system/helpers/url_helper.php

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * 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 - 2012, 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
 */

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

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

if ( ! function_exists('site_url'))
{
	/**
	 * 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.
	 *
	 * @param	string
	 * @return	string
	 */
	function site_url($uri = '')
	{
		$CI =& get_instance();
		return $CI->config->site_url($uri);
	}
}

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

if ( ! function_exists('base_url'))
{
	/**
	 * Base URL
	 *
	 * Create a local URL based on your basepath.
	 * Segments can be passed in as a string or an array, same as site_url
	 * or a URL to a file can be passed in, e.g. to an image file.
	 *
	 * @param	string
	 * @return	string
	 */
	function base_url($uri = '')
	{
		$CI =& get_instance();
		return $CI->config->base_url($uri);
	}
}

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

if ( ! function_exists('current_url'))
{
	/**
	 * Current URL
	 *
	 * Returns the full URL (including segments) of the page where this
	 * function is placed
	 *
	 * @return	string
	 */
	function current_url()
	{
		$CI =& get_instance();
		return $CI->config->site_url($CI->uri->uri_string());
	}
}

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

if ( ! function_exists('uri_string'))
{
	/**
	 * URL String
	 *
	 * Returns the URI segments.
	 *
	 * @return	string
	 */
	function uri_string()
	{
		$CI =& get_instance();
		return $CI->uri->uri_string();
	}
}

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

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

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

if ( ! function_exists('anchor'))
{
	/**
	 * Anchor Link
	 *
	 * Creates an anchor based on the local URL.
	 *
	 * @param	string	the URL
	 * @param	string	the link title
	 * @param	mixed	any attributes
	 * @return	string
	 */
	function anchor($uri = '', $title = '', $attributes = '')
	{
		$title = (string) $title;

		if ( ! is_array($uri))
		{
			$site_url = preg_match('!^\w+://! i', $uri) ? $uri : site_url($uri);
		}
		else
		{
			$site_url = site_url($uri);
		}

		if ($title === '')
		{
			$title = $site_url;
		}

		if ($attributes !== '')
		{
			$attributes = _parse_attributes($attributes);
		}

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

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

if ( ! function_exists('anchor_popup'))
{
	/**
	 * Anchor Link - Pop-up version
	 *
	 * Creates an anchor based on the local URL. The link
	 * opens a new window based on the attributes specified.
	 *
	 * @param	string	the URL
	 * @param	string	the link title
	 * @param	mixed	any attributes
	 * @return	string
	 */
	function anchor_popup($uri = '', $title = '', $attributes = FALSE)
	{
		$title = (string) $title;
		$site_url = preg_match('!^\w+://! i', $uri) ? $uri : site_url($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]) ? $attributes[$key] : $val;
			unset($attributes[$key]);
		}

		if ($attributes !== '')
		{
			$attributes = _parse_attributes($attributes);
		}

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

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

if ( ! function_exists('mailto'))
{
	/**
	 * Mailto Link
	 *
	 * @param	string	the email address
	 * @param	string	the link title
	 * @param	mixed	any attributes
	 * @return	string
	 */
	function mailto($email, $title = '', $attributes = '')
	{
		$title = (string) $title;

		if ($title === '')
		{
			$title = $email;
		}

		return '<a href="mailto:'.$email.'"'._parse_attributes($attributes).'>'.$title.'</a>';
	}
}

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

if ( ! function_exists('safe_mailto'))
{
	/**
	 * Encoded Mailto Link
	 *
	 * Create a spam-protected mailto link written in Javascript
	 *
	 * @param	string	the email address
	 * @param	string	the link title
	 * @param	mixed	any attributes
	 * @return	string
	 */
	function safe_mailto($email, $title = '', $attributes = '')
	{
		$title = (string) $title;

		if ($title === '')
		{
			$title = $email;
		}

		$x = str_split('<a href="mailto:', 1);

		for ($i = 0, $l = strlen($email); $i < $l; $i++)
		{
			$x[] = '|'.ord($email[$i]);
		}

		$x[] = '"';

		if ($attributes !== '')
		{
			if (is_array($attributes))
			{
				foreach ($attributes as $key => $val)
				{
					$x[] =  ' '.$key.'="';
					for ($i = 0, $l = strlen($val); $i < $l; $i++)
					{
						$x[] = '|'.ord($val[$i]);
					}
					$x[] = '"';
				}
			}
			else
			{
				for ($i = 0, $l = strlen($attributes); $i < $l; $i++)
				{
					$x[] = $attributes[$i];
				}
			}
		}

		$x[] = '>';

		$temp = array();
		for ($i = 0, $l = strlen($title); $i < $l; $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
	for ($i = 0, $c = count($x); $i < $c; $i++) { ?>l[<?php echo $i; ?>]='<?php echo $x[$i]; ?>';<?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;
	}
}

