diff options
Diffstat (limited to 'user_guide_src/source/libraries/output.rst')
| -rw-r--r-- | user_guide_src/source/libraries/output.rst | 233 |
1 files changed, 0 insertions, 233 deletions
diff --git a/user_guide_src/source/libraries/output.rst b/user_guide_src/source/libraries/output.rst deleted file mode 100644 index 92060f66a..000000000 --- a/user_guide_src/source/libraries/output.rst +++ /dev/null @@ -1,233 +0,0 @@ -############ -Output Class -############ - -The Output class is a core class with one main function: To send the -finalized web page to the requesting browser. It is also responsible for -:doc:`caching <../general/caching>` your web pages, if you use that -feature. - -.. note:: This class is initialized automatically by the system so there - is no need to do it manually. - -Under normal circumstances you won't even notice the Output class since -it works transparently without your intervention. For example, when you -use the :doc:`Loader <../libraries/loader>` class to load a view file, -it's automatically passed to the Output class, which will be called -automatically by CodeIgniter at the end of system execution. It is -possible, however, for you to manually intervene with the output if you -need to. - -.. contents:: - :local: - -.. raw:: html - - <div class="custom-index container"></div> - -*************** -Class Reference -*************** - -.. php:class:: CI_Output - - .. attribute:: $parse_exec_vars = TRUE; - - Enables/disables parsing of the {elapsed_time} and {memory_usage} pseudo-variables. - - CodeIgniter will parse those tokens in your output by default. To disable this, set - this property to FALSE in your controller. - :: - - $this->output->parse_exec_vars = FALSE; - - .. php:method:: set_output($output) - - :param string $output: String to set the output to - :returns: CI_Output instance (method chaining) - :rtype: CI_Output - - Permits you to manually set the final output string. Usage example:: - - $this->output->set_output($data); - - .. important:: If you do set your output manually, it must be the last thing done - in the function you call it from. For example, if you build a page in one - of your controller methods, don't set the output until the end. - - .. php:method:: set_content_type($mime_type[, $charset = NULL]) - - :param string $mime_type: MIME Type idenitifer string - :param string $charset: Character set - :returns: CI_Output instance (method chaining) - :rtype: CI_Output - - Permits you to set the mime-type of your page so you can serve JSON data, JPEG's, XML, etc easily. - :: - - $this->output - ->set_content_type('application/json') - ->set_output(json_encode(array('foo' => 'bar'))); - - $this->output - ->set_content_type('jpeg') // You could also use ".jpeg" which will have the full stop removed before looking in config/mimes.php - ->set_output(file_get_contents('files/something.jpg')); - - .. important:: Make sure any non-mime string you pass to this method - exists in *application/config/mimes.php* or it will have no effect. - - You can also set the character set of the document, by passing a second argument:: - - $this->output->set_content_type('css', 'utf-8'); - - .. php:method:: get_content_type() - - :returns: Content-Type string - :rtype: string - - Returns the Content-Type HTTP header that's currently in use, excluding the character set value. - :: - - $mime = $this->output->get_content_type(); - - .. note:: If not set, the default return value is 'text/html'. - - .. php:method:: get_header($header) - - :param string $header: HTTP header name - :returns: HTTP response header or NULL if not found - :rtype: mixed - - Returns the requested HTTP header value, or NULL if the requested header is not set. - Example:: - - $this->output->set_content_type('text/plain', 'UTF-8'); - echo $this->output->get_header('content-type'); - // Outputs: text/plain; charset=utf-8 - - .. note:: The header name is compared in a case-insensitive manner. - - .. note:: Raw headers sent via PHP's native ``header()`` function are also detected. - - .. php:method:: get_output() - - :returns: Output string - :rtype: string - - Permits you to manually retrieve any output that has been sent for - storage in the output class. Usage example:: - - $string = $this->output->get_output(); - - Note that data will only be retrievable from this function if it has - been previously sent to the output class by one of the CodeIgniter - functions like ``$this->load->view()``. - - .. php:method:: append_output($output) - - :param string $output: Additional output data to append - :returns: CI_Output instance (method chaining) - :rtype: CI_Output - - Appends data onto the output string. - :: - - $this->output->append_output($data); - - .. php:method:: set_header($header[, $replace = TRUE]) - - :param string $header: HTTP response header - :param bool $replace: Whether to replace the old header value, if it is already set - :returns: CI_Output instance (method chaining) - :rtype: CI_Output - - Permits you to manually set server headers, which the output class will - send for you when outputting the final rendered display. Example:: - - $this->output->set_header('HTTP/1.0 200 OK'); - $this->output->set_header('HTTP/1.1 200 OK'); - $this->output->set_header('Last-Modified: '.gmdate('D, d M Y H:i:s', $last_update).' GMT'); - $this->output->set_header('Cache-Control: no-store, no-cache, must-revalidate'); - $this->output->set_header('Cache-Control: post-check=0, pre-check=0'); - $this->output->set_header('Pragma: no-cache'); - - .. php:method:: set_status_header([$code = 200[, $text = '']]) - - :param int $code: HTTP status code - :param string $text: Optional message - :returns: CI_Output instance (method chaining) - :rtype: CI_Output - - Permits you to manually set a server status header. Example:: - - $this->output->set_status_header(401); - // Sets the header as: Unauthorized - - `See here <http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html>`_ for a full list of headers. - - .. note:: This method is an alias for :doc:`Common function <../general/common_functions>` - :func:`set_status_header()`. - - .. php:method:: enable_profiler([$val = TRUE]) - - :param bool $val: Whether to enable or disable the Profiler - :returns: CI_Output instance (method chaining) - :rtype: CI_Output - - Permits you to enable/disable the :doc:`Profiler <../general/profiling>`, which will display benchmark - and other data at the bottom of your pages for debugging and optimization purposes. - - To enable the profiler place the following line anywhere within your - :doc:`Controller <../general/controllers>` methods:: - - $this->output->enable_profiler(TRUE); - - When enabled a report will be generated and inserted at the bottom of your pages. - - To disable the profiler you would use:: - - $this->output->enable_profiler(FALSE); - - .. php:method:: set_profiler_sections($sections) - - :param array $sections: Profiler sections - :returns: CI_Output instance (method chaining) - :rtype: CI_Output - - Permits you to enable/disable specific sections of the Profiler when it is enabled. - Please refer to the :doc:`Profiler <../general/profiling>` documentation for further information. - - .. php:method:: cache($time) - - :param int $time: Cache expiration time in minutes - :returns: CI_Output instance (method chaining) - :rtype: CI_Output - - Caches the current page for the specified amount of minutes. - - For more information, please see the :doc:`caching documentation <../general/caching>`. - - .. php:method:: _display([$output = '']) - - :param string $output: Output data override - :returns: void - :rtype: void - - Sends finalized output data to the browser along with any server headers. It also stops benchmark - timers. - - .. note:: This method is called automatically at the end of script execution, you won't need to - call it manually unless you are aborting script execution using ``exit()`` or ``die()`` in your code. - - Example:: - - $response = array('status' => 'OK'); - - $this->output - ->set_status_header(200) - ->set_content_type('application/json', 'utf-8') - ->set_output(json_encode($response, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES)) - ->_display(); - exit; - - .. note:: Calling this method manually without aborting script execution will result in duplicated output. |