system/core/URI.php - code-igniter-v3-giggi - Gitiles

 <?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
  */

 /**
  * URI Class
  *
  * Parses URIs and determines routing
  *
  * @package		CodeIgniter
  * @subpackage	Libraries
  * @category	URI
  * @author		EllisLab Dev Team
  * @link		http://codeigniter.com/user_guide/libraries/uri.html
  */
 class CI_URI {

 	/**
 	 * List of cached uri segments
 	 *
 	 * @var array
 	 */
 	public $keyval =	array();

 	/**
 	 * Current uri string
 	 *
 	 * @var string
 	 */
 	public $uri_string;

 	/**
 	 * List of uri segments
 	 *
 	 * @var array
 	 */
 	public $segments =	array();

 	/**
 	 * Re-indexed list of uri segments
 	 * Starts at 1 instead of 0
 	 *
 	 * @var array
 	 */
 	public $rsegments =	array();

 	/**
 	 * Constructor
 	 *
 	 * Simply globalizes the $RTR object. The front
 	 * loads the Router class early on so it's not available
 	 * normally as other classes are.
 	 *
 	 * @return	void
 	 */
 	public function __construct()
 	{
 		$this->config =& load_class('Config', 'core');
 		log_message('debug', 'URI Class Initialized');
 	}

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

 	/**
 	 * Get the URI String
 	 *
 	 * Called by CI_Router
 	 *
 	 * @return	void
 	 */
 	public function _fetch_uri_string()
 	{
 		if (strtoupper($this->config->item('uri_protocol')) === 'AUTO')
 		{
 			// Is the request coming from the command line?
 			if ($this->_is_cli_request())
 			{
 				$this->_set_uri_string($this->_parse_cli_args());
 				return;
 			}

 			// Let's try the REQUEST_URI first, this will work in most situations
 			if ($uri = $this->_detect_uri())
 			{
 				$this->_set_uri_string($uri);
 				return;
 			}

 			// Is there a PATH_INFO variable?
 			// Note: some servers seem to have trouble with getenv() so we'll test it two ways
 			$path = isset($_SERVER['PATH_INFO']) ? $_SERVER['PATH_INFO'] : @getenv('PATH_INFO');
 			if (trim($path, '/') !== '' && $path !== '/'.SELF)
 			{
 				$this->_set_uri_string($path);
 				return;
 			}

 			// No PATH_INFO?... What about QUERY_STRING?
 			$path = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : @getenv('QUERY_STRING');
 			if (trim($path, '/') !== '')
 			{
 				$this->_set_uri_string($path);
 				return;
 			}

 			// As a last ditch effort lets try using the $_GET array
 			if (is_array($_GET) && count($_GET) === 1 && trim(key($_GET), '/') !== '')
 			{
 				$this->_set_uri_string(key($_GET));
 				return;
 			}

 			// We've exhausted all our options...
 			$this->uri_string = '';
 			return;
 		}

 		$uri = strtoupper($this->config->item('uri_protocol'));

 		if ($uri === 'REQUEST_URI')
 		{
 			$this->_set_uri_string($this->_detect_uri());
 			return;
 		}
 		elseif ($uri === 'CLI')
 		{
 			$this->_set_uri_string($this->_parse_cli_args());
 			return;
 		}

 		$path = isset($_SERVER[$uri]) ? $_SERVER[$uri] : @getenv($uri);
 		$this->_set_uri_string($path);
 	}

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

 	/**
 	 * Set the URI String
 	 *
 	 * @param 	string
 	 * @return	void
 	 */
 	public function _set_uri_string($str)
 	{
 		// Filter out control characters
 		$str = remove_invisible_characters($str, FALSE);

 		// If the URI contains only a slash we'll kill it
 		$this->uri_string = ($str === '/') ? '' : $str;
 	}

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

 	/**
 	 * Detects the URI
 	 *
 	 * This function will detect the URI automatically and fix the query string
 	 * if necessary.
 	 *
 	 * @return	string
 	 */
 	protected function _detect_uri()
 	{
 		if ( ! isset($_SERVER['REQUEST_URI'], $_SERVER['SCRIPT_NAME']))
 		{
 			return '';
 		}

