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| <td><h1>Code Igniter User Guide Version 1.5.0b3</h1></td> | |
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| Loader Class | |
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| <h1>Loader Class</h1> | |
| <p>Loader, as the name suggests, is used to load elements. These elements can be libraries (classes) <a href="../general/views.html">View files</a>, | |
| <a href="../general/helpers.html">Helpers</a>, <a href="../general/plugins.html">Plugins</a>, or your own files.</p> | |
| <p class="important"><strong>Note:</strong> This class is initialized automatically by the system so there is no need to do it manually.</p> | |
| <p>The following functions are available in this class:</p> | |
| <h2>$this->load->library('<var>class_name</var>')</h2> | |
| <p>This function is used to load core classes. Where <var>class_name</var> is the name of the class you want to load. | |
| Note: We use the terms "class" and "library" interchangeably.</p> | |
| <p>For example, if you would like to send email with Code Igniter, the first step is to load the email class within your controller:</p> | |
| <code>$this->load->library('email');</code> | |
| <p>Once loaded, the library will be ready for use, using <kbd>$this->email-></kbd><samp><em>some_function</em>()</samp>. | |
| Each library is described in detail in its own page, so please read the information regarding each one you would like to use.</p> | |
| <p>Parameters can be passed to the library via an array in the second parameter. | |
| <p>If you would like your libraries assigned to a different variable name then the default you can specify the name in the second parameter:</p> | |
| <code> | |
| $this->load->library('email', 'E'); // Assigns the email object to "E"<br /> | |
| <br /> | |
| <kbd>$this->E-></kbd><samp><em>some_function</em>()</samp> | |
| </code> | |
| <h2>$this->load->view('<var>file_name</var>', <samp>$data</samp>, <kbd>true/false</kbd>)</h2> | |
| <p>This function is used to load your View files. If you haven't read the <a href="../general/views.html">Views</a> section of the | |
| user guide it is recommended that you do since it shows you how this function is typically used.</p> | |
| <p>The first parameter is required. It is the name of the view file you would like to load.</p> | |
| <p>The second <strong>optional</strong> parameter can take | |
| an associative array or an object as input, which it runs through the PHP <a href="http://www.php.net/extract">extract</a> function to | |
| convert to variables that can be used in your view files. Again, read the <a href="../general/views.html">Views</a> page to learn | |
| how this might be useful.</p> | |
| <p>The third <strong>optional</strong> parameter lets you change the behavior of the function so that it returns data as a string | |
| rather than sending it to your browser. This can be useful if you want to process the data in some way. If you | |
| set the parameter to <kbd>true</kbd> (boolean) it will return data. The default behavior is <kbd>false</kbd>, which sends it | |
| to your browser. Remember to assign it to a variable if you wan the data returned:</p> | |
| <code>$string = $this->load->view('<var>myfile</var>', '', <kbd>true</kbd>);</code> | |
| <h2>$this->load->database('<var>options</var>', <kbd>true/false</kbd>)</h2> | |
| <p>This function lets you load the database class. The two parameters are <strong>optional</strong>. Please see the | |
| <a href="./database/index.html">database</a> section for more info.</p> | |
| <h2>$this->load->scaffolding('<var>table_name</var>')</h2> | |
| <p>This function lets you enable scaffolding. Please see the | |
| <a href="../general/scaffolding.html">scaffolding</a> section for more info.</p> | |
| <h2>$this->load->vars(<samp>$array</samp>)</h2> | |
| <p>This function takes an associative array as input and generates variables using the PHP <a href="http://www.php.net/extract">extract</a> function. | |
| This function produces the same result as using the second parameter of the <dfn>$this->load->view()</dfn> function above. The reason you might | |
| want to use this function independently is if you would like to set some global variables in the constructor of your controller | |
| and have them become available in any view file loaded from any function. You can have multiple calls to this function. The data get cached | |
| and merged into one array for conversion to variables. | |
| </p> | |
| <h2>$this->load->helper('<var>file_name</var>')</h2> | |
| <p>This function loads helper files, where <var>file_name</var> is the name of the file, without the <kbd>_helper.php</kbd> extension.</p> | |
| <h2>$this->load->plugin('<var>file_name</var>')</h2> | |
| <p>This function loads plugins files, where <var>file_name</var> is the name of the file, without the <kbd>_plugin.php</kbd> extension.</p> | |
| <h2>$this->load->file('<var>filepath/filename</var>', <kbd>true/false</kbd>)</h2> | |
| <p>This is a generic file loading function. Supply the filepath and name in the first parameter and it will open and read the file. | |
| By default the data is sent to your browser, just like a View file, but if you set the second parameter to <kbd>true</kbd> (boolean) | |
| it will instead return the data as a string.</p> | |
| <h2>$this->load->lang('<var>file_name</var>')</h2> | |
| <p>This function is an alias of the <a href="language.html">language loading function</a>: $this->lang->load()</p> | |
| <h2>$this->load->config('<var>file_name</var>')</h2> | |
| <p>This function is an alias of the <a href="config.html">config file loading function</a>: $this->config->load()</p> | |
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