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authorAndrey Andreev <narf@devilix.net>2019-09-19 14:08:45 +0200
committerAndrey Andreev <narf@devilix.net>2019-09-19 14:08:45 +0200
commitb73eb19aed66190c10c9cad476da7c36c271d6dc (patch)
treeb3d5d4f960569c30701934416d6d51628bde81a7 /user_guide_src/source/libraries/loader.rst
parent6e052d80b95b9332ed592cdc3431b5f9dc8dd250 (diff)
[ci skip] 3.1.11 release
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-############
-Loader Class
-############
-
-Loader, as the name suggests, is used to load elements. These elements
-can be libraries (classes) :doc:`View files <../general/views>`,
-:doc:`Drivers <../general/drivers>`,
-:doc:`Helpers <../general/helpers>`,
-:doc:`Models <../general/models>`, or your own files.
-
-.. note:: This class is initialized automatically by the system so there
- is no need to do it manually.
-
-.. contents::
- :local:
-
-.. raw:: html
-
- <div class="custom-index container"></div>
-
-**********************
-Application "Packages"
-**********************
-
-An application package allows for the easy distribution of complete sets
-of resources in a single directory, complete with its own libraries,
-models, helpers, config, and language files. It is recommended that
-these packages be placed in the application/third_party directory. Below
-is a sample map of an package directory.
-
-The following is an example of a directory for an application package
-named "Foo Bar".
-
-::
-
- /application/third_party/foo_bar
-
- config/
- helpers/
- language/
- libraries/
- models/
-
-Whatever the purpose of the "Foo Bar" application package, it has its
-own config files, helpers, language files, libraries, and models. To use
-these resources in your controllers, you first need to tell the Loader
-that you are going to be loading resources from a package, by adding the
-package path via the ``add_package_path()`` method.
-
-Package view files
-------------------
-
-By Default, package view files paths are set when ``add_package_path()``
-is called. View paths are looped through, and once a match is
-encountered that view is loaded.
-
-In this instance, it is possible for view naming collisions within
-packages to occur, and possibly the incorrect package being loaded. To
-ensure against this, set an optional second parameter of FALSE when
-calling ``add_package_path()``.
-
-::
-
- $this->load->add_package_path(APPPATH.'my_app', FALSE);
- $this->load->view('my_app_index'); // Loads
- $this->load->view('welcome_message'); // Will not load the default welcome_message b/c the second param to add_package_path is FALSE
-
- // Reset things
- $this->load->remove_package_path(APPPATH.'my_app');
-
- // Again without the second parameter:
- $this->load->add_package_path(APPPATH.'my_app');
- $this->load->view('my_app_index'); // Loads
- $this->load->view('welcome_message'); // Loads
-
-***************
-Class Reference
-***************
-
-.. php:class:: CI_Loader
-
- .. php:method:: library($library[, $params = NULL[, $object_name = NULL]])
-
- :param mixed $library: Library name as a string or an array with multiple libraries
- :param array $params: Optional array of parameters to pass to the loaded library's constructor
- :param string $object_name: Optional object name to assign the library to
- :returns: CI_Loader instance (method chaining)
- :rtype: CI_Loader
-
- This method is used to load core classes.
-
- .. note:: We use the terms "class" and "library" interchangeably.
-
- For example, if you would like to send email with CodeIgniter, the first
- step is to load the email class within your controller::
-
- $this->load->library('email');
-
- Once loaded, the library will be ready for use, using ``$this->email``.
-
- Library files can be stored in subdirectories within the main
- "libraries" directory, or within your personal *application/libraries*
- directory. To load a file located in a subdirectory, simply include the
- path, relative to the "libraries" directory. For example, if you have
- file located at::
-
- libraries/flavors/Chocolate.php
-
- You will load it using::
-
- $this->load->library('flavors/chocolate');
-
- You may nest the file in as many subdirectories as you want.
-
- Additionally, multiple libraries can be loaded at the same time by
- passing an array of libraries to the load method.
