CI_Output Class Reference

List of all members.

Public Member Functions
	CI_Output ()
	get_output ()
	Get Output.
	set_output ($output)
	Set Output.
	append_output ($output)
	Append Output.
	set_header ($header)
	Set Header.
	enable_profiler ($val=TRUE)
	Enable/disable Profiler.
	cache ($time)
	Set Cache.
	_display ($output= '')
	Display Output.
	_write_cache ($output)
	Write a Cache File.
	_display_cache (&$CFG, &$URI)
	Update/serve a cached file.
Public Attributes
	$final_output
	$cache_expiration = 0
	$headers = array()
	$enable_profiler = FALSE

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Detailed Description

Definition at line 29 of file Output.php.

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Member Function Documentation

CI_Output::_display

(

$

output = ''

)

Display Output.

All "view" data is automatically put into this variable by the controller class:

$this->final_output

This function sends the finalized output data to the browser along with any server headers and profile data. It also stops the benchmark timer so the page rendering speed and memory usage can be shown.

public

Returns:

mixed

Definition at line 159 of file Output.php.

References $BM, $CFG, $CI, _write_cache(), enable_profiler(), get_instance(), and log_message().

Referenced by _display_cache().

        {       
                // Note:  We use globals because we can't use $CI =& get_instance()
                // since this function is sometimes called by the caching mechanism,
                // which happens before the CI super object is available.
                global $BM, $CFG;
                
                // --------------------------------------------------------------------
                
                // Set the output data
                if ($output == '')
                {
                        $output =& $this->final_output;
                }
                
                // --------------------------------------------------------------------
                
                // Do we need to write a cache file?
                if ($this->cache_expiration > 0)
                {
                        $this->_write_cache($output);
                }
                
                // --------------------------------------------------------------------

                // Parse out the elapsed time and memory usage,
                // then swap the pseudo-variables with the data
                                
                $elapsed = $BM->elapsed_time('total_execution_time_start', 'total_execution_time_end');         
                $output = str_replace('{elapsed_time}', $elapsed, $output);
                
                $memory  = ( ! function_exists('memory_get_usage')) ? '0' : round(memory_get_usage()/1024/1024, 2).'MB';
                $output = str_replace('{memory_usage}', $memory, $output);              

                // --------------------------------------------------------------------
                
                // Is compression requested?
                if ($CFG->item('compress_output') === TRUE)
                {
                        if (extension_loaded('zlib'))
                        {
                                if (isset($_SERVER['HTTP_ACCEPT_ENCODING']) AND strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== FALSE)
                                {
                                        ob_start('ob_gzhandler');
                                }
                        }
                }

                // --------------------------------------------------------------------
                
                // Are there any server headers to send?
                if (count($this->headers) > 0)
                {
                        foreach ($this->headers as $header)
                        {
                                @header($header);
                        }
                }               

                // --------------------------------------------------------------------
                
                // Does the get_instance() function exist?
                // If not we know we are dealing with a cache file so we'll
                // simply echo out the data and exit.
                if ( ! function_exists('get_instance'))
                {
                        echo $output;
                        log_message('debug', "Final output sent to browser");
                        log_message('debug', "Total execution time: ".$elapsed);
                        return TRUE;
                }
        
                // --------------------------------------------------------------------

                // Grab the super object.  We'll need it in a moment...
                $CI =& get_instance();
                
                // Do we need to generate profile data?
                // If so, load the Profile class and run it.
                if ($this->enable_profiler == TRUE)
                {
                        $CI->load->library('profiler');                         
                                                                                
                        // If the output data contains closing </body> and </html> tags
                        // we will remove them and add them back after we insert the profile data
                        if (preg_match("|</body>.*?</html>|is", $output))
                        {
                                $output  = preg_replace("|</body>.*?</html>|is", '', $output);
                                $output .= $CI->profiler->run();
                                $output .= '</body></html>';
                        }
                        else
                        {
                                $output .= $CI->profiler->run();
                        }
                }
                
                // --------------------------------------------------------------------

                // Does the controller contain a function named _output()?
                // If so send the output there.  Otherwise, echo it.
                if (method_exists($CI, '_output'))
                {
                        $CI->_output($output);
                }
                else
                {
                        echo $output;  // Send it to the browser!
                }
                
                log_message('debug', "Final output sent to browser");
                log_message('debug', "Total execution time: ".$elapsed);                
        }

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CI_Output::_display_cache	(	&$	CFG,
		&$	URI
	)

Update/serve a cached file.

public

Returns:

void

Definition at line 324 of file Output.php.

References $CFG, $URI, _display(), is_really_writable(), and log_message().

