How to use the c method in thinkphp

The c method in thinkphp is used to set, obtain, and save configuration parameters. Its usage syntax is such as "C('DB_NAME','thinkphp');", which means setting the value of the DB_NAME configuration parameter. for thinkphp.

#The operating environment of this article: Windows 7 system, thinkphp v5.1 version, Dell G3 computer.

How to use the c method in thinkphp?

Detailed explanation of ThinkPHP function: C method

C method is used by ThinkPHP The methods of setting, obtaining, and saving configuration parameters are frequently used.

To understand the C method, you need to first understand the configuration of ThinkPHP, because all operations of the C method are related to the configuration. ThinkPHP's configuration file is defined in PHP array format.

Due to the function overloading design, there are many usages. Let’s explain them one by one.

Set parameters

C('DB_NAME','thinkphp');

means setting the value of the DB_NAME configuration parameter to thinkphp. Since the configuration parameters are not case-sensitive, the following writing method is the same: [-more-]

C('db_name','thinkphp');

But it is recommended to keep the configuration definition specifications in uniform capital letters.

All parameters of the project can be dynamically changed through this method before taking effect. The last set value will overwrite the definition in the previous settings or conventional configuration. You can also use the parameter configuration method to add new configurations.

Supports the setting of secondary configuration parameters, for example:

C('USER.USER_ID',8);

It is not recommended that configuration parameters exceed the second level.

If you want to set multiple parameters, you can use batch settings, for example:

$config['user_id'] = 1;
$config['user_type'] = 1;
C($config);

If the first parameter of the C method is passed into the array, it means batch assignment. The above assignment is equivalent to:

C('USER_ID',1);
C('USER_TYPE',1);

[-more-]

Get parameters

To get the set parameters, you can use:

$userId = C('USER_ID');
$userType = C('USER_TYPE');

If the USER_ID parameter has not been defined, NULL will be returned.

It can also support obtaining secondary configuration parameters, for example:

$userId = C('USER.USER_ID');

If the incoming configuration parameters are empty, it means obtaining all parameters:

$config = C();

Save settings

Version 3.1 adds a function to permanently save setting parameters, which is only for batch assignment. For example:

$config['user_id'] = 1;
$config['user_type'] = 1;
C($config,'name');

After setting config parameters in batches, all current configuration parameters will be saved to the cache. file (or other configured caching method).

After saving, if you want to retrieve the saved parameters, you can use

$config = C('','name');

where name is the cache identifier used when saving the parameters earlier, and must be consistent to correctly retrieve the saved parameters. The retrieved parameters will be merged with the current configuration parameters, without manual merging.

Recommended learning: "PHP Video Tutorial" "The latest 10 thinkphp video tutorials"

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