Significance of C, D, S in thinkphp

1. in the specific Action method, you can use C () to dynamically configure some parameters, mainly those that are not yet used. The usage is as follows:

1. in the specific Action method, you can use C () to dynamically configure some parameters, mainly those that are not yet used. The usage is as follows:

C ('parameter name'); // Obtain the set parameter value

C ('parameter name', 'New parameter value'); // you can specify a new value.

 

2. use of D () functions:

Define the model class, such as UserModel, and then use the D () function to operate the data. For example:

First, create a php script named UserModel. class. PHP under "your project" \ Lib \ Model. the content is as follows:

Class UserModel extends Model {}

Then, you can perform the following operations without adding any attributes and methods:

$ User = D ("User"); // instantiate the User object. User is a data table created in the database named "prefix _ user ".

You can also use $ User = new UserModel () instead to instantiate an object.

After instantiation, you can add, delete, query, modify, and perform a series of operations on the data, such:

$ User-> find (1); // query records whose primary key is 1

 

Use of the 3. S () function:

ThinkPHP abstracts various cache methods into uniform cache classes for calling, and ThinkPHP unifies all cache mechanisms into one S method for operations.

Different caching methods do not need to focus on specific cache details. For example:

S ('data', $ data); // use the Data identifier to cache $ data Data

S ('data', $ data, 3600); // cache $ Data for 3600 seconds

$ Data = S ('data'); // Obtain cached data