system/core/Output.php
.htaccess
AesEncryption.php
LICENSE
application
.htaccess
cache
index.html
config
autoload.php
config.php
constants.php
database.php
doctypes.php
foreign_chars.php
hooks.php
index.html
memcached.php
migration.php
mimes.php
profiler.php
routes.php
smileys.php
user_agents.php
controllers
Systemid.php
Welcome.php
index.html
core
index.html
helpers
index.html
hooks
index.html
index.html
language
english
index.html
system_lang.php
index.html
libraries
index.html
logs
index.html
models
System_model.php
index.html
third_party
index.html
views
about.php
category
addedit.php
addeditsub.php
components.php
delete.php
errors
cli
error_404.php
error_db.php
error_exception.php
error_general.php
error_php.php
index.html
html
error_404.php
error_db.php
error_exception.php
error_general.php
error_php.php
index.html
index.html
foot.php
generator.php
head.php
index.html
login.php
main.php
pass
addedit.php
show.php
welcome_message.php
captcha
sys.txt
favicon.ico
index.php
install.php
library
AesEncryption.php
bootstrap
css
.DS_Store
bootstrap-grid.css
bootstrap-grid.css.map
bootstrap-grid.min.css
bootstrap-grid.min.css.map
bootstrap-reboot.css
bootstrap-reboot.css.map
bootstrap-reboot.min.css
bootstrap-reboot.min.css.map
bootstrap.css
bootstrap.css.map
bootstrap.min.css
bootstrap.min.css.map
js
bootstrap.bundle.js
bootstrap.bundle.js.map
bootstrap.bundle.min.js
bootstrap.bundle.min.js.map
bootstrap.js
bootstrap.js.map
bootstrap.min.js
bootstrap.min.js.map
font-awesome
HELP-US-OUT.txt
css
font-awesome.css
font-awesome.min.css
fonts
FontAwesome.otf
fontawesome-webfont.eot
fontawesome-webfont.svg
fontawesome-webfont.ttf
fontawesome-webfont.woff
fontawesome-webfont.woff2
less
animated.less
bordered-pulled.less
core.less
fixed-width.less
font-awesome.less
icons.less
larger.less
list.less
mixins.less
path.less
rotated-flipped.less
screen-reader.less
stacked.less
variables.less
scss
_animated.scss
_bordered-pulled.scss
_core.scss
_fixed-width.scss
_icons.scss
_larger.scss
_list.scss
_mixins.scss
_path.scss
_rotated-flipped.scss
_screen-reader.scss
_stacked.scss
_variables.scss
font-awesome.scss
font-awesome.min.css
jquery-ui
AUTHORS.txt
LICENSE.txt
external
jquery
jquery.js
images
ui-icons_444444_256x240.png
ui-icons_555555_256x240.png
ui-icons_777620_256x240.png
ui-icons_777777_256x240.png
ui-icons_cc0000_256x240.png
ui-icons_ffffff_256x240.png
index.html
jquery-ui.css
jquery-ui.js
jquery-ui.min.css
jquery-ui.min.js
jquery-ui.structure.css
jquery-ui.structure.min.css
jquery-ui.theme.css
jquery-ui.theme.min.css
package.json
jquery.min.js
jquerysctipttop.css
logo.png
password_indicator_bs4
css
signin.css
index.html
js
jaktutorial.js
popper.min.js
right-click
css
contextMenu.min.css
js
contextMenu.min.js
style.css
tether
css
tether-theme-arrows-dark.css
tether-theme-arrows-dark.min.css
tether-theme-arrows.css
tether-theme-arrows.min.css
tether-theme-basic.css
tether-theme-basic.min.css
tether.css
tether.min.css
js
tether.js
tether.min.js
system
.htaccess
core
Benchmark.php
CodeIgniter.php
Common.php
Config.php
Controller.php
Exceptions.php
Hooks.php
Input.php
Lang.php
Loader.php
Log.php
Model.php
Output.php
Router.php
Security.php
URI.php
Utf8.php
compat
hash.php
index.html
mbstring.php
password.php
standard.php