- ::
-
- $this->load->library(array('email', 'table'));
-
- **Setting options**
-
- The second (optional) parameter allows you to optionally pass
- configuration setting. You will typically pass these as an array::
-
- $config = array (
- 'mailtype' => 'html',
- 'charset' => 'utf-8',
- 'priority' => '1'
- );
-
- $this->load->library('email', $config);
-
- Config options can usually also be set via a config file. Each library
- is explained in detail in its own page, so please read the information
- regarding each one you would like to use.
-
- Please take note, when multiple libraries are supplied in an array for
- the first parameter, each will receive the same parameter information.
-
- **Assigning a Library to a different object name**
-
- If the third (optional) parameter is blank, the library will usually be
- assigned to an object with the same name as the library. For example, if
- the library is named Calendar, it will be assigned to a variable named
- ``$this->calendar``.
-
- If you prefer to set your own class names you can pass its value to the
- third parameter::
-
- $this->load->library('calendar', NULL, 'my_calendar');
-
- // Calendar class is now accessed using:
- $this->my_calendar
-
- Please take note, when multiple libraries are supplied in an array for
- the first parameter, this parameter is discarded.
-
- .. php:method:: driver($library[, $params = NULL[, $object_name]])
-
- :param mixed $library: Library name as a string or an array with multiple libraries
- :param array $params: Optional array of parameters to pass to the loaded library's constructor
- :param string $object_name: Optional object name to assign the library to
- :returns: CI_Loader instance (method chaining)
- :rtype: CI_Loader
-
- This method is used to load driver libraries, acts very much like the
- ``library()`` method.
-
- As an example, if you would like to use sessions with CodeIgniter, the first
- step is to load the session driver within your controller::
-
- $this->load->driver('session');
-
- Once loaded, the library will be ready for use, using ``$this->session``.
-
- Driver files must be stored in a subdirectory within the main
- "libraries" directory, or within your personal *application/libraries*
- directory. The subdirectory must match the parent class name. Read the
- :doc:`Drivers <../general/drivers>` description for details.
-
- Additionally, multiple driver libraries can be loaded at the same time by
- passing an array of drivers to the load method.
- ::
-
- $this->load->driver(array('session', 'cache'));
-
- **Setting options**
-
- The second (optional) parameter allows you to optionally pass
- configuration settings. You will typically pass these as an array::
-
- $config = array(
- 'sess_driver' => 'cookie',
- 'sess_encrypt_cookie' => true,
- 'encryption_key' => 'mysecretkey'
- );
-
- $this->load->driver('session', $config);
-
- Config options can usually also be set via a config file. Each library
- is explained in detail in its own page, so please read the information
- regarding each one you would like to use.
-
- **Assigning a Driver to a different object name**
-
- If the third (optional) parameter is blank, the library will be assigned
- to an object with the same name as the parent class. For example, if
- the library is named Session, it will be assigned to a variable named
- ``$this->session``.
-
- If you prefer to set your own class names you can pass its value to the
- third parameter::
-
- $this->load->library('session', '', 'my_session');
-
- // Session class is now accessed using:
- $this->my_session
-
- .. php:method:: view($view[, $vars = array()[, return = FALSE]])
-
- :param string $view: View name
- :param array $vars: An associative array of variables
- :param bool $return: Whether to return the loaded view
- :returns: View content string if $return is set to TRUE, otherwise CI_Loader instance (method chaining)
- :rtype: mixed
-
- This method is used to load your View files. If you haven't read the
- :doc:`Views <../general/views>` section of the user guide it is
- recommended that you do since it shows you how this method is
- typically used.
-
- The first parameter is required. It is the name of the view file you
- would like to load.
-
- .. note:: The .php file extension does not need to be specified unless
- you use something other than .php.
-
- The second **optional** parameter can take an associative array or an
- object as input, which it runs through the PHP
- `extract() <http://php.net/extract>`_ function to convert to variables
- that can be used in your view files. Again, read the
- :doc:`Views <../general/views>` page to learn how this might be useful.
