CI Framework source code interpretation of the use of hook.php file to complete the function extension method, _php tutorial

CI Framework source code interpretation of the use of hook.php file to complete the function extension method,

This paper describes the method of using hook.php file to complete the function extension of CI framework. Share to everyone for your reference, as follows:

Read the source of the hook.php, we know that CI using hooks to expand the principle.

Basic knowledge of Hooks http://codeigniter.org.cn/user_guide/general/hooks.html

The use of hooks in CI has undergone a process of opening hooks, defining hooks, calling hooks, and executing hooks.

The method of opening, defining, and invoking is already informed in the manual. So what is the principle of hook implementation?

<?php if (! defined (' BasePath ')) exit (' No Direct script access allowed '); class Ci_hooks {var $enabled = FALSE; The flag that opens the hook is turned off by default. The configuration in apppath/config/config.php is also turned off by default, and if you want to use hooks, open them in config.php. var $hooks = array (); In the process of initializing the _initialize () function, an array of hooks defined in apppath/config/hook.php is referenced to $this->hooks; var $in _progress = FALSE; When a hook executes, it gives the token $in _process = TRUE to prevent the same hook from being invoked simultaneously.  function __construct () {$this->_initialize (); Log_message (' Debug ', ' Hooks Class Initialized '); } function _initialize () {//Initialize hook//Determine if Hook//include (hook.php) is turned on in config.php, reference the hook array defined in the file to $this->hooks//$t  his->enable = TRUE} function _call_hook ($which = ")//pre_system {//with Pre_system Hook Point as an example, when _call_hook (' Pre_system ') is called Make sure $this->enable = TRUE && defines $this->hooks[' Pre_system ')//if the two-dimensional array is traversed, _run_hook ($this->hooks[' Pre_system '] [$val])//If it is a one-dimensional array, then direct _run_hook ($this->hooks[' Pre_system ')} function _run_hook ($data)//$data is the array of hooks passed over {//$data we're in apppath/conf.ig/hook.php definition of the hook array//$hook [' pre_controller '] = array (//' class ' = ' MyClass ',//' function ' = ' Myfunction ',  ' filename ' = ' myclass.php ',//' filepath ' = ' hooks ',//' params ' = = Array (' Beer ', ' wine ', ' snacks ')//  );  Take out the data inside, load the APPPATH. $data [' filepath ']. $data [' filename ']; Instantiate the Hook class and invoke function.  The application to the example is $this->in_process = TRUE;  $Hook = new MyClass ();  $Hook->myfunction ($params);  $this->in_process = FALSE; }}?>

Hook points can hang multiple hooks, so when we want to extend CI, we just need to put the hook file into the AppPath folder and then declare the information of the defined hook in the apppath/config/hook.php. When the system runs to the hook point, it automatically invokes the declared hook.

This allows for scalability

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It is hoped that this article is helpful to the PHP program design based on CodeIgniter framework.

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