system/helpers/smiley_helper.php

<?php  if (!defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 4.3.2 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2006, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */

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

/**
 * CodeIgniter Smiley Helpers
 *
 * @package		CodeIgniter
 * @subpackage	Helpers
 * @category	Helpers
 * @author		ExpressionEngine Dev Team
 * @link		http://codeigniter.com/user_guide/helpers/smiley_helper.html
 */

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

/**
 * JS Insert Smiley
 *
 * Generates the javascrip function needed to insert smileys into a form field
 *
 * @access	public
 * @param	string	form name
 * @param	string	field name
 * @return	string
 */	
if (! function_exists('js_insert_smiley'))
{
	function js_insert_smiley($form_name = '', $form_field = '')
	{
		return <<<EOF
<script type="text/javascript">
	function insert_smiley(smiley)
	{
		document.{$form_name}.{$form_field}.value += " " + smiley;
	}
</script>
EOF;
	}	
}
// ------------------------------------------------------------------------

/**
 * Get Clickable Smileys
 *
 * Returns an array of image tag links that can be clicked to be inserted 
 * into a form field.  
 *
 * @access	public
 * @param	string	the URL to the folder containing the smiley images
 * @return	array
 */	
if (! function_exists('get_clickable_smileys'))
{
	function get_clickable_smileys($image_url = '', $smileys = NULL)
	{
		if (! is_array($smileys))
		{
			if (FALSE === ($smileys = _get_smiley_array()))
			{
				return $smileys;
			}        
		}

		// Add a trailing slash to the file path if needed
		$image_url = preg_replace("/(.+?)\/*$/", "\\1/",  $image_url);
	
		$used = array();
		foreach ($smileys as $key => $val)
		{
			// Keep duplicates from being used, which can happen if the
			// mapping array contains multiple identical replacements.  For example:
			// :-) and :) might be replaced with the same image so both smileys
			// will be in the array.
			if (isset($used[$smileys[$key][0]]))
			{
				continue;
			}
	
			$link[] = "<a href=\"javascript:void(0);\" onClick=\"insert_smiley('".$key."')\"><img src=\"".$image_url.$smileys[$key][0]."\" width=\"".$smileys[$key][1]."\" height=\"".$smileys[$key][2]."\" alt=\"".$smileys[$key][3]."\" style=\"border:0;\" /></a>";	
	
			$used[$smileys[$key][0]] = TRUE;
		}
	
		return $link;
	}
}

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

/**
 * Parse Smileys
 *
 * Takes a string as input and swaps any contained smileys for the actual image
 *
 * @access	public
 * @param	string	the text to be parsed
 * @param	string	the URL to the folder containing the smiley images
 * @return	string
 */	
if (! function_exists('parse_smileys'))
{
	function parse_smileys($str = '', $image_url = '', $smileys = NULL)
	{
		if ($image_url == '')
		{
			return $str;
		}

		if (! is_array($smileys))
		{
			if (FALSE === ($smileys = _get_smiley_array()))
			{
				return $str;
			}        
		}
	
		// Add a trailing slash to the file path if needed
		$image_url = preg_replace("/(.+?)\/*$/", "\\1/",  $image_url);

		foreach ($smileys as $key => $val)
		{        
			$str = str_replace($key, "<img src=\"".$image_url.$smileys[$key][0]."\" width=\"".$smileys[$key][1]."\" height=\"".$smileys[$key][2]."\" alt=\"".$smileys[$key][3]."\" style=\"border:0;\" />", $str);
		}
	
		return $str;
	}
}

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

/**
 * Get Smiley Array
 *
 * Fetches the config/smiley.php file
 *
 * @access	private
 * @return	mixed
 */	
if (! function_exists('_get_smiley_array'))
{
	function _get_smiley_array()
	{
		if (! file_exists(APPPATH.'config/smileys'.EXT))
		{
			return FALSE;
		}

		include(APPPATH.'config/smileys'.EXT);
	
		if (! isset($smileys) OR ! is_array($smileys))
		{
			return FALSE;
		}
	
		return $smileys;
	}
}