Php $ CI = & amp; get_instance ();, phpci_PHP tutorial

Php $ CI & amp; get_instance ();, phpci. Php $ CIget_instance (); for php beginners of phpci, someone writes this, $ CIget_instance (); to access the original CodeIgniter resources in your custom class library, you must use get_instance () function php $ CI = & get_instance ();, phpci

Someone writes this in php for beginners, $ CI = & get_instance ();

To access the original CodeIgniter resources in your custom class library, you must use the get_instance () function. This function returns a CodeIgniter super object.

In general, you can use $ this to call any available CodeIgniter functions in your controller functions:

$ This-> load-> helper ('URL ');
$ This-> load-> library ('session ');
$ This-> config-> item ('base _ url ');
Etc.
$ This only applies to your own controllers, models, and views. when you want to use the original CodeIgniter class in a custom class, you can do this:

First, define the CodeIgniter object to assign a variable:

$ CI = & get_instance ();

Once an object is defined as a variable, you can replace $ this with the variable name:

$ CI = & get_instance ();

$ CI-> load-> helper ('URL ');
$ CI-> load-> library ('session ');
$ CI-> config-> item ('base _ url ');
Etc.
Note: You will notice that the get_instance () function is passed by reference:

$ CI = & get_instance ();

This is very important. assigning variables by referencing will use the original CodeIgniter object instead of creating a copy.

At the same time, please note: If you use php 4, it is best not to call get_instance () in the class constructor (). php4 has a problem when referencing the CI super object in the constructor, because the object exists only after the class is fully instantiated.

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