Merge CodeIgniter 3 support

1 files changed, 291 insertions, 316 deletions

diff --git a/system/helpers/url_helper.php b/system/helpers/url_helper.php
index 0e410d81c..84023affd 100644
--- a/system/helpers/url_helper.php
+++ b/system/helpers/url_helper.php
@@ -1,19 +1,41 @@
-<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+<?php
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP
  *
- * @package		CodeIgniter
- * @author		ExpressionEngine Dev Team
- * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc.
- * @license		http://codeigniter.com/user_guide/license.html
- * @link		http://codeigniter.com
- * @since		Version 1.0
+ * This content is released under the MIT License (MIT)
+ *
+ * Copyright (c) 2014 - 2017, British Columbia Institute of Technology
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @package	CodeIgniter
+ * @author	EllisLab Dev Team
+ * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
+ * @copyright	Copyright (c) 2014 - 2017, British Columbia Institute of Technology (http://bcit.ca/)
+ * @license	http://opensource.org/licenses/MIT	MIT License
+ * @link	https://codeigniter.com
+ * @since	Version 1.0.0
  * @filesource
  */
-
-// ------------------------------------------------------------------------
+defined('BASEPATH') OR exit('No direct script access allowed');
 
 /**
  * CodeIgniter URL Helpers
@@ -21,66 +43,63 @@
  * @package		CodeIgniter
  * @subpackage	Helpers
  * @category	Helpers
- * @author		ExpressionEngine Dev Team
- * @link		http://codeigniter.com/user_guide/helpers/url_helper.html
+ * @author		EllisLab Dev Team
+ * @link		https://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
- */
 if ( ! function_exists('site_url'))
 {
-	function site_url($uri = '')
+	/**
+	 * 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	$uri
+	 * @param	string	$protocol
+	 * @return	string
+	 */
+	function site_url($uri = '', $protocol = NULL)
 	{
-		$CI =& get_instance();
-		return $CI->config->site_url($uri);
+		return get_instance()->config->site_url($uri, $protocol);
 	}
 }
 
 // ------------------------------------------------------------------------
 
-/**
- * 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.
- *
- * @access	public
- * @param string
- * @return	string
- */
 if ( ! function_exists('base_url'))
 {
-	function base_url($uri = '')
+	/**
+	 * 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	$uri
+	 * @param	string	$protocol
+	 * @return	string
+	 */
+	function base_url($uri = '', $protocol = NULL)
 	{
-		$CI =& get_instance();
-		return $CI->config->base_url($uri);
+		return get_instance()->config->base_url($uri, $protocol);
 	}
 }
 
 // ------------------------------------------------------------------------
 
-/**
- * Current URL
- *
- * Returns the full URL (including segments) of the page where this
- * function is placed
- *
- * @access	public
- * @return	string
- */
 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();
@@ -89,78 +108,69 @@ if ( ! function_exists('current_url'))
 }
 
 // ------------------------------------------------------------------------
-/**
- * URL String
- *
- * Returns the URI segments.
- *
- * @access	public
- * @return	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();
+		return get_instance()->uri->uri_string();
 	}
 }
 
 // ------------------------------------------------------------------------
 
-/**
- * Index page
- *
- * Returns the "index_page" from your config file
- *
- * @access	public
- * @return	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');
+		return get_instance()->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
- */
 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', $uri)) ? site_url($uri) : $uri;
-		}
-		else
-		{
-			$site_url = site_url($uri);
-		}
+		$site_url = is_array($uri)
+			? site_url($uri)
+			: (preg_match('#^(\w+:)?//#i', $uri) ? $uri : site_url($uri));
 
-		if ($title == '')
+		if ($title === '')
 		{
 			$title = $site_url;
 		}
 
-		if ($attributes != '')
+		if ($attributes !== '')
 		{
-			$attributes = _parse_attributes($attributes);
+			$attributes = _stringify_attributes($attributes);
 		}
 
 		return '<a href="'.$site_url.'"'.$attributes.'>'.$title.'</a>';
@@ -169,139 +179,141 @@ if ( ! function_exists('anchor'))
 
 // ------------------------------------------------------------------------
 
-/**
- * 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
- */
 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);
 
-		$site_url = ( ! preg_match('!^\w+://! i', $uri)) ? site_url($uri) : $uri;
-
-		if ($title == '')
+		if ($title === '')
 		{
 			$title = $site_url;
 		}
 
 		if ($attributes === FALSE)
 		{
-			return "<a href='javascript:void(0);' onclick=\"window.open('".$site_url."', '_blank');\">".$title."</a>";
+			return '<a href="'.$site_url.'" onclick="window.open(\''.$site_url."', '_blank'); return false;\">".$title.'</a>';
 		}
 
 		if ( ! is_array($attributes))
 		{
-			$attributes = array();
-		}
+			$attributes = array($attributes);
 