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

if ( ! function_exists('auto_link'))
{
	/**
	 * 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.
	 *
	 * @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' && preg_match_all('#(^|\s|\(|\b)((http(s?)://)|(www\.))(\w+[^\s\)\<]+)#i', $str, $matches))
		{
			$pop = ($popup) ? ' target="_blank" ' : '';

			for ($i = 0, $c = count($matches[0]); $i < $c; $i++)
			{
				if (preg_match('|\.$|', $matches[6][$i]))
				{
					$period = '.';
					$matches[6][$i] = substr($matches[6][$i], 0, -1);
				}
				else
				{
					$period = '';
				}

				$str = str_replace($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' && preg_match_all('/([a-zA-Z0-9_\.\-\+]+)@([a-zA-Z0-9\-]+)\.([a-zA-Z0-9\-\.]*)/i', $str, $matches))
		{
			for ($i = 0, $c = count($matches); $i < $c; $i++)
			{
				if (preg_match('|\.$|', $matches[3][$i]))
				{
					$period = '.';
					$matches[3][$i] = substr($matches[3][$i], 0, -1);
				}
				else
				{
					$period = '';
				}

				$str = str_replace($matches[0][$i], safe_mailto($matches[1][$i].'@'.$matches[2][$i].'.'.$matches[3][$i]).$period, $str);
			}
		}

		return $str;
	}
}

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

if ( ! function_exists('prep_url'))
{
	/**
	 * Prep URL
	 *
	 * Simply adds the http:// part if no scheme is included
	 *
	 * @param	string	the URL
	 * @return	string
	 */
	function prep_url($str = '')
	{
		if ($str === 'http://' OR $str === '')
		{
			return '';
		}

		$url = parse_url($str);

		if ( ! $url OR ! isset($url['scheme']))
		{
			return 'http://'.$str;
		}

		return $str;
	}
}

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

if ( ! function_exists('url_title'))
{
	/**
	 * Create URL Title
	 *
	 * Takes a "title" string as input and creates a
	 * human-friendly URL string with a "separator" string
	 * as the word separator.
	 *
	 * @param	string	the string
	 * @param	string	the separator
	 * @param	bool
	 * @return	string
	 */
	function url_title($str, $separator = '-', $lowercase = FALSE)
	{
		if ($separator === 'dash')
		{
			$separator = '-';
		}
		elseif ($separator === 'underscore')
		{
			$separator = '_';
		}

		$q_separator = preg_quote($separator);

		$trans = array(
				'&.+?;'			=> '',
				'[^a-z0-9 _-]'		=> '',
				'\s+'			=> $separator,
				'('.$q_separator.')+'	=> $separator
			);

		$str = strip_tags($str);
		foreach ($trans as $key => $val)
		{
			$str = preg_replace('#'.$key.'#i', $val, $str);
		}

		if ($lowercase === TRUE)
		{
			$str = strtolower($str);
		}

		return trim(trim($str, $separator));
	}
}

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

if ( ! function_exists('redirect'))
{
	/**
	 * Header Redirect
	 *
	 * Header redirect in two flavors
	 * For very fine grained control over headers, you could use the Output
	 * Library's set_header() function.
	 *
	 * @param	string	the URL
	 * @param	string	the method: location or refresh
	 * @param	int
	 * @return	string
	 */
	function redirect($uri = '', $method = 'auto', $http_response_code = 302)
	{
		if ( ! preg_match('#^https?://#i', $uri))
		{
			$uri = site_url($uri);
		}

		// IIS environment likely? Use 'refresh' for better compatibility
		if (DIRECTORY_SEPARATOR !== '/' && $method === 'auto')
		{
			$method = 'refresh';
		}

		switch($method)
		{
			case 'refresh':
				header('Refresh:0;url='.$uri);
				break;
			default:
				header('Location: '.$uri, TRUE, $http_response_code);
				break;
		}
		exit;
	}
}

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

if ( ! function_exists('_parse_attributes'))
{
	/**
	 * Parse out the attributes
	 *
	 * Some of the functions use this
	 *
	 * @param	array
	 * @param	bool
	 * @return	string
	 */
	function _parse_attributes($attributes, $javascript = FALSE)
	{
		if (is_string($attributes))
		{
			return ($attributes !== '') ? ' '.$attributes : '';
		}

		$att = '';
		foreach ($attributes as $key => $val)
		{
			if ($javascript === TRUE)
			{
				$att .= $key.'='.$val.',';
			}
			else
			{
				$att .= ' '.$key.'="'.$val.'"';
			}
		}

		if ($javascript === TRUE && $att !== '')
		{
			return substr($att, 0, -1);
		}

		return $att;
	}
}

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