 		$uri = $_SERVER['REQUEST_URI'];
 		if (strpos($uri, $_SERVER['SCRIPT_NAME']) === 0)
 		{
 			$uri = substr($uri, strlen($_SERVER['SCRIPT_NAME']));
 		}
 		elseif (strpos($uri, dirname($_SERVER['SCRIPT_NAME'])) === 0)
 		{
 			$uri = substr($uri, strlen(dirname($_SERVER['SCRIPT_NAME'])));
 		}

 		// This section ensures that even on servers that require the URI to be in the query string (Nginx) a correct
 		// URI is found, and also fixes the QUERY_STRING server var and $_GET array.
 		if (strncmp($uri, '?/', 2) === 0)
 		{
 			$uri = substr($uri, 2);
 		}
 		$parts = preg_split('#\?#i', $uri, 2);
 		$uri = $parts[0];
 		if (isset($parts[1]))
 		{
 			$_SERVER['QUERY_STRING'] = $parts[1];
 			parse_str($_SERVER['QUERY_STRING'], $_GET);
 		}
 		else
 		{
 			$_SERVER['QUERY_STRING'] = '';
 			$_GET = array();
 		}

 		if ($uri === '/' OR empty($uri))
 		{
 			return '/';
 		}

 		$uri = parse_url($uri, PHP_URL_PATH);

 		// Do some final cleaning of the URI and return it
 		return str_replace(array('//', '../'), '/', trim($uri, '/'));
 	}

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

 	/**
 	 * Is cli Request?
 	 *
 	 * Duplicate of function from the Input class to test to see if a request was made from the command line
 	 *
 	 * @return 	bool
 	 */
 	protected function _is_cli_request()
 	{
 		return (php_sapi_name() === 'cli') OR defined('STDIN');
 	}

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

 	/**
 	 * Parse cli arguments
 	 *
 	 * Take each command line argument and assume it is a URI segment.
 	 *
 	 * @return	string
 	 */
 	protected function _parse_cli_args()
 	{
 		$args = array_slice($_SERVER['argv'], 1);
 		return $args ? '/'.implode('/', $args) : '';
 	}

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

 	/**
 	 * Filter segments for malicious characters
 	 *
 	 * Called by CI_Router
 	 *
 	 * @param	string
 	 * @return	string
 	 */
 	public function _filter_uri($str)
 	{
 		if ($str !== '' && $this->config->item('permitted_uri_chars') != '' && $this->config->item('enable_query_strings') === FALSE)
 		{
 			// preg_quote() in PHP 5.3 escapes -, so the str_replace() and addition of - to preg_quote() is to maintain backwards
 			// compatibility as many are unaware of how characters in the permitted_uri_chars will be parsed as a regex pattern
 			if ( ! preg_match('|^['.str_replace(array('\\-', '\-'), '-', preg_quote($this->config->item('permitted_uri_chars'), '-')).']+$|i', $str))
 			{
 				show_error('The URI you submitted has disallowed characters.', 400);
 			}
 		}

 		// Convert programatic characters to entities and return
 		return str_replace(
 					array('$',     '(',     ')',     '%28',   '%29'), // Bad
 					array('&#36;', '&#40;', '&#41;', '&#40;', '&#41;'), // Good
 					$str);
 	}

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

 	/**
 	 * Remove the suffix from the URL if needed
 	 *
 	 * Called by CI_Router
 	 *
 	 * @return	void
 	 */
 	public function _remove_url_suffix()
 	{
 		if  ($this->config->item('url_suffix') !== '')
 		{
 			$this->uri_string = preg_replace('|'.preg_quote($this->config->item('url_suffix')).'$|', '', $this->uri_string);
 		}
 	}