-		foreach (array('width' => '800', 'height' => '600', 'scrollbars' => 'yes', 'status' => 'yes', 'resizable' => 'yes', 'screenx' => '0', 'screeny' => '0', ) as $key => $val)
+			// Ref: http://www.w3schools.com/jsref/met_win_open.asp
+			$window_name = '_blank';
+		}
+		elseif ( ! empty($attributes['window_name']))
 		{
-			$atts[$key] = ( ! isset($attributes[$key])) ? $val : $attributes[$key];
-			unset($attributes[$key]);
+			$window_name = $attributes['window_name'];
+			unset($attributes['window_name']);
+		}
+		else
+		{
+			$window_name = '_blank';
 		}
 
-		if ($attributes != '')
+		foreach (array('width' => '800', 'height' => '600', 'scrollbars' => 'yes', 'menubar' => 'no', 'status' => 'yes', 'resizable' => 'yes', 'screenx' => '0', 'screeny' => '0') as $key => $val)
 		{
-			$attributes = _parse_attributes($attributes);
+			$atts[$key] = isset($attributes[$key]) ? $attributes[$key] : $val;
+			unset($attributes[$key]);
 		}
 
-		return "<a href='javascript:void(0);' onclick=\"window.open('".$site_url."', '_blank', '"._parse_attributes($atts, TRUE)."');\"$attributes>".$title."</a>";
+		$attributes = _stringify_attributes($attributes);
+
+		return '<a href="'.$site_url
+			.'" onclick="window.open(\''.$site_url."', '".$window_name."', '"._stringify_attributes($atts, TRUE)."'); return false;\""
+			.$attributes.'>'.$title.'</a>';
 	}
 }
 
 // ------------------------------------------------------------------------
 
-/**
- * Mailto Link
- *
- * @access	public
- * @param	string	the email address
- * @param	string	the link title
- * @param	mixed	any attributes
- * @return	string
- */
 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 ($title == "")
+		if ($title === '')
 		{
 			$title = $email;
 		}
 
-		$attributes = _parse_attributes($attributes);
-
-		return '<a href="mailto:'.$email.'"'.$attributes.'>'.$title.'</a>';
+		return '<a href="mailto:'.$email.'"'._stringify_attributes($attributes).'>'.$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
- */
 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 ($title == "")
+		if ($title === '')
 		{
 			$title = $email;
 		}
 
-		for ($i = 0; $i < 16; $i++)
-		{
-			$x[] = substr('<a href="mailto:', $i, 1);
-		}
+		$x = str_split('<a href="mailto:', 1);
 
-		for ($i = 0; $i < strlen($email); $i++)
+		for ($i = 0, $l = strlen($email); $i < $l; $i++)
 		{
-			$x[] = "|".ord(substr($email, $i, 1));
+			$x[] = '|'.ord($email[$i]);
 		}
 
 		$x[] = '"';
 
-		if ($attributes != '')
+		if ($attributes !== '')
 		{
 			if (is_array($attributes))
 			{
 				foreach ($attributes as $key => $val)
 				{
-					$x[] =  ' '.$key.'="';
-					for ($i = 0; $i < strlen($val); $i++)
+					$x[] = ' '.$key.'="';
+					for ($i = 0, $l = strlen($val); $i < $l; $i++)
 					{
-						$x[] = "|".ord(substr($val, $i, 1));
+						$x[] = '|'.ord($val[$i]);
 					}
 					$x[] = '"';
 				}
 			}
 			else
 			{
-				for ($i = 0; $i < strlen($attributes); $i++)
+				for ($i = 0, $l = strlen($attributes); $i < $l; $i++)
 				{
-					$x[] = substr($attributes, $i, 1);
+					$x[] = $attributes[$i];
 				}
 			}
 		}
@@ -309,26 +321,28 @@ if ( ! function_exists('safe_mailto'))
 		$x[] = '>';
 
 		$temp = array();
-		for ($i = 0; $i < strlen($title); $i++)
+		for ($i = 0, $l = strlen($title); $i < $l; $i++)
 		{
 			$ordinal = ord($title[$i]);
 
 			if ($ordinal < 128)
 			{
-				$x[] = "|".$ordinal;
+				$x[] = '|'.$ordinal;
 			}
 			else
 			{
-				if (count($temp) == 0)
+				if (count($temp) === 0)
 				{
 					$count = ($ordinal < 224) ? 2 : 3;
 				}
 