index.html
database
DB.php
DB_cache.php
DB_driver.php
DB_forge.php
DB_query_builder.php
DB_result.php
DB_utility.php
drivers
cubrid
cubrid_driver.php
cubrid_forge.php
cubrid_result.php
cubrid_utility.php
index.html
ibase
ibase_driver.php
ibase_forge.php
ibase_result.php
ibase_utility.php
index.html
index.html
mssql
index.html
mssql_driver.php
mssql_forge.php
mssql_result.php
mssql_utility.php
mysql
index.html
mysql_driver.php
mysql_forge.php
mysql_result.php
mysql_utility.php
mysqli
index.html
mysqli_driver.php
mysqli_forge.php
mysqli_result.php
mysqli_utility.php
oci8
index.html
oci8_driver.php
oci8_forge.php
oci8_result.php
oci8_utility.php
odbc
index.html
odbc_driver.php
odbc_forge.php
odbc_result.php
odbc_utility.php
pdo
index.html
pdo_driver.php
pdo_forge.php
pdo_result.php
pdo_utility.php
subdrivers
index.html
pdo_4d_driver.php
pdo_4d_forge.php
pdo_cubrid_driver.php
pdo_cubrid_forge.php
pdo_dblib_driver.php
pdo_dblib_forge.php
pdo_firebird_driver.php
pdo_firebird_forge.php
pdo_ibm_driver.php
pdo_ibm_forge.php
pdo_informix_driver.php
pdo_informix_forge.php
pdo_mysql_driver.php
pdo_mysql_forge.php
pdo_oci_driver.php
pdo_oci_forge.php
pdo_odbc_driver.php
pdo_odbc_forge.php
pdo_pgsql_driver.php
pdo_pgsql_forge.php
pdo_sqlite_driver.php
pdo_sqlite_forge.php
pdo_sqlsrv_driver.php
pdo_sqlsrv_forge.php
postgre
index.html
postgre_driver.php
postgre_forge.php
postgre_result.php
postgre_utility.php
sqlite
index.html
sqlite_driver.php
sqlite_forge.php
sqlite_result.php
sqlite_utility.php
sqlite3
index.html
sqlite3_driver.php
sqlite3_forge.php
sqlite3_result.php
sqlite3_utility.php
sqlsrv
index.html
sqlsrv_driver.php
sqlsrv_forge.php
sqlsrv_result.php
sqlsrv_utility.php
index.html
fonts
index.html
texb.ttf
helpers
array_helper.php
captcha_helper.php
cookie_helper.php
date_helper.php
directory_helper.php
download_helper.php
email_helper.php
file_helper.php
form_helper.php
html_helper.php
index.html
inflector_helper.php
language_helper.php
number_helper.php
path_helper.php
security_helper.php
smiley_helper.php
string_helper.php
text_helper.php
typography_helper.php
url_helper.php
xml_helper.php
index.html
language
english
calendar_lang.php
date_lang.php
db_lang.php
email_lang.php
form_validation_lang.php
ftp_lang.php
imglib_lang.php
index.html
migration_lang.php
number_lang.php
pagination_lang.php
profiler_lang.php
unit_test_lang.php
upload_lang.php
index.html
libraries
Cache
Cache.php
drivers
Cache_apc.php
Cache_dummy.php
Cache_file.php
Cache_memcached.php
Cache_redis.php
Cache_wincache.php
index.html
index.html
Calendar.php
Cart.php
Driver.php
Email.php
Encrypt.php
Encryption.php
Form_validation.php
Ftp.php
Image_lib.php
Javascript
Jquery.php
index.html
Javascript.php
Migration.php
Pagination.php
Parser.php
Profiler.php
Session
Session.php
SessionHandlerInterface.php
Session_driver.php
drivers
Session_database_driver.php
Session_files_driver.php
Session_memcached_driver.php
Session_redis_driver.php
index.html
index.html
Table.php
Trackback.php
Typography.php
Unit_test.php
Upload.php
User_agent.php
Xmlrpc.php
Xmlrpcs.php
Zip.php
index.html
AesEncryption.php
LICENSE
application
.htaccess
cache
index.html
config
autoload.php
config.php
constants.php
database.php
doctypes.php
foreign_chars.php
hooks.php