-
- The third **optional** parameter lets you change the behavior of the
- method so that it returns data as a string rather than sending it to
- your browser. This can be useful if you want to process the data in some
- way. If you set the parameter to TRUE (boolean) it will return data. The
- default behavior is FALSE, which sends it to your browser. Remember to
- assign it to a variable if you want the data returned::
-
- $string = $this->load->view('myfile', '', TRUE);
-
- .. php:method:: vars($vars[, $val = ''])
-
- :param mixed $vars: An array of variables or a single variable name
- :param mixed $val: Optional variable value
- :returns: CI_Loader instance (method chaining)
- :rtype: CI_Loader
-
- This method takes an associative array as input and generates
- variables using the PHP `extract() <http://php.net/extract>`_
- function. This method produces the same result as using the second
- parameter of the ``$this->load->view()`` method above. The reason you
- might want to use this method independently is if you would like to
- set some global variables in the constructor of your controller and have
- them become available in any view file loaded from any method. You can
- have multiple calls to this method. The data get cached and merged
- into one array for conversion to variables.
-
- .. php:method:: get_var($key)
-
- :param string $key: Variable name key
- :returns: Value if key is found, NULL if not
- :rtype: mixed
-
- This method checks the associative array of variables available to
- your views. This is useful if for any reason a var is set in a library
- or another controller method using ``$this->load->vars()``.
-
- .. php:method:: get_vars()
-
- :returns: An array of all assigned view variables
- :rtype: array
-
- This method retrieves all variables available to your views.
-
- .. php:method:: clear_vars()
-
- :returns: CI_Loader instance (method chaining)
- :rtype: CI_Loader
-
- Clears cached view variables.
-
- .. php:method:: model($model[, $name = ''[, $db_conn = FALSE]])
-
- :param mixed $model: Model name or an array containing multiple models
- :param string $name: Optional object name to assign the model to
- :param string $db_conn: Optional database configuration group to load
- :returns: CI_Loader instance (method chaining)
- :rtype: CI_Loader
-
- ::
-
- $this->load->model('model_name');
-
-
- If your model is located in a subdirectory, include the relative path
- from your models directory. For example, if you have a model located at
- *application/models/blog/Queries.php* you'll load it using::
-
- $this->load->model('blog/queries');
-
- If you would like your model assigned to a different object name you can
- specify it via the second parameter of the loading method::
-
- $this->load->model('model_name', 'fubar');
- $this->fubar->method();
-
- .. php:method:: database([$params = ''[, $return = FALSE[, $query_builder = NULL]]])
-
- :param mixed $params: Database group name or configuration options
- :param bool $return: Whether to return the loaded database object
- :param bool $query_builder: Whether to load the Query Builder
- :returns: Loaded CI_DB instance or FALSE on failure if $return is set to TRUE, otherwise CI_Loader instance (method chaining)
- :rtype: mixed
-
- This method lets you load the database class. The two parameters are
- **optional**. Please see the :doc:`database <../database/index>`
- section for more info.
-
- .. php:method:: dbforge([$db = NULL[, $return = FALSE]])
-
- :param object $db: Database object
- :param bool $return: Whether to return the Database Forge instance
- :returns: Loaded CI_DB_forge instance if $return is set to TRUE, otherwise CI_Loader instance (method chaining)
- :rtype: mixed
-
- Loads the :doc:`Database Forge <../database/forge>` class, please refer
- to that manual for more info.
-
- .. php:method:: dbutil([$db = NULL[, $return = FALSE]])
-
- :param object $db: Database object
- :param bool $return: Whether to return the Database Utilities instance
- :returns: Loaded CI_DB_utility instance if $return is set to TRUE, otherwise CI_Loader instance (method chaining)
- :rtype: mixed
-
- Loads the :doc:`Database Utilities <../database/utilities>` class, please
- refer to that manual for more info.