        {
                $cache_path = ($CFG->item('cache_path') == '') ? BASEPATH.'cache/' : $CFG->item('cache_path');
                        
                if ( ! is_dir($cache_path) OR ! is_really_writable($cache_path))
                {
                        return FALSE;
                }
                
                // Build the file path.  The file name is an MD5 hash of the full URI
                $uri =  $CFG->item('base_url').
                                $CFG->item('index_page').
                                $URI->uri_string;
                                
                $filepath = $cache_path.md5($uri);
                
                if ( ! @file_exists($filepath))
                {
                        return FALSE;
                }
        
                if ( ! $fp = @fopen($filepath, 'rb'))
                {
                        return FALSE;
                }
                        
                flock($fp, LOCK_SH);
                
                $cache = '';
                if (filesize($filepath) > 0)
                {
                        $cache = fread($fp, filesize($filepath));
                }
        
                flock($fp, LOCK_UN);
                fclose($fp);
                                        
                // Strip out the embedded timestamp             
                if ( ! preg_match("/(\d+TS--->)/", $cache, $match))
                {
                        return FALSE;
                }
                
                // Has the file expired? If so we'll delete it.
                if (time() >= trim(str_replace('TS--->', '', $match['1'])))
                {               
                        @unlink($filepath);
                        log_message('debug', "Cache file has expired. File deleted");
                        return FALSE;
                }

                // Display the cache
                $this->_display(str_replace($match['0'], '', $cache));
                log_message('debug', "Cache file is current. Sending it to browser.");          
                return TRUE;
        }

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CI_Output::_write_cache

(

$

output

)

Write a Cache File.

public

Returns:

void

Definition at line 281 of file Output.php.

References $CI, get_instance(), is_really_writable(), and log_message().

Referenced by _display().

        {
                $CI =& get_instance();  
                $path = $CI->config->item('cache_path');
        
                $cache_path = ($path == '') ? BASEPATH.'cache/' : $path;
                
                if ( ! is_dir($cache_path) OR ! is_really_writable($cache_path))
                {
                        return;
                }
                
                $uri =  $CI->config->item('base_url').
                                $CI->config->item('index_page').
                                $CI->uri->uri_string();
                
                $cache_path .= md5($uri);

                if ( ! $fp = @fopen($cache_path, 'wb'))
                {
                        log_message('error', "Unable to write cache file: ".$cache_path);
                        return;
                }
                
                $expire = time() + ($this->cache_expiration * 60);
                
                flock($fp, LOCK_EX);
                fwrite($fp, $expire.'TS--->'.$output);
                flock($fp, LOCK_UN);
                fclose($fp);
                @chmod($cache_path, DIR_WRITE_MODE);

                log_message('debug', "Cache file written: ".$cache_path);
        }

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CI_Output::append_output

(

$

output

)

Append Output.

Appends data onto the output string

public

Parameters:

string

Returns:

void

Definition at line 84 of file Output.php.

        {
                if ($this->final_output == '')
                {
                        $this->final_output = $output;
                }
                else
                {
                        $this->final_output .= $output;
                }
        }

CI_Output::cache

(

$

time

)

Set Cache.

public

Parameters:

integer

Returns:

void

Definition at line 138 of file Output.php.

        {
                $this->cache_expiration = ( ! is_numeric($time)) ? 0 : $time;
        }

CI_Output::CI_Output

(

)

Definition at line 37 of file Output.php.

References log_message().

        {
                log_message('debug', "Output Class Initialized");
        }

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CI_Output::enable_profiler

(

$

val = TRUE

)

Enable/disable Profiler.

public

Parameters:

bool

Returns:

void

Definition at line 124 of file Output.php.

Referenced by _display().

        {
                $this->enable_profiler = (is_bool($val)) ? $val : TRUE;
        }

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CI_Output::get_output

(

)

Get Output.

Returns the current output string

public

Returns:

string

Definition at line 52 of file Output.php.

        {
                return $this->final_output;
        }

CI_Output::set_header

(

$

header

)

Set Header.

Lets you set a server header which will be outputted with the final display.

Note: If a file is cached, headers will not be sent. We need to figure out how to permit header data to be saved with the cache data...

public

Parameters:

string

Returns:

void

Definition at line 110 of file Output.php.

        {
                $this->headers[] = $header;
        }

CI_Output::set_output

(

$

output

)

Set Output.

Sets the output string

public

Parameters:

string

Returns:

void

Definition at line 68 of file Output.php.

        {
                $this->final_output = $output;
        }

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Member Data Documentation

CI_Output::$cache_expiration = 0

Definition at line 32 of file Output.php.

CI_Output::$enable_profiler = FALSE

Definition at line 34 of file Output.php.

CI_Output::$final_output

Definition at line 31 of file Output.php.

CI_Output::$headers = array()

Definition at line 33 of file Output.php.

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The documentation for this class was generated from the following file:

• Output.php