index.html
memcached.php
migration.php
mimes.php
profiler.php
routes.php
smileys.php
user_agents.php
controllers
Systemid.php
Welcome.php
index.html
core
index.html
helpers
index.html
hooks
index.html
index.html
language
english
index.html
system_lang.php
index.html
libraries
index.html
logs
index.html
models
System_model.php
index.html
third_party
index.html
views
about.php
category
addedit.php
addeditsub.php
components.php
delete.php
errors
cli
error_404.php
error_db.php
error_exception.php
error_general.php
error_php.php
index.html
html
error_404.php
error_db.php
error_exception.php
error_general.php
error_php.php
index.html
index.html
foot.php
generator.php
head.php
index.html
login.php
main.php
pass
addedit.php
show.php
welcome_message.php
captcha
sys.txt
favicon.ico
index.php
install.php
library
AesEncryption.php
bootstrap
css
.DS_Store
bootstrap-grid.css
bootstrap-grid.css.map
bootstrap-grid.min.css
bootstrap-grid.min.css.map
bootstrap-reboot.css
bootstrap-reboot.css.map
bootstrap-reboot.min.css
bootstrap-reboot.min.css.map
bootstrap.css
bootstrap.css.map
bootstrap.min.css
bootstrap.min.css.map
js
bootstrap.bundle.js
bootstrap.bundle.js.map
bootstrap.bundle.min.js
bootstrap.bundle.min.js.map
bootstrap.js
bootstrap.js.map
bootstrap.min.js
bootstrap.min.js.map
font-awesome
HELP-US-OUT.txt
css
font-awesome.css
font-awesome.min.css
fonts
FontAwesome.otf
fontawesome-webfont.eot
fontawesome-webfont.svg
fontawesome-webfont.ttf
fontawesome-webfont.woff
fontawesome-webfont.woff2
less
animated.less
bordered-pulled.less
core.less
fixed-width.less
font-awesome.less
icons.less
larger.less
list.less
mixins.less
path.less
rotated-flipped.less
screen-reader.less
stacked.less
variables.less
scss
_animated.scss
_bordered-pulled.scss
_core.scss
_fixed-width.scss
_icons.scss
_larger.scss
_list.scss
_mixins.scss
_path.scss
_rotated-flipped.scss
_screen-reader.scss
_stacked.scss
_variables.scss
font-awesome.scss
font-awesome.min.css
jquery-ui
AUTHORS.txt
LICENSE.txt
external
jquery
jquery.js
images
ui-icons_444444_256x240.png
ui-icons_555555_256x240.png
ui-icons_777620_256x240.png
ui-icons_777777_256x240.png
ui-icons_cc0000_256x240.png
ui-icons_ffffff_256x240.png
index.html
jquery-ui.css
jquery-ui.js
jquery-ui.min.css
jquery-ui.min.js
jquery-ui.structure.css
jquery-ui.structure.min.css
jquery-ui.theme.css
jquery-ui.theme.min.css
package.json
jquery.min.js
jquerysctipttop.css
logo.png
password_indicator_bs4
css
signin.css
index.html
js
jaktutorial.js
popper.min.js
right-click
css
contextMenu.min.css
js
contextMenu.min.js
style.css
tether
css
tether-theme-arrows-dark.css
tether-theme-arrows-dark.min.css
tether-theme-arrows.css
tether-theme-arrows.min.css
tether-theme-basic.css
tether-theme-basic.min.css
tether.css
tether.min.css
js
tether.js
tether.min.js
system
.htaccess
core
Benchmark.php
CodeIgniter.php
Common.php
Config.php
Controller.php
Exceptions.php
Hooks.php
Input.php
Lang.php
Loader.php
Log.php
Model.php
Output.php
Router.php
Security.php
URI.php
Utf8.php
compat
hash.php
index.html
mbstring.php
password.php
standard.php
index.html
database
DB.php
DB_cache.php
DB_driver.php
DB_forge.php
DB_query_builder.php
DB_result.php
DB_utility.php
drivers
cubrid
cubrid_driver.php
cubrid_forge.php
cubrid_result.php
cubrid_utility.php
