system/helpers/url_helper.php

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

/**
 * Code Igniter URL Helpers
 *
 * @package		CodeIgniter
 * @subpackage	Helpers
 * @category	Helpers
 * @author		Rick Ellis
 * @link		http://www.codeigniter.com/user_guide/helpers/url_helper.html
 */

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

/**
 * Site URL
 *
 * Create a local URL based on your basepath. Segments can be passed via the 
 * first parameter either as a string or an array.
 *
 * @access	public
 * @param	string
 * @return	string
 */	
function site_url($uri = '')
{ 
	$obj =& get_instance();
	return $obj->config->site_url($uri);
}
	
// ------------------------------------------------------------------------

/**
 * Base URL
 *
 * Returns the "base_url" item from your config file
 *
 * @access	public
 * @return	string
 */	
function base_url()
{ 
	$obj =& get_instance();
	return $obj->config->slash_item('base_url');
}
	
// ------------------------------------------------------------------------

/**
 * Index page
 *
 * Returns the "index_page" from your config file
 *
 * @access	public
 * @return	string
 */	
function index_page()
{ 
	$obj =& get_instance();
	return $obj->config->item('index_page');
}
	
// ------------------------------------------------------------------------

/**
 * Anchor Link
 *
 * Creates an anchor based on the local URL.
 *
 * @access	public
 * @param	string	the URL
 * @param	string	the link title
 * @param	mixed	any attributes
 * @return	string
 */	
function anchor($uri = '', $title = '', $attributes = '')
{
	$site_url = ( ! preg_match('!^\w+://!i', $uri)) ? site_url($uri) : $uri;
	
	if ($title == '')
	{
		$title = $site_url;
	}

	if ($attributes == '')
	{
		$attributes = ' title="'.$title.'"';
	}
	else
	{
		if (is_array($attributes))
		{
			$attributes = parse_url_attributes($attributes);
		}
	}

	return '<a href="'.$site_url.'"'.$attributes.'>'.$title.'</a>';
}
	
// ------------------------------------------------------------------------

/**
 * Anchor Link - Pop-up version
 *
 * Creates an anchor based on the local URL. The link
 * opens a new window based on the attributes specified.
 *
 * @access	public
 * @param	string	the URL
 * @param	string	the link title
 * @param	mixed	any attributes
 * @return	string
 */
function anchor_popup($uri = '', $title = '', $attributes = FALSE)
{	
	$site_url = ( ! preg_match('!^\w+://!i', $uri)) ? site_url($uri) : $uri;
	
	if ($title == '')
	{
		$title = $site_url;
	}
	
	if ($attributes === FALSE)
	{
		return "<a href='javascript:void(0);' onclick=\"window.open('".$site_url."', '_blank');\">".$title."</a>";
	}
	
	if ( ! is_array($attributes))
	{
		$attributes = array();
	}
		
	foreach (array('width' => '800', 'height' => '600', 'scrollbars' => 'yes', 'status' => 'yes', 'resizable' => 'yes', 'screenx' => '0', 'screeny' => '0', ) as $key => $val)
	{
		$atts[$key] = ( ! isset($attributes[$key])) ? $val : $attributes[$key];
	}

	return "<a href='javascript:void(0);' onclick=\"window.open('".$site_url."', '_blank', '".parse_url_attributes($atts, TRUE)."');\">".$title."</a>";
}
	
// ------------------------------------------------------------------------

/**
 * Mailto Link
 *
 * @access	public
 * @param	string	the email address
 * @param	string	the link title
 * @param	mixed 	any attributes
 * @return	string
 */
function mailto($email, $title = '', $attributes = '')
{
	if ($title == "") 
	{
		$title = $email;
	}
	
	if (is_array($attributes))
	{
		$attributes = parse_url_attributes($attributes);
	}
	
	return '<a href="mailto:'.$email.'"'.$attributes.'>'.$title.'</a>';
}
	
// ------------------------------------------------------------------------

/**
 * Encoded Mailto Link
 *
 * Create a spam-protected mailto link written in Javascript
 *
 * @access	public
 * @param	string	the email address
 * @param	string	the link title
 * @param	mixed 	any attributes
 * @return	string
 */
function safe_mailto($email, $title = '', $attributes = '')
{
	if ($title == "") 
	{
		$title = $email;
	}
					
	for ($i = 0; $i < 16; $i++)
	{
		$x[] = substr('<a href="mailto:', $i, 1);
	}
	
	for ($i = 0; $i < strlen($email); $i++)
	{
		$x[] = "|".ord(substr($email, $i, 1));
	}

	$x[] = '"'; 

	if ($attributes != '')
	{
		if (is_array($attributes))
		{
			foreach ($attributes as $key => $val)
			{
				$x[] =  ' '.$key.'="';
				for ($i = 0; $i < strlen($val); $i++)
				{
					$x[] = "|".ord(substr($val, $i, 1));
				}
				$x[] = '"';
			}
		}
		else
		{	
			for ($i = 0; $i < strlen($attributes); $i++)
			{
				$x[] = substr($attributes, $i, 1);
			}
		}
	}	
	
	$x[] = '>';
	
	$temp = array();
	for ($i = 0; $i < strlen($title); $i++)
	{
		$ordinal = ord($title[$i]);
	
		if ($ordinal < 128)
		{
			$x[] = "|".$ordinal;            
		}
		else
		{
			if (count($temp) == 0)
			{
				$count = ($ordinal < 224) ? 2 : 3;
			}
		
			$temp[] = $ordinal;
			if (count($temp) == $count)
			{
				$number = ($count == 3) ? (($temp['0'] % 16) * 4096) + (($temp['1'] % 64) * 64) + ($temp['2'] % 64) : (($temp['0'] % 32) * 64) + ($temp['1'] % 64);
				$x[] = "|".$number;
				$count = 1;
				$temp = array();
			}   
		}
	}
	
