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diff --git a/user_guide/general/helpers.html b/user_guide/general/helpers.html deleted file mode 100644 index 14edb8192..000000000 --- a/user_guide/general/helpers.html +++ /dev/null @@ -1,629 +0,0 @@ - - -<!DOCTYPE html> -<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]--> -<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]--> -<head> - <meta charset="utf-8"> - <meta name="viewport" content="width=device-width, initial-scale=1.0"> - - <title>Helper Functions — CodeIgniter 3.1.7 documentation</title> - - - - - <link rel="shortcut icon" href="../_static/ci-icon.ico"/> - - - - <link href='https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic|Roboto+Slab:400,700|Inconsolata:400,700&subset=latin,cyrillic' rel='stylesheet' type='text/css'> - - - - - - - - - - <link rel="stylesheet" href="../_static/css/citheme.css" type="text/css" /> - - - - <link rel="index" title="Index" - href="../genindex.html"/> - <link rel="search" title="Search" 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Helper</a></li> -<li class="toctree-l2"><a class="reference internal" href="../helpers/url_helper.html">URL Helper</a></li> -<li class="toctree-l2"><a class="reference internal" href="../helpers/xml_helper.html">XML Helper</a></li> -</ul> -</li> -</ul> - - - - </div> - - </nav> - - <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"> - - - <nav class="wy-nav-top" role="navigation" aria-label="top navigation"> - <i data-toggle="wy-nav-top" class="fa fa-bars"></i> - <a href="../index.html">CodeIgniter</a> - </nav> - - - - <div class="wy-nav-content"> - <div class="rst-content"> - <div role="navigation" aria-label="breadcrumbs navigation"> - <ul class="wy-breadcrumbs"> - <li><a href="../index.html">Docs</a> »</li> - - <li><a href="index.html">General Topics</a> »</li> - - <li>Helper Functions</li> - <li class="wy-breadcrumbs-aside"> - - </li> - <div style="float:right;margin-left:5px;" id="closeMe"> - <img title="Classic Layout" alt="classic layout" src="data:image/gif;base64,R0lGODlhFAAUAJEAAAAAADMzM////wAAACH5BAUUAAIALAAAAAAUABQAAAImlI+py+0PU5gRBRDM3DxbWoXis42X13USOLauUIqnlsaH/eY6UwAAOw==" /> - </div> - </ul> - <hr/> -</div> - <div role="main" class="document"> - - <div class="section" id="helper-functions"> -<h1>Helper Functions<a class="headerlink" href="#helper-functions" title="Permalink to this headline">¶</a></h1> -<p>Helpers, as the name suggests, help you with tasks. Each helper file is -simply a collection of functions in a particular category. There are <strong>URL -Helpers</strong>, that assist in creating links, there are Form Helpers that help -you create form elements, <strong>Text Helpers</strong> perform various text formatting -routines, <strong>Cookie Helpers</strong> set and read cookies, File Helpers help you -deal with files, etc.</p> -<p>Unlike most other systems in CodeIgniter, Helpers are not written in an -Object Oriented format. They are simple, procedural functions. Each -helper function performs one specific task, with no dependence on other -functions.</p> -<p>CodeIgniter does not load Helper Files by default, so the first step in -using a Helper is to load it. Once loaded, it becomes globally available -in your <a class="reference internal" href="controllers.html"><span class="doc">controller</span></a> and -<a class="reference internal" href="views.html"><span class="doc">views</span></a>.</p> -<p>Helpers are typically stored in your <strong>system/helpers</strong>, or -<strong>application/helpers directory</strong>. CodeIgniter will look first in your -<strong>application/helpers directory</strong>. If the directory does not exist or the -specified helper is not located there CI will instead look in your -global <em>system/helpers/</em> directory.</p> -<div class="section" id="loading-a-helper"> -<h2>Loading a Helper<a class="headerlink" href="#loading-a-helper" title="Permalink to this headline">¶</a></h2> -<p>Loading a helper file is quite simple using the following method:</p> -<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">helper</span><span class="p">(</span><span class="s1">'name'</span><span class="p">);</span> -</pre></div> -</div> -<p>Where <strong>name</strong> is the file name of the helper, without the .php file -extension or the “helper” part.