You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
170 lines
6.5 KiB
170 lines
6.5 KiB
<!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> |