index.html
ibase
ibase_driver.php
ibase_forge.php
ibase_result.php
ibase_utility.php
index.html
index.html
mssql
index.html
mssql_driver.php
mssql_forge.php
mssql_result.php
mssql_utility.php
mysql
index.html
mysql_driver.php
mysql_forge.php
mysql_result.php
mysql_utility.php
mysqli
index.html
mysqli_driver.php
mysqli_forge.php
mysqli_result.php
mysqli_utility.php
oci8
index.html
oci8_driver.php
oci8_forge.php
oci8_result.php
oci8_utility.php
odbc
index.html
odbc_driver.php
odbc_forge.php
odbc_result.php
odbc_utility.php
pdo
index.html
pdo_driver.php
pdo_forge.php
pdo_result.php
pdo_utility.php
subdrivers
index.html
pdo_4d_driver.php
pdo_4d_forge.php
pdo_cubrid_driver.php
pdo_cubrid_forge.php
pdo_dblib_driver.php
pdo_dblib_forge.php
pdo_firebird_driver.php
pdo_firebird_forge.php
pdo_ibm_driver.php
pdo_ibm_forge.php
pdo_informix_driver.php
pdo_informix_forge.php
pdo_mysql_driver.php
pdo_mysql_forge.php
pdo_oci_driver.php
pdo_oci_forge.php
pdo_odbc_driver.php
pdo_odbc_forge.php
pdo_pgsql_driver.php
pdo_pgsql_forge.php
pdo_sqlite_driver.php
pdo_sqlite_forge.php
pdo_sqlsrv_driver.php
pdo_sqlsrv_forge.php
postgre
index.html
postgre_driver.php
postgre_forge.php
postgre_result.php
postgre_utility.php
sqlite
index.html
sqlite_driver.php
sqlite_forge.php
sqlite_result.php
sqlite_utility.php
sqlite3
index.html
sqlite3_driver.php
sqlite3_forge.php
sqlite3_result.php
sqlite3_utility.php
sqlsrv
index.html
sqlsrv_driver.php
sqlsrv_forge.php
sqlsrv_result.php
sqlsrv_utility.php
index.html
fonts
index.html
texb.ttf
helpers
array_helper.php
captcha_helper.php
cookie_helper.php
date_helper.php
directory_helper.php
download_helper.php
email_helper.php
file_helper.php
form_helper.php
html_helper.php
index.html
inflector_helper.php
language_helper.php
number_helper.php
path_helper.php
security_helper.php
smiley_helper.php
string_helper.php
text_helper.php
typography_helper.php
url_helper.php
xml_helper.php
index.html
language
english
calendar_lang.php
date_lang.php
db_lang.php
email_lang.php
form_validation_lang.php
ftp_lang.php
imglib_lang.php
index.html
migration_lang.php
number_lang.php
pagination_lang.php
profiler_lang.php
unit_test_lang.php
upload_lang.php
index.html
libraries
Cache
Cache.php
drivers
Cache_apc.php
Cache_dummy.php
Cache_file.php
Cache_memcached.php
Cache_redis.php
Cache_wincache.php
index.html
index.html
Calendar.php
Cart.php
Driver.php
Email.php
Encrypt.php
Encryption.php
Form_validation.php
Ftp.php
Image_lib.php
Javascript
Jquery.php
index.html
Javascript.php
Migration.php
Pagination.php
Parser.php
Profiler.php
Session
Session.php
SessionHandlerInterface.php
Session_driver.php
drivers
Session_database_driver.php
Session_files_driver.php
Session_memcached_driver.php
Session_redis_driver.php
index.html
index.html
Table.php
Trackback.php
Typography.php
Unit_test.php
Upload.php
User_agent.php
Xmlrpc.php
Xmlrpcs.php
Zip.php
index.html
<?php
/**
* CodeIgniter
*
* An open source application development framework for PHP
*
* This content is released under the MIT License (MIT)
*
* Copyright (c) 2014 - 2018, 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 - 2018, 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');
/**
* Output Class
*
* Responsible for sending final output to the browser.