</p> -<p>For example, to load the <strong>URL Helper</strong> file, which is named -<strong>url_helper.php</strong>, you would do this:</p> -<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">helper</span><span class="p">(</span><span class="s1">'url'</span><span class="p">);</span> -</pre></div> -</div> -<p>A helper can be loaded anywhere within your controller methods (or -even within your View files, although that’s not a good practice), as -long as you load it before you use it. You can load your helpers in your -controller constructor so that they become available automatically in -any function, or you can load a helper in a specific function that needs -it.</p> -<div class="admonition note"> -<p class="first admonition-title">Note</p> -<p class="last">The Helper loading method above does not return a value, so -don’t try to assign it to a variable. Just use it as shown.</p> -</div> -</div> -<div class="section" id="loading-multiple-helpers"> -<h2>Loading Multiple Helpers<a class="headerlink" href="#loading-multiple-helpers" title="Permalink to this headline">¶</a></h2> -<p>If you need to load more than one helper you can specify them in an -array, like this:</p> -<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">helper</span><span class="p">(</span> - <span class="k">array</span><span class="p">(</span><span class="s1">'helper1'</span><span class="p">,</span> <span class="s1">'helper2'</span><span class="p">,</span> <span class="s1">'helper3'</span><span class="p">)</span> -<span class="p">);</span> -</pre></div> -</div> -</div> -<div class="section" id="auto-loading-helpers"> -<h2>Auto-loading Helpers<a class="headerlink" href="#auto-loading-helpers" title="Permalink to this headline">¶</a></h2> -<p>If you find that you need a particular helper globally throughout your -application, you can tell CodeIgniter to auto-load it during system -initialization. This is done by opening the <strong>application/config/autoload.php</strong> -file and adding the helper to the autoload array.</p> -</div> -<div class="section" id="using-a-helper"> -<h2>Using a Helper<a class="headerlink" href="#using-a-helper" title="Permalink to this headline">¶</a></h2> -<p>Once you’ve loaded the Helper File containing the function you intend to -use, you’ll call it the way you would a standard PHP function.</p> -<p>For example, to create a link using the <code class="docutils literal"><span class="pre">anchor()</span></code> function in one of -your view files you would do this:</p> -<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o"><?</span><span class="nx">php</span> <span class="k">echo</span> <span class="nx">anchor</span><span class="p">(</span><span class="s1">'blog/comments'</span><span class="p">,</span> <span class="s1">'Click Here'</span><span class="p">);</span><span class="cp">?></span> -</pre></div> -</div> -<p>Where “Click Here” is the name of the link, and “blog/comments” is the -URI to the controller/method you wish to link to.</p> -</div> -<div class="section" id="extending-helpers"> -<h2>“Extending” Helpers<a class="headerlink" href="#extending-helpers" title="Permalink to this headline">¶</a></h2> -<p>To “extend” Helpers, create a file in your <strong>application/helpers/</strong> folder -with an identical name to the existing Helper, but prefixed with <strong>MY_</strong> -(this item is configurable. See below.).</p> -<p>If all you need to do is add some functionality to an existing helper - -perhaps add a function or two, or change how a particular helper -function operates - then it’s overkill to replace the entire helper with -your version. In this case it’s better to simply “extend” the Helper.</p> -<div class="admonition note"> -<p class="first admonition-title">Note</p> -<p class="last">The term “extend” is used loosely since Helper functions are -procedural and discrete and cannot be extended in the traditional -programmatic sense. Under the hood, this gives you the ability to -add to or or to replace the functions a Helper provides.