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

 	/**
 	 * Explode the URI Segments. The individual segments will
 	 * be stored in the $this->segments array.
 	 *
 	 * Called by CI_Router
 	 *
 	 * @return	void
 	 */
 	public function _explode_segments()
 	{
 		foreach (explode('/', preg_replace('|/*(.+?)/*$|', '\\1', $this->uri_string)) as $val)
 		{
 			// Filter segments for security
 			$val = trim($this->_filter_uri($val));

 			if ($val !== '')
 			{
 				$this->segments[] = $val;
 			}
 		}
 	}

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

 	/**
 	 * Re-index Segments
 	 *
 	 * This function re-indexes the $this->segment array so that it
 	 * starts at 1 rather than 0. Doing so makes it simpler to
 	 * use functions like $this->uri->segment(n) since there is
 	 * a 1:1 relationship between the segment array and the actual segments.
 	 *
 	 * Called by CI_Router
 	 *
 	 * @return	void
 	 */
 	public function _reindex_segments()
 	{
 		array_unshift($this->segments, NULL);
 		array_unshift($this->rsegments, NULL);
 		unset($this->segments[0]);
 		unset($this->rsegments[0]);
 	}

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

 	/**
 	 * Fetch a URI Segment
 	 *
 	 * This function returns the URI segment based on the number provided.
 	 *
 	 * @param	int
 	 * @param	mixed
 	 * @return	string
 	 */
 	public function segment($n, $no_result = NULL)
 	{
 		return isset($this->segments[$n]) ? $this->segments[$n] : $no_result;
 	}

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

 	/**
 	 * Fetch a URI "routed" Segment
 	 *
 	 * This function returns the re-routed URI segment (assuming routing rules are used)
 	 * based on the number provided. If there is no routing this function returns the
 	 * same result as $this->segment()
 	 *
 	 * @param	int
 	 * @param	mixed
 	 * @return	string
 	 */
 	public function rsegment($n, $no_result = NULL)
 	{
 		return isset($this->rsegments[$n]) ? $this->rsegments[$n] : $no_result;
 	}

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

 	/**
 	 * Generate a key value pair from the URI string
 	 *
 	 * This function generates and associative array of URI data starting
 	 * at the supplied segment. For example, if this is your URI:
 	 *
 	 *	example.com/user/search/name/joe/location/UK/gender/male
 	 *
 	 * You can use this function to generate an array with this prototype:
 	 *
 	 * array (
 	 *			name => joe
 	 *			location => UK
 	 *			gender => male
 	 *		 )
 	 *
 	 * @param	int	the starting segment number
 	 * @param	array	an array of default values
 	 * @return	array
 	 */
 	public function uri_to_assoc($n = 3, $default = array())
 	{
 		return $this->_uri_to_assoc($n, $default, 'segment');
 	}

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

 	/**
 	 * Identical to above only it uses the re-routed segment array
 	 *
 	 * @param 	int	the starting segment number
 	 * @param 	array	an array of default values
 	 * @return 	array
 	 */
 	public function ruri_to_assoc($n = 3, $default = array())
 	{
 		return $this->_uri_to_assoc($n, $default, 'rsegment');
 	}

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

 	/**
 	 * Generate a key value pair from the URI string or Re-routed URI string
 	 *
 	 * @param	int	the starting segment number
 	 * @param	array	an array of default values
 	 * @param	string	which array we should use
 	 * @return	array
 	 */
 	protected function _uri_to_assoc($n = 3, $default = array(), $which = 'segment')
 	{
 		if ( ! is_numeric($n))
 		{
 			return $default;
 		}

 		if (isset($this->keyval[$n]))
 		{
 			return $this->keyval[$n];
 		}

 		if ($which === 'segment')
 		{
 			$total_segments = 'total_segments';
 			$segment_array = 'segment_array';
 		}
 		else
 		{
 			$total_segments = 'total_rsegments';
 			$segment_array = 'rsegment_array';
 		}

 		if ($this->$total_segments() < $n)
 		{
 			return (count($default) === 0)
 				? array()
 				: array_fill_keys($default, NULL);
 		}

 		$segments = array_slice($this->$segment_array(), ($n - 1));
 		$i = 0;
 		$lastval = '';
 		$retval  = array();
 		foreach ($segments as $seg)
 		{
 			if ($i % 2)
 			{
 				$retval[$lastval] = $seg;
 			}
 			else
 			{
 				$retval[$seg] = NULL;
 				$lastval = $seg;
 			}

