Shulou(Shulou.com)06/03 Report--

This article mainly introduces the CodeIgniter extension core class example analysis, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let Xiaobian take you to understand.

The details are as follows:

It is quite convenient to extend core classes, auxiliary classes and functions in CI. The subclass_prefix extension prefix is specified in the configuration file, and the default MY_, extension needs to be prefixed with this configuration.

1. Extend the core class

The core classes are located under system/core, and most of them are loaded automatically at initialization time. There are two ways to extend core classes: replace core classes and inherit core classes.

Replace the core class

The core class is automatically replaced when a file with the same name as system/core exists in the application/core directory. Take Loader.php as an example. The class is loaded automatically when the application/core/Loader.php is created. Because this class is the core class of the system, an error will be reported if Loader.php does not implement the methods in the CI_Loader class, such as:

Class CI_Loader {...}

Replacing the core class requires rewriting all of its methods so as not to affect the core functionality. But most of the time, there is no need to rewrite the entire core, basically just to add some methods, this time can take the way of inheritance.

Inherit the core class

Inheriting the core class needs to be prefixed with subclass_prefix. For example, to extend the Input class, you need to create an application/core/MY_Input.php, and MY_Input needs to inherit the CI_Input class, such as:

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