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Derek Jonesfd93d222008-05-06 15:18:50 +0000[diff] [blame]6<title>Loader Class : CodeIgniter User Guide</title>
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Derek Jones6b7b11f2008-05-06 16:07:27 +0000[diff] [blame]31<td><h1>CodeIgniter User Guide Version 1.6.2</h1></td>
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45Loader Class
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57
58
59<h1>Loader Class</h1>
60
admine334c472006-10-21 19:44:22 +0000[diff] [blame]61<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>,
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]62<a href="../general/helpers.html">Helpers</a>, <a href="../general/plugins.html">Plugins</a>, or your own files.</p>
63
64<p class="important"><strong>Note:</strong> This class is initialized automatically by the system so there is no need to do it manually.</p>
65
66<p>The following functions are available in this class:</p>
67
68
69
admin2f0bac82006-10-09 17:36:45 +0000[diff] [blame]70<h2>$this->load->library('<var>class_name</var>')</h2>
71
admine334c472006-10-21 19:44:22 +0000[diff] [blame]72<p>This function is used to load core classes. Where <var>class_name</var> is the name of the class you want to load.
admin2f0bac82006-10-09 17:36:45 +0000[diff] [blame]73Note: We use the terms "class" and "library" interchangeably.</p>
74
Derek Allardd2df9bc2007-04-15 17:41:17 +0000[diff] [blame]75<p>For example, if you would like to send email with CodeIgniter, the first step is to load the email class within your controller:</p>
admin2f0bac82006-10-09 17:36:45 +0000[diff] [blame]76
77<code>$this->load->library('email');</code>
78
79<p>Once loaded, the library will be ready for use, using <kbd>$this->email-></kbd><samp><em>some_function</em>()</samp>.
80
admine7e1dcd2006-10-21 18:04:01 +0000[diff] [blame]81Each library is described in detail in its own page, so please read the information regarding each one you would like to use.</p>
admin2f0bac82006-10-09 17:36:45 +0000[diff] [blame]82
Derek Allardc6441282007-07-04 23:54:32 +0000[diff] [blame]83<p>Parameters can be passed to the library via an array in the second parameter.</p>
admincf493902006-10-10 07:12:31 +0000[diff] [blame]84
85
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]86<h2>$this->load->view('<var>file_name</var>', <samp>$data</samp>, <kbd>true/false</kbd>)</h2>
87
88<p>This function is used to load your View files. If you haven't read the <a href="../general/views.html">Views</a> section of the
89user guide it is recommended that you do since it shows you how this function is typically used.</p>
90
admin1b90c272006-10-31 18:22:29 +0000[diff] [blame]91<p>The first parameter is required. It is the name of the view file you would like to load. &nbsp;Note: The .php file extension does not need to be specified unless you use something other then <kbd>.php</kbd>.</p>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]92
93<p>The second <strong>optional</strong> parameter can take
admine334c472006-10-21 19:44:22 +0000[diff] [blame]94an associative array or an object as input, which it runs through the PHP <a href="http://www.php.net/extract">extract</a> function to
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]95convert to variables that can be used in your view files. Again, read the <a href="../general/views.html">Views</a> page to learn
96how this might be useful.</p>
97
98<p>The third <strong>optional</strong> parameter lets you change the behavior of the function so that it returns data as a string
99rather than sending it to your browser. This can be useful if you want to process the data in some way. If you
100set the parameter to <kbd>true</kbd> (boolean) it will return data. The default behavior is <kbd>false</kbd>, which sends it
Derek Allardd8b92a32007-03-28 01:26:32 +0000[diff] [blame]101to your browser. Remember to assign it to a variable if you want the data returned:</p>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]102
103<code>$string = $this->load->view('<var>myfile</var>', '', <kbd>true</kbd>);</code>
104
105
Derek Allardc8b21742008-05-18 03:57:40 +0000[diff] [blame]106<h2>$this-&gt;load-&gt;model('<var>Model_name</var>');</h2>
107<p><code>$this-&gt;load-&gt;model('<var>Model_name</var>');</code></p>
Derek Allard6d504e12008-05-26 02:34:43 +0000[diff] [blame]108<p>If your model is located in a sub-folder, include the relative path from your models folder. For example, if you have a model located at application/models/blog/queries.php you'll load it using:</p>
Derek Allardc8b21742008-05-18 03:57:40 +0000[diff] [blame]109<p><code>$this-&gt;load-&gt;model('<var>blog/queries</var>');</code></p>
110<p>If you would like your model assigned to a different object name you can specify it via the second parameter of the loading
111 function:</p>
112<code> $this-&gt;load-&gt;model('<var>Model_name</var>', '<kbd>fubar</kbd>');<br />
113<br />
114$this-&gt;<kbd>fubar</kbd>-&gt;function();</code>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]115<h2>$this->load->database('<var>options</var>', <kbd>true/false</kbd>)</h2>
admine334c472006-10-21 19:44:22 +0000[diff] [blame]116<p>This function lets you load the database class. The two parameters are <strong>optional</strong>. Please see the
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]117<a href="./database/index.html">database</a> section for more info.</p>
118
119
120<h2>$this->load->scaffolding('<var>table_name</var>')</h2>
121
admine334c472006-10-21 19:44:22 +0000[diff] [blame]122<p>This function lets you enable scaffolding. Please see the
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]123<a href="../general/scaffolding.html">scaffolding</a> section for more info.</p>
124
125
126
127<h2>$this->load->vars(<samp>$array</samp>)</h2>
128
129<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.
admine334c472006-10-21 19:44:22 +0000[diff] [blame]130This function produces the same result as using the second parameter of the <dfn>$this->load->view()</dfn> function above. The reason you might
131want to use this function independently is if you would like to set some global variables in the constructor of your controller
132and have them become available in any view file loaded from any function. You can have multiple calls to this function. The data get cached
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]133and merged into one array for conversion to variables.
134</p>
135
136
137<h2>$this->load->helper('<var>file_name</var>')</h2>
138<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>
139
140
141<h2>$this->load->plugin('<var>file_name</var>')</h2>
142<p>This function loads plugins files, where <var>file_name</var> is the name of the file, without the <kbd>_plugin.php</kbd> extension.</p>
143
144<h2>$this->load->file('<var>filepath/filename</var>', <kbd>true/false</kbd>)</h2>
admine334c472006-10-21 19:44:22 +0000[diff] [blame]145<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.
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]146By 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)
147it will instead return the data as a string.</p>
148
149
Derek Jonesfd93d222008-05-06 15:18:50 +0000[diff] [blame]150<h2>$this->load->lang('<var>file_name</var>')</h2>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]151<p>This function is an alias of the <a href="language.html">language loading function</a>: $this->lang->load()</p>
152
153<h2>$this->load->config('<var>file_name</var>')</h2>
154<p>This function is an alias of the <a href="config.html">config file loading function</a>: $this->config->load()</p>
155
156
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