 			$i++;
 		}

 		if (count($default) > 0)
 		{
 			foreach ($default as $val)
 			{
 				if ( ! array_key_exists($val, $retval))
 				{
 					$retval[$val] = NULL;
 				}
 			}
 		}

 		// Cache the array for reuse
 		$this->keyval[$n] = $retval;
 		return $retval;
 	}

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

 	/**
 	 * Generate a URI string from an associative array
 	 *
 	 * @param	array	an associative array of key/values
 	 * @return	array
 	 */
 	public function assoc_to_uri($array)
 	{
 		$temp = array();
 		foreach ((array) $array as $key => $val)
 		{
 			$temp[] = $key;
 			$temp[] = $val;
 		}

 		return implode('/', $temp);
 	}

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

 	/**
 	 * Fetch a URI Segment and add a trailing slash
 	 *
 	 * @param	int
 	 * @param	string
 	 * @return	string
 	 */
 	public function slash_segment($n, $where = 'trailing')
 	{
 		return $this->_slash_segment($n, $where, 'segment');
 	}

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

 	/**
 	 * Fetch a URI Segment and add a trailing slash
 	 *
 	 * @param	int
 	 * @param	string
 	 * @return	string
 	 */
 	public function slash_rsegment($n, $where = 'trailing')
 	{
 		return $this->_slash_segment($n, $where, 'rsegment');
 	}

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

 	/**
 	 * Fetch a URI Segment and add a trailing slash - helper function
 	 *
 	 * @param	int
 	 * @param	string
 	 * @param	string
 	 * @return	string
 	 */
 	protected function _slash_segment($n, $where = 'trailing', $which = 'segment')
 	{
 		$leading = $trailing = '/';

 		if ($where === 'trailing')
 		{
 			$leading	= '';
 		}
 		elseif ($where === 'leading')
 		{
 			$trailing	= '';
 		}

 		return $leading.$this->$which($n).$trailing;
 	}

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

 	/**
 	 * Segment Array
 	 *
 	 * @return	array
 	 */
 	public function segment_array()
 	{
 		return $this->segments;
 	}

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

 	/**
 	 * Routed Segment Array
 	 *
 	 * @return	array
 	 */
 	public function rsegment_array()
 	{
 		return $this->rsegments;
 	}

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

 	/**
 	 * Total number of segments
 	 *
 	 * @return	int
 	 */
 	public function total_segments()
 	{
 		return count($this->segments);
 	}

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

 	/**
 	 * Total number of routed segments
 	 *
 	 * @return	int
 	 */
 	public function total_rsegments()
 	{
 		return count($this->rsegments);
 	}

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

 	/**
 	 * Fetch the entire URI string
 	 *
 	 * @return	string
 	 */
 	public function uri_string()
 	{
 		return $this->uri_string;
 	}


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

 	/**
 	 * Fetch the entire Re-routed URI string
 	 *
 	 * @return	string
 	 */
 	public function ruri_string()
 	{
 		return implode('/', $this->rsegment_array());
 	}

 }

 /* End of file URI.php */
 /* Location: ./system/core/URI.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
	*/

	/**
	* URI Class
	*
	* Parses URIs and determines routing
	*
	* @package CodeIgniter
	* @subpackage Libraries
	* @category URI
	* @author EllisLab Dev Team
	* @link http://codeigniter.com/user_guide/libraries/uri.html
	*/
	class CI_URI {

	/**
	* List of cached uri segments
	*
	* @var array
	*/
	public $keyval = array();

	/**
	* Current uri string
	*
	* @var string
	*/
	public $uri_string;

	/**
	* List of uri segments
	*
	* @var array
	*/
	public $segments = array();

	/**
	* Re-indexed list of uri segments
	* Starts at 1 instead of 0
	*
	* @var array
	*/
	public $rsegments = array();

	/**
	* Constructor
	*
	* Simply globalizes the $RTR object. The front
	* loads the Router class early on so it's not available
	* normally as other classes are.
	*
	* @return void
	*/
	public function __construct()
	{
	$this->config =& load_class('Config', 'core');
	log_message('debug', 'URI Class Initialized');
	}