</p> -</div> -<p>For example, to extend the native <strong>Array Helper</strong> you’ll create a file -named <strong>application/helpers/MY_array_helper.php</strong>, and add or override -functions:</p> -<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// any_in_array() is not in the Array Helper, so it defines a new function</span> -<span class="k">function</span> <span class="nf">any_in_array</span><span class="p">(</span><span class="nv">$needle</span><span class="p">,</span> <span class="nv">$haystack</span><span class="p">)</span> -<span class="p">{</span> - <span class="nv">$needle</span> <span class="o">=</span> <span class="nb">is_array</span><span class="p">(</span><span class="nv">$needle</span><span class="p">)</span> <span class="o">?</span> <span class="nv">$needle</span> <span class="o">:</span> <span class="k">array</span><span class="p">(</span><span class="nv">$needle</span><span class="p">);</span> - - <span class="k">foreach</span> <span class="p">(</span><span class="nv">$needle</span> <span class="k">as</span> <span class="nv">$item</span><span class="p">)</span> - <span class="p">{</span> - <span class="k">if</span> <span class="p">(</span><span class="nb">in_array</span><span class="p">(</span><span class="nv">$item</span><span class="p">,</span> <span class="nv">$haystack</span><span class="p">))</span> - <span class="p">{</span> - <span class="k">return</span> <span class="k">TRUE</span><span class="p">;</span> - <span class="p">}</span> - <span class="p">}</span> - - <span class="k">return</span> <span class="k">FALSE</span><span class="p">;</span> -<span class="p">}</span> - -<span class="c1">// random_element() is included in Array Helper, so it overrides the native function</span> -<span class="k">function</span> <span class="nf">random_element</span><span class="p">(</span><span class="nv">$array</span><span class="p">)</span> -<span class="p">{</span> - <span class="nb">shuffle</span><span class="p">(</span><span class="nv">$array</span><span class="p">);</span> - <span class="k">return</span> <span class="nb">array_pop</span><span class="p">(</span><span class="nv">$array</span><span class="p">);</span> -<span class="p">}</span> -</pre></div> -</div> -<div class="section" id="setting-your-own-prefix"> -<h3>Setting Your Own Prefix<a class="headerlink" href="#setting-your-own-prefix" title="Permalink to this headline">¶</a></h3> -<p>The filename prefix for “extending” Helpers is the same used to extend -libraries and core classes. To set your own prefix, open your -<strong>application/config/config.php</strong> file and look for this item:</p> -<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'subclass_prefix'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'MY_'</span><span class="p">;</span> -</pre></div> -</div> -<p>Please note that all native CodeIgniter libraries are prefixed with <strong>CI_</strong> -so DO NOT use that as your prefix.</p> -</div> -</div> -<div class="section" id="now-what"> -<h2>Now What?<a class="headerlink" href="#now-what" title="Permalink to this headline">¶</a></h2> -<p>In the Table of Contents you’ll find a list of all the available Helper -Files. Browse each one to see what they do.</p> -</div> -</div> - - - </div> - <footer> - - <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> - - <a href="libraries.html" class="btn btn-neutral float-right" title="Using CodeIgniter Libraries">Next <span class="fa fa-arrow-circle-right"></span></a> - - - <a href="models.html" class="btn btn-neutral" title="Models"><span class="fa fa-arrow-circle-left"></span> Previous</a> - - </div> - - - <hr/> - - <div role="contentinfo"> - <p> - © Copyright 2014 - 2018, British Columbia Institute of Technology. - Last updated on Jan 13, 2018. - </p> - </div> - - Built with <a href="http://sphinx-doc.org/">Sphinx</a> using a <a href="https://github.com/snide/sphinx_rtd_theme">theme</a> provided by <a href="https://readthedocs.org">Read the Docs</a>. - -</footer> - </div> - </div> - - </section> - - </div> - - - - - - <script type="text/javascript"> - var DOCUMENTATION_OPTIONS = { - URL_ROOT:'../', - VERSION:'3.1.7', - COLLAPSE_INDEX:false, - FILE_SUFFIX:'.html', - HAS_SOURCE: false - }; - </script> - <script type="text/javascript" src="../_static/jquery.js"></script> - <script type="text/javascript" src="../_static/underscore.js"></script> - <script type="text/javascript" src="../_static/doctools.js"></script> - - - - - - <script type="text/javascript" src="../_static/js/theme.js"></script> - - - - - <script type="text/javascript"> - jQuery(function () { - SphinxRtdTheme.StickyNav.enable(); - }); - </script> - - -</body> -</html>
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