</td>
557</tr>
558<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">An HTML multipart form opening tag</p>
559</td>
560</tr>
561<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
562</td>
563</tr>
564</tbody>
565</table>
566<p>This function is absolutely identical to <a class="reference internal" href="#form_open" title="form_open"><code class="xref php php-func docutils literal"><span class="pre">form_open()</span></code></a> above,
567except that it adds a <em>multipart</em> attribute, which is necessary if you
568would like to use the form to upload files with.</p>
569</dd></dl>
570
571<dl class="function">
572<dt id="form_hidden">
573<code class="descname">form_hidden</code><span class="sig-paren">(</span><em>$name</em><span class="optional">[</span>, <em>$value = ''</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#form_hidden" title="Permalink to this definition"></a></dt>
574<dd><table class="docutils field-list" frame="void" rules="none">
575<col class="field-name" />
576<col class="field-body" />
577<tbody valign="top">
578<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
579<li><strong>$name</strong> (<em>string</em>) – Field name</li>
580<li><strong>$value</strong> (<em>string</em>) – Field value</li>
581</ul>
582</td>
583</tr>
584<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">An HTML hidden input field tag</p>
585</td>
586</tr>
587<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
588</td>
589</tr>
590</tbody>
591</table>
592<p>Lets you generate hidden input fields. You can either submit a
593name/value string to create one field:</p>
594<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">form_hidden</span><span class="p">(</span><span class="s1">&#39;username&#39;</span><span class="p">,</span> <span class="s1">&#39;johndoe&#39;</span><span class="p">);</span>
595<span class="c1">// Would produce: &lt;input type=&quot;hidden&quot; name=&quot;username&quot; value=&quot;johndoe&quot; /&gt;</span>
596</pre></div>
597</div>
598<p>… or you can submit an associative array to create multiple fields:</p>
599<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$data</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
600        <span class="s1">&#39;name&#39;</span>  <span class="o">=&gt;</span> <span class="s1">&#39;John Doe&#39;</span><span class="p">,</span>
601        <span class="s1">&#39;email&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;john@example.com&#39;</span><span class="p">,</span>
602        <span class="s1">&#39;url&#39;</span>   <span class="o">=&gt;</span> <span class="s1">&#39;http://example.com&#39;</span>
603<span class="p">);</span>
604
605<span class="k">echo</span> <span class="nx">form_hidden</span><span class="p">(</span><span class="nv">$data</span><span class="p">);</span>
606
607<span class="cm">/*</span>
608<span class="cm">        Would produce:</span>
609<span class="cm">        &lt;input type=&quot;hidden&quot; name=&quot;name&quot; value=&quot;John Doe&quot; /&gt;</span>
610<span class="cm">        &lt;input type=&quot;hidden&quot; name=&quot;email&quot; value=&quot;john@example.com&quot; /&gt;</span>
611<span class="cm">        &lt;input type=&quot;hidden&quot; name=&quot;url&quot; value=&quot;http://example.com&quot; /&gt;</span>
612<span class="cm">*/</span>
613</pre></div>
614</div>
615<p>You can also pass an associative array to the value field:</p>
616<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$data</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
617        <span class="s1">&#39;name&#39;</span>  <span class="o">=&gt;</span> <span class="s1">&#39;John Doe&#39;</span><span class="p">,</span>
618        <span class="s1">&#39;email&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;john@example.com&#39;</span><span class="p">,</span>
619        <span class="s1">&#39;url&#39;</span>   <span class="o">=&gt;</span> <span class="s1">&#39;http://example.com&#39;</span>
620<span class="p">);</span>
621
622<span class="k">echo</span> <span class="nx">form_hidden</span><span class="p">(</span><span class="s1">&#39;my_array&#39;</span><span class="p">,</span> <span class="nv">$data</span><span class="p">);</span>
623
624<span class="cm">/*</span>
625<span class="cm">        Would produce:</span>
626
627<span class="cm">        &lt;input type=&quot;hidden&quot; name=&quot;my_array[name]&quot; value=&quot;John Doe&quot; /&gt;</span>
628<span class="cm">        &lt;input type=&quot;hidden&quot; name=&quot;my_array[email]&quot; value=&quot;john@example.com&quot; /&gt;</span>
629<span class="cm">        &lt;input type=&quot;hidden&quot; name=&quot;my_array[url]&quot; value=&quot;http://example.com&quot; /&gt;</span>
630<span class="cm">*/</span>
631</pre></div>
632</div>
633<p>If you want to create hidden input fields with extra attributes:</p>
634<div class="highlight-ci"><div class="highlight"><pre>

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