*
* @package CodeIgniter
* @subpackage Libraries
* @category Output
* @author EllisLab Dev Team
* @link https://codeigniter.com/user_guide/libraries/output.html
*/
class CI_Output {
/**
* Final output string
*
* @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 $mimes = array();
/**
* Mime-type for the current page
*
* @var string
*/
protected $mime_type = 'text/html';
/**
* Enable Profiler flag
*
* @var bool
*/
public $enable_profiler = FALSE;
/**
* php.ini zlib.output_compression flag
*
* @var bool
*/
protected $_zlib_oc = FALSE;
/**
* CI output compression flag
*
* @var bool
*/
protected $_compress_output = FALSE;
/**
* List of profiler sections
*
* @var array
*/
protected $_profiler_sections = array();
/**
* Parse markers flag
*
* Whether or not to parse variables like 0.0167 and {memory_usage}.
*
* @var bool
*/
public $parse_exec_vars = TRUE;
/**
* mbstring.func_overload flag
*
* @var bool
*/
protected static $func_overload;
/**
* Class constructor
*
* Determines whether zLib output compression will be used.
*
* @return void
*/
public function __construct()
{
$this->_zlib_oc = (bool) ini_get('zlib.output_compression');
$this->_compress_output = (
$this->_zlib_oc === FALSE
&& config_item('compress_output') === TRUE
&& extension_loaded('zlib')
);
isset(self::$func_overload) OR self::$func_overload = (extension_loaded('mbstring') && ini_get('mbstring.func_overload'));
// Get mime types for later
$this->mimes =& get_mimes();
log_message('info', 'Output Class Initialized');
}
// --------------------------------------------------------------------
/**
* Get Output
*
* Returns the current output string.
*
* @return string
*/
public function get_output()
{
return $this->final_output;
}
// --------------------------------------------------------------------
/**
* Set Output
*
* Sets the output string.
*
* @param string $output Output data
* @return CI_Output
*/
public function set_output($output)
{
$this->final_output = $output;
return $this;
}
// --------------------------------------------------------------------
/**
* Append Output
*
* Appends data onto the output string.
*
* @param string $output Data to append
* @return CI_Output
*/
public function append_output($output)
{
$this->final_output .= $output;
return $this;
}
// --------------------------------------------------------------------
/**
* Set Header
*
* Lets you set a server header which will be sent with the final output.
*
* Note: If a file is cached, headers will not be sent.
* @todo We need to figure out how to permit headers to be cached.
*
* @param string $header Header
* @param bool $replace Whether to replace the old header value, if already set
* @return CI_Output
*/
public function set_header($header, $replace = TRUE)
{
// If zlib.output_compression is enabled it will compress the output,
// but it will not modify the content-length header to compensate for
// the reduction, causing the browser to hang waiting for more data.
// We'll just skip content-length in those cases.
if ($this->_zlib_oc && strncasecmp($header, 'content-length', 14) === 0)
{
return $this;
}
$this->headers[] = array($header, $replace);
return $this;
}
// --------------------------------------------------------------------
/**
* Set Content-Type Header
*
* @param string $mime_type Extension of the file we're outputting
* @param string $charset Character set (default: NULL)
* @return CI_Output
*/
public function set_content_type($mime_type, $charset = NULL)
{
if (strpos($mime_type, '/') === FALSE)
{
$extension = ltrim($mime_type, '.');
// Is this extension supported?
if (isset($this->mimes[$extension]))
{
$mime_type =& $this->mimes[$extension];
if (is_array($mime_type))
{
$mime_type = current($mime_type);
}
}
}
$this->mime_type = $mime_type;
if (empty($charset))
{
$charset = config_item('charset');
}
$header = 'Content-Type: '.$mime_type
.(empty($charset) ? '' : '; charset='.$charset);
$this->headers[] = array($header, TRUE);
return $this;
}
// --------------------------------------------------------------------
/**
* Get Current Content-Type Header
*
* @return string 'text/html', if not already set
*/
public function get_content_type()
{
for ($i = 0, $c = count($this->headers); $i < $c; $i++)
{
if (sscanf($this->headers[$i][0], 'Content-Type: %[^;]', $content_type) === 1)
{
return $content_type;
}
}
return 'text/html';
}
// --------------------------------------------------------------------
/**
* Get Header
*
* @param string $header
* @return string
*/
public function get_header($header)
{
// Combine headers already sent with our batched headers
$headers = array_merge(
// We only need [x][0] from our multi-dimensional array
array_map('array_shift', $this->headers),
headers_list()
);
if (empty($headers) OR empty($header))
{
return NULL;
}
// Count backwards, in order to get the last matching header
for ($c = count($headers) - 1; $c > -1; $c--)
{
if (strncasecmp($header, $headers[$c], $l = self::strlen($header)) === 0)
{
return trim(self::substr($headers[$c], $l+1));
}
}
return NULL;
}
// --------------------------------------------------------------------
/**
* Set HTTP Status Header
*
* As of version 1.7.2, this is an alias for common function
* set_status_header().