 				$temp[] = $ordinal;
-				if (count($temp) == $count)
+				if (count($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;
+					$number = ($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();
 				}
@@ -338,89 +352,75 @@ if ( ! function_exists('safe_mailto'))
 		$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;
+
+		$output = "<script type=\"text/javascript\">\n"
+			."\t//<![CDATA[\n"
+			."\tvar l=new Array();\n";
+
+		for ($i = 0, $c = count($x); $i < $c; $i++)
+		{
+			$output .= "\tl[".$i."] = '".$x[$i]."';\n";
+		}
+
+		$output .= "\n\tfor (var i = l.length-1; i >= 0; i=i-1) {\n"
+			."\t\tif (l[i].substring(0, 1) === '|') document.write(\"&#\"+unescape(l[i].substring(1))+\";\");\n"
+			."\t\telse document.write(unescape(l[i]));\n"
+			."\t}\n"
+			."\t//]]>\n"
+			.'</script>';
+
+		return $output;
 	}
 }
 
 // ------------------------------------------------------------------------
 
-/**
- * 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
- */
 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')
+		// Find and replace any URLs.
+		if ($type !== 'email' && preg_match_all('#(\w*://|www\.)[^\s()<>;]+\w#i', $str, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER))
 		{
-			if (preg_match_all("#(^|\s|\()((http(s?)://)|(www\.))(\w+[^\s\)\<]+)#i", $str, $matches))
-			{
-				$pop = ($popup == TRUE) ? " target=\"_blank\" " : "";
-
-				for ($i = 0; $i < count($matches['0']); $i++)
-				{
-					$period = '';
-					if (preg_match("|\.$|", $matches['6'][$i]))
-					{
-						$period = '.';
-						$matches['6'][$i] = substr($matches['6'][$i], 0, -1);
-					}
+			// Set our target HTML if using popup links.
+			$target = ($popup) ? ' target="_blank"' : '';
 
-					$str = str_replace($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, $str);
-				}
+			// We process the links in reverse order (last -> first) so that
+			// the returned string offsets from preg_match_all() are not
+			// moved as we add more HTML.
+			foreach (array_reverse($matches) as $match)
+			{
+				// $match[0] is the matched string/link
+				// $match[1] is either a protocol prefix or 'www.'
+				//
+				// With PREG_OFFSET_CAPTURE, both of the above is an array,
+				// where the actual value is held in [0] and its offset at the [1] index.
+				$a = '<a href="'.(strpos($match[1][0], '/') ? '' : 'http://').$match[0][0].'"'.$target.'>'.$match[0][0].'</a>';
+				$str = substr_replace($str, $a, $match[0][1], strlen($match[0][0]));
 			}
 		}
 
-		if ($type != 'url')
+		// Find and replace any emails.
+		if ($type !== 'url' && preg_match_all('#([\w\.\-\+]+@[a-z0-9\-]+\.[a-z0-9\-\.]+[^[:punct:]\s])#i', $str, $matches, PREG_OFFSET_CAPTURE))
 		{
-			if (preg_match_all("/([a-zA-Z0-9_\.\-\+]+)@([a-zA-Z0-9\-]+)\.([a-zA-Z0-9\-\.]*)/i", $str, $matches))
+			foreach (array_reverse($matches[0]) as $match)
 			{
-				for ($i = 0; $i < count($matches['0']); $i++)
+				if (filter_var($match[0], FILTER_VALIDATE_EMAIL) !== FALSE)
 				{
-					$period = '';
-					if (preg_match("|\.$|", $matches['3'][$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);
+					$str = substr_replace($str, safe_mailto($match[0]), $match[1], strlen($match[0]));
 				}
 			}
 		}
@@ -431,20 +431,19 @@ if ( ! function_exists('auto_link'))
 
 // ------------------------------------------------------------------------
 
-/**
- * Prep URL
- *
- * Simply adds the http:// part if no scheme is included
- *
- * @access	public
- * @param	string	the URL
- * @return	string
- */
 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 $str == '')
+		if ($str === 'http://' OR $str === '')
 		{
 			return '';
 		}
@@ -453,7 +452,7 @@ if ( ! function_exists('prep_url'))
 
 		if ( ! $url OR ! isset($url['scheme']))
 		{
-			$str = 'http://'.$str;
+			return 'http://'.$str;
 		}
 
 		return $str;
@@ -462,45 +461,46 @@ if ( ! function_exists('prep_url'))
 
 // ------------------------------------------------------------------------
 
-/**
- * Create URL Title
- *
- * Takes a "title" string as input and creates a
- * human-friendly URL string with a "separator" string 
- * as the word separator.
- *
- * @access	public
- * @param	string	the string
- * @param	string	the separator
- * @return	string
- */
 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.
+	 *
+	 * @todo	Remove old 'dash' and 'underscore' usage in 3.1+.
+	 * @param	string	$str		Input string
+	 * @param	string	$separator	Word separator
+	 *			(usually '-' or '_')
+	 * @param	bool	$lowercase	Whether to transform the output string to lowercase
+	 * @return	string
+	 */
 	function url_title($str, $separator = '-', $lowercase = FALSE)
 	{
-		if ($separator == 'dash') 
+		if ($separator === 'dash')
 		{
-		    $separator = '-';
+			$separator = '-';
 		}
-		else if ($separator == 'underscore')
+		elseif ($separator === 'underscore')
 		{
-		    $separator = '_';
+			$separator = '_';
 		}
-		
-		$q_separator = preg_quote($separator);
+
+		$q_separator = preg_quote($separator, '#');
 