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

	/**
	* Get the URI String
	*
	* Called by CI_Router
	*
	* @return void
	*/
	public function _fetch_uri_string()
	{
	if (strtoupper($this->config->item('uri_protocol')) === 'AUTO')
	{
	// Is the request coming from the command line?
	if ($this->_is_cli_request())
	{
	$this->_set_uri_string($this->_parse_cli_args());
	return;
	}

	// Let's try the REQUEST_URI first, this will work in most situations
	if ($uri = $this->_detect_uri())
	{
	$this->_set_uri_string($uri);
	return;
	}

	// Is there a PATH_INFO variable?
	// Note: some servers seem to have trouble with getenv() so we'll test it two ways
	$path = isset($_SERVER['PATH_INFO']) ? $_SERVER['PATH_INFO'] : @getenv('PATH_INFO');
	if (trim($path, '/') !== '' && $path !== '/'.SELF)
	{
	$this->_set_uri_string($path);
	return;
	}

	// No PATH_INFO?... What about QUERY_STRING?
	$path = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : @getenv('QUERY_STRING');
	if (trim($path, '/') !== '')
	{
	$this->_set_uri_string($path);
	return;
	}

	// As a last ditch effort lets try using the $_GET array
	if (is_array($_GET) && count($_GET) === 1 && trim(key($_GET), '/') !== '')
	{
	$this->_set_uri_string(key($_GET));
	return;
	}

	// We've exhausted all our options...
	$this->uri_string = '';
	return;
	}

	$uri = strtoupper($this->config->item('uri_protocol'));

	if ($uri === 'REQUEST_URI')
	{
	$this->_set_uri_string($this->_detect_uri());
	return;
	}
	elseif ($uri === 'CLI')
	{
	$this->_set_uri_string($this->_parse_cli_args());
	return;
	}

	$path = isset($_SERVER[$uri]) ? $_SERVER[$uri] : @getenv($uri);
	$this->_set_uri_string($path);
	}

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

	/**
	* Set the URI String
	*
	* @param string
	* @return void
	*/
	public function _set_uri_string($str)
	{
	// Filter out control characters
	$str = remove_invisible_characters($str, FALSE);

	// If the URI contains only a slash we'll kill it
	$this->uri_string = ($str === '/') ? '' : $str;
	}

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

	/**
	* Detects the URI
	*
	* This function will detect the URI automatically and fix the query string
	* if necessary.
	*
	* @return string
	*/
	protected function _detect_uri()
	{
	if ( ! isset($_SERVER['REQUEST_URI'], $_SERVER['SCRIPT_NAME']))
	{
	return '';
	}

	$uri = $_SERVER['REQUEST_URI'];
	if (strpos($uri, $_SERVER['SCRIPT_NAME']) === 0)
	{
	$uri = substr($uri, strlen($_SERVER['SCRIPT_NAME']));
	}
	elseif (strpos($uri, dirname($_SERVER['SCRIPT_NAME'])) === 0)
	{
	$uri = substr($uri, strlen(dirname($_SERVER['SCRIPT_NAME'])));
	}

	// This section ensures that even on servers that require the URI to be in the query string (Nginx) a correct
	// URI is found, and also fixes the QUERY_STRING server var and $_GET array.
	if (strncmp($uri, '?/', 2) === 0)
	{
	$uri = substr($uri, 2);
	}
	$parts = preg_split('#\?#i', $uri, 2);
	$uri = $parts[0];
	if (isset($parts[1]))
	{
	$_SERVER['QUERY_STRING'] = $parts[1];
	parse_str($_SERVER['QUERY_STRING'], $_GET);
	}
	else
	{
	$_SERVER['QUERY_STRING'] = '';
	$_GET = array();
	}

	if ($uri === '/' OR empty($uri))
	{
	return '/';
	}

	$uri = parse_url($uri, PHP_URL_PATH);

	// Do some final cleaning of the URI and return it
	return str_replace(array('//', '../'), '/', trim($uri, '/'));
	}

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

	/**
	* Is cli Request?
	*
	* Duplicate of function from the Input class to test to see if a request was made from the command line
	*
	* @return bool
	*/
	protected function _is_cli_request()
	{
	return (php_sapi_name() === 'cli') OR defined('STDIN');
	}

