CodeIgniter study notes Item3--Super objects in CI

1. The load loader in the CI super object

The load loader is a CI_Loader type object, and the loader instance is obtained through

[code]$this->load

The loader provides different methods to load different objects:

model method: load a model

database method: load the database

view method: load the view

file method: load file

vars method: load variables

helper method: load auxiliary class

language method: load language file

config Method: Load the config file

. . . . . .

2. The uri in the CI super object

uri is a CI_Uri type object, obtained through

$this->uri

, used to process work with URLs, including from URLs Obtaining parameters, etc.

Passing get parameters through the URL often uses this form: http://localhost/study_codeIgniter/index.php/index/index2?id=5, but in the PHP framework, basically Use pathinfo, in the form like this: protocol://domain name/controller/method name/parameter name 1/parameter value 1/parameter name 2/parameter value 2, for example this URI: http://localhost/study_codeIgniter/index.php /index/test/id/5/name/jack

[code]index.php是入口文件

index表示index控制器

test表示控制器中的test方法

id表示第一个get传递的参数名是id

5是第一个参数的值

name表示第二个get传递的参数名是name

jack是第二个参数的值

If it is another framework, you can still call

$_GET[‘’]

## through the above pathinfo #To get the variable, but it cannot be used in CI, it will prompt that the id is undefined

In CI, you need to use the segment method of the uri object to get the parameter value , the actual parameter is the serial number of the parameter value in the URL, the serial number of the entry file is 0

For the above URL call

[code]$this->uri->segment(4)可以获得参数id的值

$this->uri->segment(6)可以获得参数name的值

Because of this, the parameter name does not actually need to be passed in the URL Pass the parameter value directly, and then obtain the parameter value according to the sequence number through segment. For example, the above URL can be modified like this: http://localhost/study_codeIgniter/index.php/index/test/5/jack. At this time,

The value of

$this->uri->segment(3)

is 5, and the value of

$this->uri->segment(4)

is jack. There is a simpler way to use the URL that omits the parameter name. This URL can be interpreted as a test that calls the index controller. Method, this method has two formal parameters, the value of the first parameter is 5, and the value of the second parameter is jack. At this time, you can access it directly through the passed in parameters

[code]public function test($id, $name)
{
    echo $id . "<br />" . $name;
}

3. Input input class in CI super object

Input is a CI_Input type object, obtained through $this->input, which provides a method to obtain user input information , for example:

post method: used to get the parameters passed through the post method

get method: used to get the parameters passed through the get method

post_get method: Used to get the parameters passed by the post or get method, giving priority to the post parameters

get_post method: used to get the parameters passed by the post or get method, giving priority to the get parameters

server method: Get the value in $_SERVER

cookie method: Get the value in $_COOKIE

set_cookie method: Set the cookie value

. . . . . .

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