*
* @param int $code Status code (default: 200)
* @param string $text Optional message
* @return CI_Output
*/
public function set_status_header($code = 200, $text = '')
{
set_status_header($code, $text);
return $this;
}
// --------------------------------------------------------------------
/**
* Enable/disable Profiler
*
* @param bool $val TRUE to enable or FALSE to disable
* @return CI_Output
*/
public function enable_profiler($val = TRUE)
{
$this->enable_profiler = is_bool($val) ? $val : TRUE;
return $this;
}
// --------------------------------------------------------------------
/**
* Set Profiler Sections
*
* Allows override of default/config settings for
* Profiler section display.
*
* @param array $sections Profiler sections
* @return CI_Output
*/
public function set_profiler_sections($sections)
{
if (isset($sections['query_toggle_count']))
{
$this->_profiler_sections['query_toggle_count'] = (int) $sections['query_toggle_count'];
unset($sections['query_toggle_count']);
}
foreach ($sections as $section => $enable)
{
$this->_profiler_sections[$section] = ($enable !== FALSE);
}
return $this;
}
// --------------------------------------------------------------------
/**
* Set Cache
*
* @param int $time Cache expiration time in minutes
* @return CI_Output
*/
public function cache($time)
{
$this->cache_expiration = is_numeric($time) ? $time : 0;
return $this;
}
// --------------------------------------------------------------------
/**
* Display Output
*
* Processes and sends finalized output data to the browser along
* with any server headers and profile data. It also stops benchmark
* timers so the page rendering speed and memory usage can be shown.
*
* Note: All "view" data is automatically put into $this->final_output
* by controller class.
*
* @uses CI_Output::$final_output
* @param string $output Output data override
* @return void
*/
public function _display($output = '')
{
// Note: We use load_class() 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.
$BM =& load_class('Benchmark', 'core');
$CFG =& load_class('Config', 'core');
// Grab the super object if we can.
if (class_exists('CI_Controller', FALSE))
{
$CI =& get_instance();
}
// --------------------------------------------------------------------
// Set the output data
if ($output === '')
{
$output =& $this->final_output;
}
// --------------------------------------------------------------------
// Do we need to write a cache file? Only if the controller does not have its
// own _output() method and we are not dealing with a cache file, which we
// can determine by the existence of the $CI object above
if ($this->cache_expiration > 0 && isset($CI) && ! method_exists($CI, '_output'))
{
$this->_write_cache($output);
}
// --------------------------------------------------------------------
// Parse out the elapsed time and memory usage,
// then swap the pseudo-variables with the data
$elapsed = $BM->elapsed_time('total_execution_time_start', 'total_execution_time_end');
if ($this->parse_exec_vars === TRUE)
{
$memory = round(memory_get_usage() / 1024 / 1024, 2).'MB';
$output = str_replace(array('0.0167', '{memory_usage}'), array($elapsed, $memory), $output);
}
// --------------------------------------------------------------------
// Is compression requested?
if (isset($CI) // This means that we're not serving a cache file, if we were, it would already be compressed
&& $this->_compress_output === TRUE
&& isset($_SERVER['HTTP_ACCEPT_ENCODING']) && 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[0], $header[1]);
}
}
// --------------------------------------------------------------------
// Does the $CI object exist?
// If not we know we are dealing with a cache file so we'll
// simply echo out the data and exit.
if ( ! isset($CI))
{
if ($this->_compress_output === TRUE)
{
if (isset($_SERVER['HTTP_ACCEPT_ENCODING']) && strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== FALSE)
{
header('Content-Encoding: gzip');
header('Content-Length: '.self::strlen($output));
}
else
{
// User agent doesn't support gzip compression,
// so we'll have to decompress our cache
$output = gzinflate(self::substr($output, 10, -8));
}
}
echo $output;
log_message('info', 'Final output sent to browser');
log_message('debug', 'Total execution time: '.$elapsed);
return;
}
// --------------------------------------------------------------------
// Do we need to generate profile data?
