system/helpers/array_helper.php

<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.2.4 or newer
 *
 * NOTICE OF LICENSE
 *
 * Licensed under the Open Software License version 3.0
 *
 * This source file is subject to the Open Software License (OSL 3.0) that is
 * bundled with this package in the files license.txt / license.rst.  It is
 * also available through the world wide web at this URL:
 * http://opensource.org/licenses/OSL-3.0
 * If you did not receive a copy of the license and are unable to obtain it
 * through the world wide web, please send an email to
 * licensing@ellislab.com so we can send you a copy immediately.
 *
 * @package		CodeIgniter
 * @author		EllisLab Dev Team
 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (http://ellislab.com/)
 * @license		http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * CodeIgniter Array Helpers
 *
 * @package		CodeIgniter
 * @subpackage	Helpers
 * @category	Helpers
 * @author		EllisLab Dev Team
 * @link		http://codeigniter.com/user_guide/helpers/array_helper.html
 */

// ------------------------------------------------------------------------

if ( ! function_exists('element'))
{
	/**
	 * Element
	 *
	 * Lets you determine whether an array index is set and whether it has a value.
	 * If the element is empty it returns NULL (or whatever you specify as the default value.)
	 *
	 * @param	string
	 * @param	array
	 * @param	mixed
	 * @return	mixed	depends on what the array contains
	 */
	function element($item, $array, $default = NULL)
	{
		return array_key_exists($item, $array) ? $array[$item] : $default;
	}
}

// ------------------------------------------------------------------------

if ( ! function_exists('random_element'))
{
	/**
	 * Random Element - Takes an array as input and returns a random element
	 *
	 * @param	array
	 * @return	mixed	depends on what the array contains
	 */
	function random_element($array)
	{
		return is_array($array) ? $array[array_rand($array)] : $array;
	}
}

// --------------------------------------------------------------------

if ( ! function_exists('elements'))
{
	/**
	 * Elements
	 *
	 * Returns only the array items specified. Will return a default value if
	 * it is not set.
	 *
	 * @param	array
	 * @param	array
	 * @param	mixed
	 * @return	mixed	depends on what the array contains
	 */
	function elements($items, $array, $default = NULL)
	{
		$return = array();

		is_array($items) OR $items = array($items);

		foreach ($items as $item)
		{
			$return[$item] = array_key_exists($item, $array) ? $array[$item] : $default;
		}

		return $return;
	}
}

/* End of file array_helper.php */
/* Location: ./system/helpers/array_helper.php */