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-rw-r--r--user_guide_src/source/libraries/loader.rst531
1 files changed, 298 insertions, 233 deletions
diff --git a/user_guide_src/source/libraries/loader.rst b/user_guide_src/source/libraries/loader.rst
index b048f4881..20e1c1d3c 100644
--- a/user_guide_src/source/libraries/loader.rst
+++ b/user_guide_src/source/libraries/loader.rst
@@ -11,337 +11,402 @@ can be libraries (classes) :doc:`View files <../general/views>`,
.. note:: This class is initialized automatically by the system so there
is no need to do it manually.
-The following methods are available in this class:
+.. contents::
+ :local:
-$this->load->library('class_name', $config, 'object name')
-==========================================================
+.. raw:: html
-This method is used to load core classes. Where class_name is the
-name of the class you want to load.
+ <div class="custom-index container"></div>
-.. note:: We use the terms "class" and "library" interchangeably.
+Application "Packages"
+======================
-For example, if you would like to send email with CodeIgniter, the first
-step is to load the email class within your controller::
+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.
- $this->load->library('email');
+The following is an example of a directory for an application package
+named "Foo Bar".
-Once loaded, the library will be ready for use, using
-$this->email->*some_method*().
+::
-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::
+ /application/third_party/foo_bar
- libraries/flavors/Chocolate.php
+ config/
+ helpers/
+ language/
+ libraries/
+ models/
-You will load it using::
+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.
- $this->load->library('flavors/chocolate');
+Package view files
+------------------
-You may nest the file in as many subdirectories as you want.
+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.
-Additionally, multiple libraries can be loaded at the same time by
-passing an array of libraries to the load method.
+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->library(array('email', 'table'));
+ $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
-Setting options
----------------
+ // Reset things
+ $this->load->remove_package_path(APPPATH.'my_app');
-The second (optional) parameter allows you to optionally pass
-configuration setting. You will typically pass these as an array::
+ // 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
- $config = array (
- 'mailtype' => 'html',
- 'charset' => 'utf-8,
- 'priority' => '1'
- );
+***************
+Class Reference
+***************
- $this->load->library('email', $config);
+.. class:: CI_Loader
-Config options can usually also be set via a config file. Each library
-is explained in detail in its own page, so please read the information
-regarding each one you would like to use.
+ .. method:: library($library[, $params = NULL[, $object_name = NULL]])
-Please take note, when multiple libraries are supplied in an array for
-the first parameter, each will receive the same parameter information.
+ :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 $object_name: Optional object name to assign the library to
+ :returns: void
-Assigning a Library to a different object name
-----------------------------------------------
+ This method is used to load core classes.
-If the third (optional) parameter is blank, the library will usually be
-assigned to an object with the same name as the library. For example, if
-the library is named Calendar, it will be assigned to a variable named
-$this->calendar.
+ .. note:: We use the terms "class" and "library" interchangeably.
-If you prefer to set your own class names you can pass its value to the
-third parameter::
+ 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('calendar', '', 'my_calendar');
+ $this->load->library('email');
- // Calendar class is now accessed using:
- $this->my_calendar
+ Once loaded, the library will be ready for use, using ``$this->email``.
-Please take note, when multiple libraries are supplied in an array for
-the first parameter, this parameter is discarded.
+ 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::
-$this->load->driver('parent_name', $config, 'object name')
-==========================================================
+ libraries/flavors/Chocolate.php
-This method is used to load driver libraries. Where parent_name is the
-name of the parent class you want to load.
+ You will load it using::
-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->library('flavors/chocolate');
- $this->load->driver('session');
+ You may nest the file in as many subdirectories as you want.
-Once loaded, the library will be ready for use, using
-$this->session->*some_method*().
+ Additionally, multiple libraries can be loaded at the same time by
+ passing an array of libraries to the load method.
+ ::
-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.
+ $this->load->library(array('email', 'table'));
-Additionally, multiple driver libraries can be loaded at the same time by
-passing an array of drivers to the load method.