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

	/**
	* Parse cli arguments
	*
	* Take each command line argument and assume it is a URI segment.
	*
	* @return string
	*/
	protected function _parse_cli_args()
	{
	$args = array_slice($_SERVER['argv'], 1);
	return $args ? '/'.implode('/', $args) : '';
	}

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

	/**
	* Filter segments for malicious characters
	*
	* Called by CI_Router
	*
	* @param string
	* @return string
	*/
	public function _filter_uri($str)
	{
	if ($str !== '' && $this->config->item('permitted_uri_chars') != '' && $this->config->item('enable_query_strings') === FALSE)
	{
	// preg_quote() in PHP 5.3 escapes -, so the str_replace() and addition of - to preg_quote() is to maintain backwards
	// compatibility as many are unaware of how characters in the permitted_uri_chars will be parsed as a regex pattern
	if ( ! preg_match('\|^['.str_replace(array('\\-', '\-'), '-', preg_quote($this->config->item('permitted_uri_chars'), '-')).']+$\|i', $str))
	{
	show_error('The URI you submitted has disallowed characters.', 400);
	}
	}

	// Convert programatic characters to entities and return
	return str_replace(
	array('$', '(', ')', '%28', '%29'), // Bad
	array('$', '(', ')', '(', ')'), // Good
	$str);
	}

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

	/**
	* Remove the suffix from the URL if needed
	*
	* Called by CI_Router
	*
	* @return void
	*/
	public function _remove_url_suffix()
	{
	if ($this->config->item('url_suffix') !== '')
	{
	$this->uri_string = preg_replace('\|'.preg_quote($this->config->item('url_suffix')).'$\|', '', $this->uri_string);
	}
	}

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

	/**
	* Explode the URI Segments. The individual segments will
	* be stored in the $this->segments array.
	*
	* Called by CI_Router
	*
	* @return void
	*/
	public function _explode_segments()
	{
	foreach (explode('/', preg_replace('\|/(.+?)/$\|', '\\1', $this->uri_string)) as $val)
	{
	// Filter segments for security
	$val = trim($this->_filter_uri($val));

	if ($val !== '')
	{
	$this->segments[] = $val;
	}
	}
	}

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

	/**
	* Re-index Segments
	*
	* This function re-indexes the $this->segment array so that it
	* starts at 1 rather than 0. Doing so makes it simpler to
	* use functions like $this->uri->segment(n) since there is
	* a 1:1 relationship between the segment array and the actual segments.
	*
	* Called by CI_Router
	*
	* @return void
	*/
	public function _reindex_segments()
	{
	array_unshift($this->segments, NULL);
	array_unshift($this->rsegments, NULL);
	unset($this->segments[0]);
	unset($this->rsegments[0]);
	}

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

	/**
	* Fetch a URI Segment
	*
	* This function returns the URI segment based on the number provided.
	*
	* @param int
	* @param mixed
	* @return string
	*/
	public function segment($n, $no_result = NULL)
	{
	return isset($this->segments[$n]) ? $this->segments[$n] : $no_result;
	}

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

	/**
	* Fetch a URI "routed" Segment
	*
	* This function returns the re-routed URI segment (assuming routing rules are used)
	* based on the number provided. If there is no routing this function returns the
	* same result as $this->segment()
	*
	* @param int
	* @param mixed
	* @return string
	*/
	public function rsegment($n, $no_result = NULL)
	{
	return isset($this->rsegments[$n]) ? $this->rsegments[$n] : $no_result;
	}

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

	/**
	* Generate a key value pair from the URI string
	*
	* This function generates and associative array of URI data starting
	* at the supplied segment. For example, if this is your URI:
	*
	* example.com/user/search/name/joe/location/UK/gender/male
	*
	* You can use this function to generate an array with this prototype:
	*
	* array (
	* name => joe
	* location => UK
	* gender => male
	* )
	*
	* @param int the starting segment number
	* @param array an array of default values
	* @return array
	*/
	public function uri_to_assoc($n = 3, $default = array())
	{
	return $this->_uri_to_assoc($n, $default, 'segment');
	}