// If so, load the Profile class and run it.
if ($this->enable_profiler === TRUE)
{
$CI->load->library('profiler');
if ( ! empty($this->_profiler_sections))
{
$CI->profiler->set_sections($this->_profiler_sections);
}
// If the output data contains closing </body> and </html> tags
// we will remove them and add them back after we insert the profile data
$output = preg_replace('|</body>.*?</html>|is', '', $output, -1, $count).$CI->profiler->run();
if ($count > 0)
{
$output .= '</body></html>';
}
}
// Does the controller contain a function named _output()?
// If so send the output there. Otherwise, echo it.
if (method_exists($CI, '_output'))
{
$CI->_output($output);
}
else
{
echo $output; // Send it to the browser!
}
log_message('info', 'Final output sent to browser');
log_message('debug', 'Total execution time: '.$elapsed);
}
// --------------------------------------------------------------------
/**
* Write Cache
*
* @param string $output Output data to cache
* @return void
*/
public function _write_cache($output)
{
$CI =& get_instance();
$path = $CI->config->item('cache_path');
$cache_path = ($path === '') ? APPPATH.'cache/' : $path;
if ( ! is_dir($cache_path) OR ! is_really_writable($cache_path))
{
log_message('error', 'Unable to write cache file: '.$cache_path);
return;
}
$uri = $CI->config->item('base_url')
.$CI->config->item('index_page')
.$CI->uri->uri_string();
if (($cache_query_string = $CI->config->item('cache_query_string')) && ! empty($_SERVER['QUERY_STRING']))
{
if (is_array($cache_query_string))
{
$uri .= '?'.http_build_query(array_intersect_key($_GET, array_flip($cache_query_string)));
}
else
{
$uri .= '?'.$_SERVER['QUERY_STRING'];
}
}
$cache_path .= md5($uri);
if ( ! $fp = @fopen($cache_path, 'w+b'))
{
log_message('error', 'Unable to write cache file: '.$cache_path);
return;
}
if ( ! flock($fp, LOCK_EX))
{
log_message('error', 'Unable to secure a file lock for file at: '.$cache_path);
fclose($fp);
return;
}
// If output compression is enabled, compress the cache
// itself, so that we don't have to do that each time
// we're serving it
if ($this->_compress_output === TRUE)
{
$output = gzencode($output);
if ($this->get_header('content-type') === NULL)
{
$this->set_content_type($this->mime_type);
}
}
$expire = time() + ($this->cache_expiration * 60);
// Put together our serialized info.
$cache_info = serialize(array(
'expire' => $expire,
'headers' => $this->headers
));
$output = $cache_info.'ENDCI--->'.$output;
for ($written = 0, $length = self::strlen($output); $written < $length; $written += $result)
{
if (($result = fwrite($fp, self::substr($output, $written))) === FALSE)
{
break;
}
}
flock($fp, LOCK_UN);
fclose($fp);
if ( ! is_int($result))
{
@unlink($cache_path);
log_message('error', 'Unable to write the complete cache content at: '.$cache_path);
return;
}
chmod($cache_path, 0640);
log_message('debug', 'Cache file written: '.$cache_path);
// Send HTTP cache-control headers to browser to match file cache settings.
$this->set_cache_header($_SERVER['REQUEST_TIME'], $expire);
}
// --------------------------------------------------------------------
/**
* Update/serve cached output
*
* @uses CI_Config
* @uses CI_URI
*
* @param object &$CFG CI_Config class instance
* @param object &$URI CI_URI class instance
* @return bool TRUE on success or FALSE on failure
*/
public function _display_cache(&$CFG, &$URI)
{
$cache_path = ($CFG->item('cache_path') === '') ? APPPATH.'cache/' : $CFG->item('cache_path');
// Build the file path. The file name is an MD5 hash of the full URI
$uri = $CFG->item('base_url').$CFG->item('index_page').$URI->uri_string;
if (($cache_query_string = $CFG->item('cache_query_string')) && ! empty($_SERVER['QUERY_STRING']))
{
if (is_array($cache_query_string))
{
$uri .= '?'.http_build_query(array_intersect_key($_GET, array_flip($cache_query_string)));
}
else
{
$uri .= '?'.$_SERVER['QUERY_STRING'];
}
}
$filepath = $cache_path.md5($uri);
if ( ! file_exists($filepath) OR ! $fp = @fopen($filepath, 'rb'))
{
return FALSE;
}
flock($fp, LOCK_SH);
$cache = (filesize($filepath) > 0) ? fread($fp, filesize($filepath)) : '';
flock($fp, LOCK_UN);
fclose($fp);
// Look for embedded serialized file info.