+ Setting options
+ ---------------
-::
+ The second (optional) parameter allows you to optionally pass
+ configuration setting. You will typically pass these as an array::
- $this->load->driver(array('session', 'cache'));
+ $config = array (
+ 'mailtype' => 'html',
+ 'charset' => 'utf-8,
+ 'priority' => '1'
+ );
-Setting options
----------------
+ $this->load->library('email', $config);
-The second (optional) parameter allows you to optionally pass
-configuration settings. You will typically pass these as an array::
+ 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.
- $config = array(
- 'sess_driver' => 'cookie',
- 'sess_encrypt_cookie' => true,
- 'encryption_key' => 'mysecretkey'
- );
+ Please take note, when multiple libraries are supplied in an array for
+ the first parameter, each will receive the same parameter information.
- $this->load->driver('session', $config);
+ Assigning a Library to a different object name
+ ----------------------------------------------
-Config options can usually also be set via a config file. Each library
-is explained in detail in its own page, so please read the information
-regarding each one you would like to use.
+ If the third (optional) parameter is blank, the library will usually be
+ assigned to an object with the same name as the library. For example, if
+ the library is named Calendar, it will be assigned to a variable named
+ ``$this->calendar``.
-Assigning a Driver to a different object name
----------------------------------------------
+ If you prefer to set your own class names you can pass its value to the
+ third parameter::
-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``.
+ $this->load->library('calendar', NULL, 'my_calendar');
-If you prefer to set your own class names you can pass its value to the
-third parameter::
+ // Calendar class is now accessed using:
+ $this->my_calendar
- $this->load->library('session', '', 'my_session');
+ Please take note, when multiple libraries are supplied in an array for
+ the first parameter, this parameter is discarded.
- // Session class is now accessed using:
- $this->my_session
+ .. method:: driver($library[, $params = NULL[, $object_name]])
-.. note:: Driver libraries may also be loaded with the ``library()`` method,
- but it is faster to use ``driver()``.
+ :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 $object_name: Optional object name to assign the library to
+ :returns: void
-$this->load->view('file_name', $data, TRUE/FALSE)
-=================================================
+ This method is used to load driver libraries, acts very much like the
+ ``library()`` method.
-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.
+ As an example, if you would like to use sessions with CodeIgniter, the first
+ step is to load the session driver within your controller::
-The first parameter is required. It is the name of the view file you
-would like to load.
+ $this->load->driver('session');
-.. note:: The .php file extension does not need to be specified unless
- you use something other than .php.
+ Once loaded, the library will be ready for use, using ``$this->session``.
-The second **optional** parameter can take an associative array or an
-object as input, which it runs through the PHP
-`extract() <http://www.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.
+ 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.
-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::
+ Additionally, multiple driver libraries can be loaded at the same time by
+ passing an array of drivers to the load method.
+ ::
- $string = $this->load->view('myfile', '', true);
+ $this->load->driver(array('session', 'cache'));
-$this->load->model('model_name');
-==================================
+ Setting options
+ ---------------
-::
+ The second (optional) parameter allows you to optionally pass
+ configuration settings. You will typically pass these as an array::
- $this->load->model('model_name');
+ $config = array(
+ 'sess_driver' => 'cookie',
+ 'sess_encrypt_cookie' => true,
+ 'encryption_key' => 'mysecretkey'
+ );
+ $this->load->driver('session', $config);
-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::
+ 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.
- $this->load->model('blog/queries');
+ Assigning a Driver to a different object name
+ ---------------------------------------------
-If you would like your model assigned to a different object name you can
-specify it via the second parameter of the loading method::
+ If the third (optional) parameter is blank, the library will be assigned
+ to an object with the same name as the parent class. For example, if
+ the library is named Session, it will be assigned to a variable named
+ ``$this->session``.