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

	/**
	* Identical to above only it uses the re-routed segment array
	*
	* @param int the starting segment number
	* @param array an array of default values
	* @return array
	*/
	public function ruri_to_assoc($n = 3, $default = array())
	{
	return $this->_uri_to_assoc($n, $default, 'rsegment');
	}

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

	/**
	* Generate a key value pair from the URI string or Re-routed URI string
	*
	* @param int the starting segment number
	* @param array an array of default values
	* @param string which array we should use
	* @return array
	*/
	protected function _uri_to_assoc($n = 3, $default = array(), $which = 'segment')
	{
	if ( ! is_numeric($n))
	{
	return $default;
	}

	if (isset($this->keyval[$n]))
	{
	return $this->keyval[$n];
	}

	if ($which === 'segment')
	{
	$total_segments = 'total_segments';
	$segment_array = 'segment_array';
	}
	else
	{
	$total_segments = 'total_rsegments';
	$segment_array = 'rsegment_array';
	}

	if ($this->$total_segments() < $n)
	{
	return (count($default) === 0)
	? array()
	: array_fill_keys($default, NULL);
	}

	$segments = array_slice($this->$segment_array(), ($n - 1));
	$i = 0;
	$lastval = '';
	$retval = array();
	foreach ($segments as $seg)
	{
	if ($i % 2)
	{
	$retval[$lastval] = $seg;
	}
	else
	{
	$retval[$seg] = NULL;
	$lastval = $seg;
	}

	$i++;
	}

	if (count($default) > 0)
	{
	foreach ($default as $val)
	{
	if ( ! array_key_exists($val, $retval))
	{
	$retval[$val] = NULL;
	}
	}
	}

	// Cache the array for reuse
	$this->keyval[$n] = $retval;
	return $retval;
	}

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

	/**
	* Generate a URI string from an associative array
	*
	* @param array an associative array of key/values
	* @return array
	*/
	public function assoc_to_uri($array)
	{
	$temp = array();
	foreach ((array) $array as $key => $val)
	{
	$temp[] = $key;
	$temp[] = $val;
	}

	return implode('/', $temp);
	}

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

	/**
	* Fetch a URI Segment and add a trailing slash
	*
	* @param int
	* @param string
	* @return string
	*/
	public function slash_segment($n, $where = 'trailing')
	{
	return $this->_slash_segment($n, $where, 'segment');
	}

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

	/**
	* Fetch a URI Segment and add a trailing slash
	*
	* @param int
	* @param string
	* @return string
	*/
	public function slash_rsegment($n, $where = 'trailing')
	{
	return $this->_slash_segment($n, $where, 'rsegment');
	}

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

	/**
	* Fetch a URI Segment and add a trailing slash - helper function
	*
	* @param int
	* @param string
	* @param string
	* @return string
	*/
	protected function _slash_segment($n, $where = 'trailing', $which = 'segment')
	{
	$leading = $trailing = '/';

	if ($where === 'trailing')
	{
	$leading = '';
	}
	elseif ($where === 'leading')
	{
	$trailing = '';
	}

	return $leading.$this->$which($n).$trailing;
	}

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

	/**
	* Segment Array
	*
	* @return array
	*/
	public function segment_array()
	{
	return $this->segments;
	}

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

	/**
	* Routed Segment Array
	*
	* @return array
	*/
	public function rsegment_array()
	{
	return $this->rsegments;
	}

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

	/**
	* Total number of segments
	*
	* @return int
	*/
	public function total_segments()
	{
	return count($this->segments);
	}

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

	/**
	* Total number of routed segments
	*
	* @return int
	*/
	public function total_rsegments()
	{
	return count($this->rsegments);
	}

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

	/**
	* Fetch the entire URI string
	*
	* @return string
	*/
	public function uri_string()
	{
	return $this->uri_string;
	}


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

	/**
	* Fetch the entire Re-routed URI string
	*
	* @return string
	*/
	public function ruri_string()
	{
	return implode('/', $this->rsegment_array());
	}

	}

	/* End of file URI.php */
	/* Location: ./system/core/URI.php */