if ( ! preg_match('/^(.*)ENDCI--->/', $cache, $match))
{
return FALSE;
}
$cache_info = unserialize($match[1]);
$expire = $cache_info['expire'];
$last_modified = filemtime($filepath);
// Has the file expired?
if ($_SERVER['REQUEST_TIME'] >= $expire && is_really_writable($cache_path))
{
// If so we'll delete it.
@unlink($filepath);
log_message('debug', 'Cache file has expired. File deleted.');
return FALSE;
}
// Send the HTTP cache control headers
$this->set_cache_header($last_modified, $expire);
// Add headers from cache file.
foreach ($cache_info['headers'] as $header)
{
$this->set_header($header[0], $header[1]);
}
// Display the cache
$this->_display(self::substr($cache, self::strlen($match[0])));
log_message('debug', 'Cache file is current. Sending it to browser.');
return TRUE;
}
// --------------------------------------------------------------------
/**
* Delete cache
*
* @param string $uri URI string
* @return bool
*/
public function delete_cache($uri = '')
{
$CI =& get_instance();
$cache_path = $CI->config->item('cache_path');
if ($cache_path === '')
{
$cache_path = APPPATH.'cache/';
}
if ( ! is_dir($cache_path))
{
log_message('error', 'Unable to find cache path: '.$cache_path);
return FALSE;
}
if (empty($uri))
{
$uri = $CI->uri->uri_string();
if (($cache_query_string = $CI->config->item('cache_query_string')) && ! empty($_SERVER['QUERY_STRING']))
{
if (is_array($cache_query_string))
{
$uri .= '?'.http_build_query(array_intersect_key($_GET, array_flip($cache_query_string)));
}
else
{
$uri .= '?'.$_SERVER['QUERY_STRING'];
}
}
}
$cache_path .= md5($CI->config->item('base_url').$CI->config->item('index_page').ltrim($uri, '/'));
if ( ! @unlink($cache_path))
{
log_message('error', 'Unable to delete cache file for '.$uri);
return FALSE;
}
return TRUE;
}
// --------------------------------------------------------------------
/**
* Set Cache Header
*
* Set the HTTP headers to match the server-side file cache settings
* in order to reduce bandwidth.
*
* @param int $last_modified Timestamp of when the page was last modified
* @param int $expiration Timestamp of when should the requested page expire from cache
* @return void
*/
public function set_cache_header($last_modified, $expiration)
{
$max_age = $expiration - $_SERVER['REQUEST_TIME'];
if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && $last_modified <= strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']))
{
$this->set_status_header(304);
exit;
}
header('Pragma: public');
header('Cache-Control: max-age='.$max_age.', public');
header('Expires: '.gmdate('D, d M Y H:i:s', $expiration).' GMT');
header('Last-modified: '.gmdate('D, d M Y H:i:s', $last_modified).' GMT');
}
// --------------------------------------------------------------------
/**
* Byte-safe strlen()
*
* @param string $str
* @return int
*/
protected static function strlen($str)
{
return (self::$func_overload)
? mb_strlen($str, '8bit')
: strlen($str);
}
// --------------------------------------------------------------------
/**
* Byte-safe substr()
*
* @param string $str
* @param int $start
* @param int $length
* @return string
*/
protected static function substr($str, $start, $length = NULL)
{
if (self::$func_overload)
{
// mb_substr($str, $start, null, '8bit') returns an empty
// string on PHP 5.3
isset($length) OR $length = ($start >= 0 ? self::strlen($str) - $start : -$start);
return mb_substr($str, $start, $length, '8bit');
}
return isset($length)
? substr($str, $start, $length)
: substr($str, $start);
}
}