- $this->load->model('model_name', 'fubar');
- $this->fubar->method();
+ If you prefer to set your own class names you can pass its value to the
+ third parameter::
-$this->load->database('options', TRUE/FALSE)
-============================================
+ $this->load->library('session', '', 'my_session');
-This method lets you load the database class. The two parameters are
-**optional**. Please see the :doc:`database <../database/index>`
-section for more info.
+ // Session class is now accessed using:
+ $this->my_session
-$this->load->vars($array)
-=========================
+ .. method:: view($view[, $vars = array()[, return = FALSE]])
-This method takes an associative array as input and generates
-variables using the PHP `extract <http://www.php.net/extract>`_
-method. This method produces the same result as using the second
-parameter of the ``$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.
+ :param string $view: View name
+ :param array $vars: An associative array of variables
+ :param bool $return: Whether to return the loaded view
+ :returns: mixed
-$this->load->get_var($key)
-==========================
+ This method is used to load your View files. If you haven't read the
+ :doc:`Views <../general/views>` section of the user guide it is
+ recommended that you do since it shows you how this method is
+ typically used.
-This method checks the associative array of variables available to
-your views. This is useful if for any reason a var is set in a library
-or another controller method using ``$this->load->vars()``.
+ The first parameter is required. It is the name of the view file you
+ would like to load.
-$this->load->get_vars()
-=======================
+ .. note:: The .php file extension does not need to be specified unless
+ you use something other than .php.
-This method retrieves all variables available to your views.
+ The second **optional** parameter can take an associative array or an
+ object as input, which it runs through the PHP
+ `extract() <http://www.php.net/extract>`_ function to convert to variables
+ that can be used in your view files. Again, read the
+ :doc:`Views <../general/views>` page to learn how this might be useful.
-$this->load->helper('file_name')
-================================
+ 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::
-This method loads helper files, where file_name is the name of the
-file, without the _helper.php extension.
+ $string = $this->load->view('myfile', '', TRUE);
-$this->load->file('filepath/filename', TRUE/FALSE)
-==================================================
+ .. method:: vars($vars[, $val = ''])
-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 true (boolean) it will instead return the data as a
-string.
+ :param mixed $vars: An array of variables or a single variable name
+ :param mixed $val: Optional variable value
+ :returns: void
-$this->load->language('file_name')
-==================================
+ This method takes an associative array as input and generates
+ variables using the PHP `extract() <http://www.php.net/extract>`_
+ function. This method produces the same result as using the second
+ parameter of the ``$this->load->view()`` method above. The reason you
+ might want to use this method independently is if you would like to
+ set some global variables in the constructor of your controller and have
+ them become available in any view file loaded from any method. You can
+ have multiple calls to this method. The data get cached and merged
+ into one array for conversion to variables.
-This method is an alias of the :doc:`language loading
-method <language>`: ``$this->lang->load()``
+ .. method:: get_var($key)
-$this->load->config('file_name')
-================================
+ :param string $key: Variable name key
+ :returns: mixed
-This method is an alias of the :doc:`config file loading
-method <config>`: ``$this->config->load()``
+ 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 ``$this->load->vars()``.
-Application "Packages"
-======================
+ .. method:: get_vars()
-An application package allows for the easy distribution of complete sets
-of resources in a single directory, complete with its own libraries,
-models, helpers, config, and language files. It is recommended that
-these packages be placed in the application/third_party directory. Below
-is a sample map of an package directory
+ :returns: array
-Sample Package "Foo Bar" Directory Map
-======================================
+ This method retrieves all variables available to your views.
-The following is an example of a directory for an application package
-named "Foo Bar".
+ .. method:: model($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: void
- /application/third_party/foo_bar
+ ::
- config/
- helpers/
- language/
- libraries/
- models/
+ $this->load->model('model_name');
-Whatever the purpose of the "Foo Bar" application package, it has its
-own config files, helpers, language files, libraries, and models. To use
-these resources in your controllers, you first need to tell the Loader
-that you are going to be loading resources from a package, by adding the
-package path.