	$x[] = '<'; $x[] = '/'; $x[] = 'a'; $x[] = '>';
	
	$x = array_reverse($x);
	ob_start();
	
?><script type="text/javascript">
//<![CDATA[
var l=new Array();
<?php
$i = 0;
foreach ($x as $val){ ?>l[<?php echo $i++; ?>]='<?php echo $val; ?>';<?php } ?>

for (var i = l.length-1; i >= 0; i=i-1){ 
if (l[i].substring(0, 1) == '|') document.write("&#"+unescape(l[i].substring(1))+";"); 
else document.write(unescape(l[i]));}
//]]>
</script><?php

	$buffer = ob_get_contents();
	ob_end_clean(); 
	return $buffer;        
}
	
// ------------------------------------------------------------------------

/**
 * Auto-linker
 *
 * Automatically links URL and Email addresses.
 * Note: There's a bit of extra code here to deal with
 * URLs or emails that end in a period.  We'll strip these
 * off and add them after the link.
 *
 * @access	public
 * @param	string	the string
 * @param	string	the type: email, url, or both 
 * @param	bool 	whether to create pop-up links
 * @return	string
 */
function auto_link($str, $type = 'both', $popup = FALSE)
{
	if ($type != 'email')
	{		
		if (preg_match_all("#(^|\s|\()((http(s?)://)|(www\.))(\w+[^\s\)\<]+)#i", $str, $matches))
		{
			$pop = ($popup == TRUE) ? " target=\"_blank\" " : "";
		
			for ($i = 0; $i < sizeof($matches['0']); $i++)
			{
				$period = '';
				if (preg_match("|\.$|", $matches['6'][$i]))
				{
					$period = '.';
					$matches['6'][$i] = substr($matches['6'][$i], 0, -1);
				}
			
				$str = str_replace($matches['0'][$i],
									$matches['1'][$i].'<a href="http'.
									$matches['4'][$i].'://'.
									$matches['5'][$i].
									$matches['6'][$i].'"'.$pop.'>http'.
									$matches['4'][$i].'://'.
									$matches['5'][$i].
									$matches['6'][$i].'</a>'.
									$period, $str);
			}
		}
	}

	if ($type != 'url')
	{	
		if (preg_match_all("/([a-zA-Z0-9_\.\-]+)@([a-zA-Z0-9\-]+)\.([a-zA-Z0-9\-\.]*)/i", $str, $matches))
		{
			for ($i = 0; $i < sizeof($matches['0']); $i++)
			{
				$period = '';
				if (preg_match("|\.$|", $matches['3'][$i]))
				{
					$period = '.';
					$matches['3'][$i] = substr($matches['3'][$i], 0, -1);
				}
			
				$str = str_replace($matches['0'][$i], safe_mailto($matches['1'][$i].'@'.$matches['2'][$i].'.'.$matches['3'][$i]).$period, $str);
			}
		
		}
	}
	return $str;
}
	
// ------------------------------------------------------------------------

/**
 * Prep URL
 *
 * Simply adds the http:// part if missing
 *
 * @access	public
 * @param	string	the URL
 * @return	string
 */
function prep_url($str = '')
{
	if ($str == 'http://' OR $str == '')
	{
		return '';
	}
	
	if (substr($str, 0, 7) != 'http://' && substr($str, 0, 8) != 'https://')
	{
		$str = 'http://'.$str;
	}
	
	return $str;
}
	
// ------------------------------------------------------------------------

/**
 * Create URL Title
 *
 * Takes a "title" string as input and creates a
 * human-friendly URL string with either a dash
 * or an underscore as the word separator.
 *
 * @access	public
 * @param	string	the string
 * @param	string	the separator: dash, or underscore
 * @return	string
 */
function url_title($str, $separator = 'dash')
{
	if ($separator == 'dash')
	{
		$search		= '_';
		$replace	= '-';
	}
	else
	{
		$search		= '-';
		$replace	= '_';
	}
		
	$trans = array(
					$search								=> $replace,
					"\s+"								=> $replace,
					"[^a-z0-9".$replace."]"				=> '',
					$replace."+"						=> $replace,
					$replace."$"						=> '',
					"^".$replace						=> ''
				   );

	$str = strip_tags(strtolower($str));
	
	foreach ($trans as $key => $val)
	{
		$str = preg_replace("#".$key."#", $val, $str);
	} 
	
	return trim(stripslashes($str));
}
	
// ------------------------------------------------------------------------

/**
 * Header Redirect
 *
 * Header redirect in two flavors
 *
 * @access	public
 * @param	string	the URL
 * @param	string	the method: location or redirect
 * @return	string
 */
function redirect($uri = '', $method = 'location')
{  
	switch($method)
	{
		case 'refresh' : header("Refresh:0;url=".site_url($uri));
			break;
		default        : header("location:".site_url($uri));
			break;
	}
	exit;
}
	
// ------------------------------------------------------------------------

/**
 * Parse out the attributes
 *
 * Some of the functions use this
 *
 * @access	private
 * @param	array
 * @param	bool
 * @return	string
 */
function parse_url_attributes($attributes, $javascript = FALSE)
{
	$att = '';
	foreach ($attributes as $key => $val)
	{
		if ($javascript == TRUE)
		{
			$att .= $key . '=' . $val . ',';
		}
		else
		{
			$att .= ' ' . $key . '="' . $val . '"';
		}
	}
	
	if ($javascript == TRUE)
	{
		$att = substr($att, 0, -1);
	}
	
	return $att;
}

?>