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author | Andrey Andreev <narf@devilix.net> | 2019-09-19 14:08:45 +0200 |
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committer | Andrey Andreev <narf@devilix.net> | 2019-09-19 14:08:45 +0200 |
commit | b73eb19aed66190c10c9cad476da7c36c271d6dc (patch) | |
tree | b3d5d4f960569c30701934416d6d51628bde81a7 /user_guide_src/source/general/hooks.rst | |
parent | 6e052d80b95b9332ed592cdc3431b5f9dc8dd250 (diff) |
[ci skip] 3.1.11 release
Diffstat (limited to 'user_guide_src/source/general/hooks.rst')
-rw-r--r-- | user_guide_src/source/general/hooks.rst | 127 |
1 files changed, 0 insertions, 127 deletions
diff --git a/user_guide_src/source/general/hooks.rst b/user_guide_src/source/general/hooks.rst deleted file mode 100644 index 6cc3407a3..000000000 --- a/user_guide_src/source/general/hooks.rst +++ /dev/null @@ -1,127 +0,0 @@ -#################################### -Hooks - Extending the Framework Core -#################################### - -CodeIgniter's Hooks feature provides a means to tap into and modify the -inner workings of the framework without hacking the core files. When -CodeIgniter runs it follows a specific execution process, diagramed in -the :doc:`Application Flow <../overview/appflow>` page. There may be -instances, however, where you'd like to cause some action to take place -at a particular stage in the execution process. For example, you might -want to run a script right before your controllers get loaded, or right -after, or you might want to trigger one of your own scripts in some -other location. - -Enabling Hooks -============== - -The hooks feature can be globally enabled/disabled by setting the -following item in the **application/config/config.php** file:: - - $config['enable_hooks'] = TRUE; - -Defining a Hook -=============== - -Hooks are defined in the **application/config/hooks.php** file. -Each hook is specified as an array with this prototype:: - - $hook['pre_controller'] = array( - 'class' => 'MyClass', - 'function' => 'Myfunction', - 'filename' => 'Myclass.php', - 'filepath' => 'hooks', - 'params' => array('beer', 'wine', 'snacks') - ); - -**Notes:** - -The array index correlates to the name of the particular hook point you -want to use. In the above example the hook point is pre_controller. A -list of hook points is found below. The following items should be -defined in your associative hook array: - -- **class** The name of the class you wish to invoke. If you prefer to - use a procedural function instead of a class, leave this item blank. -- **function** The function (or method) name you wish to call. -- **filename** The file name containing your class/function. -- **filepath** The name of the directory containing your script. - Note: - Your script must be located in a directory INSIDE your *application/* - directory, so the file path is relative to that directory. For example, - if your script is located in *application/hooks/*, you will simply use - 'hooks' as your filepath. If your script is located in - *application/hooks/utilities/* you will use 'hooks/utilities' as your - filepath. No trailing slash. -- **params** Any parameters you wish to pass to your script. This item - is optional. - -You can also use lambda/anoymous functions (or closures) as hooks, with -a simpler syntax:: - - $hook['post_controller'] = function() - { - /* do something here */ - }; - -Multiple Calls to the Same Hook -=============================== - -If want to use the same hook point with more than one script, simply -make your array declaration multi-dimensional, like this:: - - $hook['pre_controller'][] = array( - 'class' => 'MyClass', - 'function' => 'MyMethod', - 'filename' => 'Myclass.php', - 'filepath' => 'hooks', - 'params' => array('beer', 'wine', 'snacks') - ); - - $hook['pre_controller'][] = array( - 'class' => 'MyOtherClass', - 'function' => 'MyOtherMethod', - 'filename' => 'Myotherclass.php', - 'filepath' => 'hooks', - 'params' => array('red', 'yellow', 'blue') - ); - -Notice the brackets after each array index:: - - $hook['pre_controller'][] - -This permits you to have the same hook point with multiple scripts. The -order you define your array will be the execution order. - -Hook Points -=========== - -The following is a list of available hook points. - -- **pre_system** - Called very early during system execution. Only the benchmark and - hooks class have been loaded at this point. No routing or other - processes have happened. -- **pre_controller** - Called immediately prior to any of your controllers being called. - All base classes, routing, and security checks have been done. -- **post_controller_constructor** - Called immediately after your controller is instantiated, but prior - to any method calls happening. -- **post_controller** - Called immediately after your controller is fully executed. -- **display_override** - Overrides the ``_display()`` method, used to send the finalized page - to the web browser at the end of system execution. This permits you - to use your own display methodology. Note that you will need to - reference the CI superobject with ``$this->CI =& get_instance()`` and - then the finalized data will be available by calling - ``$this->CI->output->get_output()``. -- **cache_override** - Enables you to call your own method instead of the ``_display_cache()`` - method in the :doc:`Output Library <../libraries/output>`. This permits - you to use your own cache display mechanism. -- **post_system** - Called after the final rendered page is sent to the browser, at the - end of system execution after the finalized data is sent to the - browser.
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