Added get_header method to Output class.

system/core/Output.php

@@ -44,49 +44,49 @@ class CI_Output {
 	 * @var string
 	 */
 	public $final_output;
-	
+
 	/**
 	 * Cache expiration time
 	 *
 	 * @var int
 	 */
 	public $cache_expiration =	0;
-	
+
 	/**
 	 * List of server headers
 	 *
 	 * @var array
 	 */
 	public $headers =	array();
-	
+
 	/**
 	 * List of mime types
 	 *
 	 * @var array
 	 */
 	public $mime_types =	array();
-	
+
 	/**
 	 * Determines wether profiler is enabled
 	 *
 	 * @var book
 	 */
 	public $enable_profiler =	FALSE;
-	
+
 	/**
 	 * Determines if output compression is enabled
 	 *
 	 * @var bool
 	 */
 	protected $_zlib_oc =	FALSE;
-	
+
 	/**
 	 * List of profiler sections
 	 *
 	 * @var array
 	 */
 	protected $_profiler_sections =	array();
-	
+
 	/**
 	 * Whether or not to parse variables like {elapsed_time} and {memory_usage}
 	 *
@@ -172,6 +172,69 @@ public function append_output($output)
 
 	// --------------------------------------------------------------------
 
+	/**
+	 * Get Header
+	 *
+	 * Retrieve an individual header or an array of headers that have
+	 * already been sent via Output class or header() function.
+	 *
+	 * For an individual header, the value is returned. For an array
+	 * of headers, a key-value array is returned.
+	 *
+	 * @param	string
+	 * @return	array
+	 */
+	public function get_header($header = NULL)
+	{
+		$headers = array();
+
+		// Get headers that have already been sent
+		$sent_headers = headers_list();
+		if ( ! empty($sent_headers))
+		{
+			foreach ($sent_headers as $sent_header)
+			{
+				$header_array = explode(':', $sent_header);
+				$field = trim($header_array[0]);
+				$value = trim($header_array[1]);
+				$headers[$field] = $value;
+			}
+		}
+
+		// Get headers set via the Output class
+		$output_headers = $this->headers;
+		if ( ! empty($output_headers))
+		{
+			foreach ($output_headers as $output_header)
+			{
+				$header_array = explode(':', $output_header[0]);
+				$field = trim($header_array[0]);
+				$value = trim($header_array[1]);
+
+				// Add new or replace existing when specified
+				if ( ! isset($headers[$field]) || $output_header[1])
+				{
+					$headers[$field] = $value;
+				}
+			}
+		}
+
+		if ( ! empty($headers) && empty($header))
+		{
+			return $headers;
+		}
+		elseif (isset($headers[$header]))
+		{
+			return $headers[$header];
+		}
+		else
+		{
+			return FALSE;
+		}
+	}
+
+	// --------------------------------------------------------------------
+
 	/**
 	 * Set Header
 	 *
@@ -548,4 +611,4 @@ public function _display_cache(&$CFG, &$URI)
 }
 
 /* End of file Output.php */
-/* Location: ./system/core/Output.php */
+/* Location: ./system/core/Output.php */

user_guide_src/source/changelog.rst

@@ -55,7 +55,7 @@ Release Date: Not Released
 
 -  Database
 
-   -  Renamed the Active Record class to Query Builder to remove confusion with 
+   -  Renamed the Active Record class to Query Builder to remove confusion with
       the Active Record design pattern
    -  Added new :doc:`Query Builder <database/query_builder>` methods that return
    -  Added the ability to insert objects with insert_batch() in :doc:`Query Builder <database/query_builder>`.
@@ -146,6 +146,7 @@ Release Date: Not Released
    -  Added support for HTTP-Only cookies with new config option ``cookie_httponly`` (default FALSE).
    -  Renamed method _call_hook() to call_hook() in the :doc:`Hooks Library <general/hooks>`.
    -  Added get_content_type() method to the :doc:`Output Library <libraries/output>`.
+   -  Added get_header() method to the :doc:`Output Library <libraries/output>`.
 
 Bug fixes for 3.0
 ------------------

user_guide_src/source/libraries/output.rst

@@ -77,6 +77,14 @@ Appends data onto the output string. Usage example::
 
 	$this->output->append_output($data);
 
+$this->output->get_header();
+=============================
+
+Retrieves headers that have been set by the Output class, or by using
+the traditional header() function. Example::
+
+	$this->output->get_header('Content-Type');
+
 $this->output->set_header();
 =============================