-
- .. php:method:: helper($helpers)
-
- :param mixed $helpers: Helper name as a string or an array containing multiple helpers
- :returns: CI_Loader instance (method chaining)
- :rtype: CI_Loader
-
- This method loads helper files, where file_name is the name of the
- file, without the _helper.php extension.
-
- .. php:method:: file($path[, $return = FALSE])
-
- :param string $path: File path
- :param bool $return: Whether to return the loaded file
- :returns: File contents if $return is set to TRUE, otherwise CI_Loader instance (method chaining)
- :rtype: mixed
-
- This is a generic file loading method. Supply the filepath and name in
- the first parameter and it will open and read the file. By default the
- data is sent to your browser, just like a View file, but if you set the
- second parameter to boolean TRUE it will instead return the data as a
- string.
-
- .. php:method:: language($files[, $lang = ''])
-
- :param mixed $files: Language file name or an array of multiple language files
- :param string $lang: Language name
- :returns: CI_Loader instance (method chaining)
- :rtype: CI_Loader
-
- This method is an alias of the :doc:`language loading
- method <language>`: ``$this->lang->load()``.
-
- .. php:method:: config($file[, $use_sections = FALSE[, $fail_gracefully = FALSE]])
-
- :param string $file: Configuration file name
- :param bool $use_sections: Whether configuration values should be loaded into their own section
- :param bool $fail_gracefully: Whether to just return FALSE in case of failure
- :returns: TRUE on success, FALSE on failure
- :rtype: bool
-
- This method is an alias of the :doc:`config file loading
- method <config>`: ``$this->config->load()``
-
- .. php:method:: is_loaded($class)
-
- :param string $class: Class name
- :returns: Singleton property name if found, FALSE if not
- :rtype: mixed
-
- Allows you to check if a class has already been loaded or not.
-
- .. note:: The word "class" here refers to libraries and drivers.
-
- If the requested class has been loaded, the method returns its assigned
- name in the CI Super-object and FALSE if it's not::
-
- $this->load->library('form_validation');
- $this->load->is_loaded('Form_validation'); // returns 'form_validation'
-
- $this->load->is_loaded('Nonexistent_library'); // returns FALSE
-
- .. important:: If you have more than one instance of a class (assigned to
- different properties), then the first one will be returned.
-
- ::
-
- $this->load->library('form_validation', $config, 'fv');
- $this->load->library('form_validation');
-
- $this->load->is_loaded('Form_validation'); // returns 'fv'
-
- .. php:method:: add_package_path($path[, $view_cascade = TRUE])
-
- :param string $path: Path to add
- :param bool $view_cascade: Whether to use cascading views
- :returns: CI_Loader instance (method chaining)
- :rtype: CI_Loader
-
- Adding a package path instructs the Loader class to prepend a given path
- for subsequent requests for resources. As an example, the "Foo Bar"
- application package above has a library named Foo_bar.php. In our
- controller, we'd do the following::
-
- $this->load->add_package_path(APPPATH.'third_party/foo_bar/')
- ->library('foo_bar');
-
- .. php:method:: remove_package_path([$path = ''])
-
- :param string $path: Path to remove
- :returns: CI_Loader instance (method chaining)
- :rtype: CI_Loader
-
- When your controller is finished using resources from an application
- package, and particularly if you have other application packages you
- want to work with, you may wish to remove the package path so the Loader
- no longer looks in that directory for resources. To remove the last path
- added, simply call the method with no parameters.
-
- Or to remove a specific package path, specify the same path previously
- given to ``add_package_path()`` for a package.::
-
- $this->load->remove_package_path(APPPATH.'third_party/foo_bar/');
-
- .. php:method:: get_package_paths([$include_base = TRUE])
-
- :param bool $include_base: Whether to include BASEPATH
- :returns: An array of package paths
- :rtype: array
-
- Returns all currently available package paths. \ No newline at end of file