 		$trans = array(
-			'&.+?;'                 => '',
-			'[^a-z0-9 _-]'          => '',
-			'\s+'                   => $separator,
-			'('.$q_separator.')+'   => $separator
+			'&.+?;'			=> '',
+			'[^\w\d _-]'		=> '',
+			'\s+'			=> $separator,
+			'('.$q_separator.')+'	=> $separator
 		);
 
 		$str = strip_tags($str);
-
 		foreach ($trans as $key => $val)
 		{
-			$str = preg_replace("#".$key."#i", $val, $str);
+			$str = preg_replace('#'.$key.'#i'.(UTF8_ENABLED ? 'u' : ''), $val, $str);
 		}
 
 		if ($lowercase === TRUE)
@@ -508,87 +508,62 @@ if ( ! function_exists('url_title'))
 			$str = strtolower($str);
 		}
 
-		return trim($str, $separator);
+		return trim(trim($str, $separator));
 	}
 }
 
 // ------------------------------------------------------------------------
 
-/**
- * Header Redirect
- *
- * Header redirect in two flavors
- * For very fine grained control over headers, you could use the Output
- * Library's set_header() function.
- *
- * @access	public
- * @param	string	the URL
- * @param	string	the method: location or redirect
- * @return	string
- */
 if ( ! function_exists('redirect'))
 {
-	function redirect($uri = '', $method = 'location', $http_response_code = 302)
+	/**
+	 * 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	$uri	URL
+	 * @param	string	$method	Redirect method
+	 *			'auto', 'location' or 'refresh'
+	 * @param	int	$code	HTTP Response status code
+	 * @return	void
+	 */
+	function redirect($uri = '', $method = 'auto', $code = NULL)
 	{
-		if ( ! preg_match('#^https?://#i', $uri))
+		if ( ! preg_match('#^(\w+:)?//#i', $uri))
 		{
 			$uri = site_url($uri);
 		}
 
-		switch($method)
-		{
-			case 'refresh'	: header("Refresh:0;url=".$uri);
-				break;
-			default			: header("Location: ".$uri, TRUE, $http_response_code);
-				break;
-		}
-		exit;
-	}
-}
-
-// ------------------------------------------------------------------------
-
-/**
- * Parse out the attributes
- *
- * Some of the functions use this
- *
- * @access	private
- * @param	array
- * @param	bool
- * @return	string
- */
-if ( ! function_exists('_parse_attributes'))
-{
-	function _parse_attributes($attributes, $javascript = FALSE)
-	{
-		if (is_string($attributes))
+		// IIS environment likely? Use 'refresh' for better compatibility
+		if ($method === 'auto' && isset($_SERVER['SERVER_SOFTWARE']) && strpos($_SERVER['SERVER_SOFTWARE'], 'Microsoft-IIS') !== FALSE)
 		{
-			return ($attributes != '') ? ' '.$attributes : '';
+			$method = 'refresh';
 		}
-
-		$att = '';
-		foreach ($attributes as $key => $val)
+		elseif ($method !== 'refresh' && (empty($code) OR ! is_numeric($code)))
 		{
-			if ($javascript == TRUE)
+			if (isset($_SERVER['SERVER_PROTOCOL'], $_SERVER['REQUEST_METHOD']) && $_SERVER['SERVER_PROTOCOL'] === 'HTTP/1.1')
 			{
-				$att .= $key . '=' . $val . ',';
+				$code = ($_SERVER['REQUEST_METHOD'] !== 'GET')
+					? 303	// reference: http://en.wikipedia.org/wiki/Post/Redirect/Get
+					: 307;
 			}
 			else
 			{
-				$att .= ' ' . $key . '="' . $val . '"';
+				$code = 302;
 			}
 		}
 
-		if ($javascript == TRUE AND $att != '')
+		switch ($method)
 		{
-			$att = substr($att, 0, -1);
+			case 'refresh':
+				header('Refresh:0;url='.$uri);
+				break;
+			default:
+				header('Location: '.$uri, TRUE, $code);
+				break;
 		}
-
-		return $att;
+		exit;
 	}
 }
-
-
-/* End of file url_helper.php */
-/* Location: ./system/helpers/url_helper.php */
\ No newline at end of file