170 lines
6.5 KiB
HTML
170 lines
6.5 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
|
|
<head>
|
|
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
|
<title>Array Helper : CodeIgniter User Guide</title>
|
|
|
|
<style type='text/css' media='all'>@import url('../userguide.css');</style>
|
|
<link rel='stylesheet' type='text/css' media='all' href='../userguide.css' />
|
|
|
|
<script type="text/javascript" src="../nav/nav.js"></script>
|
|
<script type="text/javascript" src="../nav/prototype.lite.js"></script>
|
|
<script type="text/javascript" src="../nav/moo.fx.js"></script>
|
|
<script type="text/javascript" src="../nav/user_guide_menu.js"></script>
|
|
|
|
<meta http-equiv='expires' content='-1' />
|
|
<meta http-equiv= 'pragma' content='no-cache' />
|
|
<meta name='robots' content='all' />
|
|
<meta name='author' content='ExpressionEngine Dev Team' />
|
|
<meta name='description' content='CodeIgniter User Guide' />
|
|
|
|
</head>
|
|
<body>
|
|
|
|
<!-- START NAVIGATION -->
|
|
<div id="nav"><div id="nav_inner"><script type="text/javascript">create_menu('../');</script></div></div>
|
|
<div id="nav2"><a name="top"></a><a href="javascript:void(0);" onclick="myHeight.toggle();"><img src="../images/nav_toggle_darker.jpg" width="154" height="43" border="0" title="Toggle Table of Contents" alt="Toggle Table of Contents" /></a></div>
|
|
<div id="masthead">
|
|
<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
|
|
<tr>
|
|
<td><h1>CodeIgniter User Guide Version 2.1.3</h1></td>
|
|
<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td>
|
|
</tr>
|
|
</table>
|
|
</div>
|
|
<!-- END NAVIGATION -->
|
|
|
|
|
|
<!-- START BREADCRUMB -->
|
|
<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
|
|
<tr>
|
|
<td id="breadcrumb">
|
|
<a href="http://codeigniter.com/">CodeIgniter Home</a> ›
|
|
<a href="../index.html">User Guide Home</a> ›
|
|
Array Helper
|
|
</td>
|
|
<td id="searchbox"><form method="get" action="http://www.google.com/search"><input type="hidden" name="as_sitesearch" id="as_sitesearch" value="codeigniter.com/user_guide/" />Search User Guide <input type="text" class="input" style="width:200px;" name="q" id="q" size="31" maxlength="255" value="" /> <input type="submit" class="submit" name="sa" value="Go" /></form></td>
|
|
</tr>
|
|
</table>
|
|
<!-- END BREADCRUMB -->
|
|
|
|
<br clear="all" />
|
|
|
|
|
|
<!-- 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 />
|
|
"I find that the harder I work, the more luck I seem to have. - Thomas Jefferson",<br />
|
|
"Don't stay in bed, unless you can make money in bed. - George Burns",<br />
|
|
"We didn't lose the game; we just ran out of time. - Vince Lombardi",<br />
|
|
"If everything seems under control, you're not going fast enough. - Mario Andretti",<br />
|
|
"Reality is merely an illusion, albeit a very persistent one. - Albert Einstein",<br />
|
|
"Chance favors the prepared mind - Louis Pasteur"<br />
|
|
);<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 />
|
|
'color' => 'red',<br />
|
|
'shape' => 'round',<br />
|
|
'radius' => '10',<br />
|
|
'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 />
|
|
'color' => 'red',<br />
|
|
'shape' => 'round',<br />
|
|
'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'), $array, NULL);<br />
|
|
</code>
|
|
|
|
<p>The above will return the following array:</p>
|
|
|
|
<code>
|
|
array(<br />
|
|
'color' => 'red',<br />
|
|
'shape' => 'round',<br />
|
|
'height' => NULL<br />
|
|
);
|
|
</code>
|
|
|
|
<p>This is useful when sending the <kbd>$_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 -->
|
|
|
|
|
|
<div id="footer">
|
|
<p>
|
|
Previous Topic: <a href="../libraries/javascript.html">Javascript Class</a> ·
|
|
<a href="#top">Top of Page</a> ·
|
|
<a href="../index.html">User Guide Home</a> ·
|
|
Next Topic: <a href="captcha_helper.html">CAPTCHA Helper</a></p>
|
|
<p><a href="http://codeigniter.com">CodeIgniter</a> · Copyright © 2006 - 2012 · <a href="http://ellislab.com/">EllisLab, Inc.</a></p>
|
|
</div>
|
|
|
|
</body>
|
|
</html> |