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authorDerek Jones <derek.jones@ellislab.com>2011-10-05 20:34:52 +0200
committerDerek Jones <derek.jones@ellislab.com>2011-10-05 20:34:52 +0200
commit8ede1a2ecbb62577afd32996956c5feaf7ddf9b6 (patch)
tree2e960ec3b416b477f40bb546371f2d486f4a22f0 /user_guide/helpers/array_helper.html
parentd1ecd5cd4ae6ab5d37df9fbda14b93977b9e743c (diff)
replacing the old HTML user guide with a Sphinx-managed user guide
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-<title>Array Helper : CodeIgniter User Guide</title>
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-<a href="http://codeigniter.com/">CodeIgniter Home</a> &nbsp;&#8250;&nbsp;
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-Array Helper
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-<!-- START CONTENT -->
-<div id="content">
-
-
-<h1>Array Helper</h1>
-
-<p>The Array Helper file contains functions that assist in working with arrays.</p>
-
-
-<h2>Loading this Helper</h2>
-
-<p>This helper is loaded using the following code:</p>
-<code>$this->load->helper('array');</code>
-
-<p>The following functions are available:</p>
-
-<h2>element()</h2>
-
-<p>Lets you fetch an item from an array. The function tests whether the array index is set and whether it has a value. If
-a value exists it is returned. If a value does not exist it returns FALSE, or whatever you've specified as the default value via the third parameter. Example:</p>
-
-<code>
-$array = array('color' => 'red', 'shape' => 'round', 'size' => '');<br />
-<br />
-// returns "red"<br />
-echo element('color', $array);<br />
-<br />
-// returns NULL<br />
-echo element('size', $array, NULL);
-</code>
-
-
-<h2>random_element()</h2>
-
-<p>Takes an array as input and returns a random element from it. Usage example:</p>
-
-<code>$quotes = array(<br />
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"I find that the harder I work, the more luck I seem to have. - Thomas Jefferson",<br />
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"Don't stay in bed, unless you can make money in bed. - George Burns",<br />
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"We didn't lose the game; we just ran out of time. - Vince Lombardi",<br />
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"If everything seems under control, you're not going fast enough. - Mario Andretti",<br />
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"Reality is merely an illusion, albeit a very persistent one. - Albert Einstein",<br />
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"Chance favors the prepared mind - Louis Pasteur"<br />
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;);<br />
-<br />
-echo random_element($quotes);</code>
-
-
-<h2>elements()</h2>
-
-<p>Lets you fetch a number of items from an array. The function tests whether each of the array indices is set. If an index does not exist
-it is set to FALSE, or whatever you've specified as the default value via the third parameter. Example:</p>
-
-<code>
-$array = array(<br />
-&nbsp;&nbsp;&nbsp;&nbsp;'color' => 'red',<br />
-&nbsp;&nbsp;&nbsp;&nbsp;'shape' => 'round',<br />
-&nbsp;&nbsp;&nbsp;&nbsp;'radius' => '10',<br />
-&nbsp;&nbsp;&nbsp;&nbsp;'diameter' => '20'<br />
-);<br />
-<br />
-$my_shape = elements(array('color', 'shape', 'height'), $array);<br />
-</code>
-
-<p>The above will return the following array:</p>
-
-<code>
-array(<br />
-&nbsp;&nbsp;&nbsp;&nbsp;'color' => 'red',<br />
-&nbsp;&nbsp;&nbsp;&nbsp;'shape' => 'round',<br />
-&nbsp;&nbsp;&nbsp;&nbsp;'height' => FALSE<br />
-);
-</code>
-
-<p>You can set the third parameter to any default value you like:</p>
-
-<code>
-$my_shape = elements(array('color', 'shape', 'height'), $array, NULL);<br />
-</code>
-
-<p>The above will return the following array:</p>
-
-<code>
-array(<br />
-&nbsp;&nbsp;&nbsp;&nbsp;'color' => 'red',<br />
-&nbsp;&nbsp;&nbsp;&nbsp;'shape' => 'round',<br />
-&nbsp;&nbsp;&nbsp;&nbsp;'height' => NULL<br />
-);
-</code>
-
-<p>This is useful when sending the <kbd>$_POST</kbd> array to one of your Models. This prevents users from
-sending additional POST data to be entered into your tables:</p>
-
-<code>
-$this->load->model('post_model');<br />
-<br />
-$this->post_model->update(elements(array('id', 'title', 'content'), $_POST));
-</code>
-
-<p>This ensures that only the id, title and content fields are sent to be updated.</p>
-
-</div>
-<!-- END CONTENT -->
-
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-<div id="footer">
-<p>
-Previous Topic:&nbsp;&nbsp; <a href="../libraries/javascript.html">Javascript Class</a>&nbsp;&nbsp;&nbsp;&middot;&nbsp;&nbsp;
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