-$this->load->add_package_path()
----------------------------------
+ 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::
-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->model('blog/queries');
- $this->load->add_package_path(APPPATH.'third_party/foo_bar/');
- $this->load->library('foo_bar');
+ If you would like your model assigned to a different object name you can
+ specify it via the second parameter of the loading method::
-$this->load->remove_package_path()
-------------------------------------
+ $this->load->model('model_name', 'fubar');
+ $this->fubar->method();
-When your controller is finished using resources from an application
-package, and particularly if you have other application packages you
-want to work with, you may wish to remove the package path so the Loader
-no longer looks in that directory for resources. To remove the last path
-added, simply call the method with no parameters.
+ .. method:: database([$params = ''[, $return = FALSE[, $query_builder = NULL]]])
-$this->load->remove_package_path()
-------------------------------------
+ :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: mixed
-Or to remove a specific package path, specify the same path previously
-given to add_package_path() for a package.::
+ This method lets you load the database class. The two parameters are
+ **optional**. Please see the :doc:`database <../database/index>`
+ section for more info.
- $this->load->remove_package_path(APPPATH.'third_party/foo_bar/');
+ .. method:: dbforge([$db = NULL[, $return = FALSE]])
-Package view files
-------------------
+ :param object $db: Database object
+ :param bool $return: Whether to return the Database Forge instance
+ :returns: mixed
-By Default, package view files paths are set when add_package_path()
-is called. View paths are looped through, and once a match is
-encountered that view is loaded.
+ Loads the :doc:`Database Forge <../database/forge>` class, please refer
+ to that manual for more info.
-In this instance, it is possible for view naming collisions within
-packages to occur, and possibly the incorrect package being loaded. To
-ensure against this, set an optional second parameter of FALSE when
-calling add_package_path().
+ .. method:: dbutil([$db = NULL[, $return = FALSE]])
-::
+ :param object $db: Database object
+ :param bool $return: Whether to return the Database Utilities instance
+ :returns: mixed
- $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
+ Loads the :doc:`Database Utilities <../database/utilities>` class, please
+ refer to that manual for more info.
- // Reset things
- $this->load->remove_package_path(APPPATH.'my_app');
+ .. method:: helper($helpers)
- // 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 \ No newline at end of file
+ :param mixed $helpers: Helper name as a string or an array containing multiple helpers
+ :returns: void
+
+ This method loads helper files, where file_name is the name of the
+ file, without the _helper.php extension.
+
+ .. method:: file($path[, $return = FALSE])
+
+ :param string $path: File path
+ :param bool $return: Whether to return the loaded file
+ :returns: mixed
+
+ This is a generic file loading method. Supply the filepath and name in
+ the first parameter and it will open and read the file. By default the
+ data is sent to your browser, just like a View file, but if you set the
+ second parameter to boolean TRUE it will instead return the data as a
+ string.
+
+ .. method:: language($files[, $lang = ''])
+
+ :param mixed $files: Language file name or an array of multiple language files
+ :param string $lang: Language name
+ :returns: void
+
+ This method is an alias of the :doc:`language loading
+ method <language>`: ``$this->lang->load()``.
+
+ .. 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 $fail_gracefully: Whether to just return FALSE in case of failure
+ :returns: bool
+
+ This method is an alias of the :doc:`config file loading
+ method <config>`: ``$this->config->load()``
+
+ .. method:: add_package_path($path[, $view_cascade = TRUE])
+
+ :param string $path: Path to add
+ :param bool $view_cascade: Whether to use cascading views
+ :returns: void
+
+ 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/');
+ $this->load->library('foo_bar');
+
+ .. method:: remove_package_path([$path = ''])
+
+ :param string $path: Path to remove
+ :returns: void
+
+ 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.::
+
+ $this->load->remove_package_path(APPPATH.'third_party/foo_bar/');
+
+ .. method:: get_package_paths([$include_base = TRUE])
+
+ :param bool $include_base: Whether to include BASEPATH
+ :returns: array
+
+ Returns all currently available package paths. \ No newline at end of file