ThinkPHP functions of PHP functions

PHP is a scripting language widely used in Web development, and ThinkPHP is an MVC framework based on the PHP language. As one of the important technologies in web development, the learning and application of PHP functions and ThinkPHP functions are crucial in actual development.

PHP function is an encapsulated and reusable code block, usually used to complete a specific task. In the PHP language, calling and using functions is very simple. Just use the function name in the code, such as: echo "hello world"; is a very simple example of a PHP function.

So in the ThinkPHP framework, developers can use a large number of built-in functions and extension functions to manage data, control business logic, interact with databases, etc. Next, we will introduce some commonly used ThinkPHP functions and their usage.

1. M function

M function is ThinkPHP’s built-in database operation function, which can easily complete the interaction with the database. Using the M function, you can easily operate the database without having to understand the underlying code in depth.

Sample code:

$user = M('User');
$list = $user->where('id=1')->select();

In the above code, we use the M function to instantiate a data model named User, and filter the user with id 1 through the where method. Then, use the select method to obtain the user's information.

2. U function

The U function is a commonly used URL generation function in ThinkPHP, which is used to generate URL addresses corresponding to controllers and methods. Commonly used to generate website navigation, paging, process jumps and other functions.

Sample code:

$url = U('Index/index', array('id'=>1));

In the above code, we use the U function to generate a URL address pointing to the index method with an id value of 1 in the Index controller.

3. session function

The session function is a function built into PHP for managing session data, and can also be used directly in the ThinkPHP framework. It is often used to complete user login, operation permission verification, website data protection and other functions.

Sample code:

session('username', 'admin');
$username = session('username');

In the above code, we use the session function to store the username 'admin' in the session. Subsequently, the user name stored in the session is obtained through the session function.

4. C function

C function is a commonly used configuration reading function in the ThinkPHP framework. It can read the value of a certain configuration item in the specified configuration file. Configuration items can be database connection information, basic website parameters, third-party plug-in configuration, etc.

Sample code:

$config = C('database');

In the above code, we use the C function to read the database configuration item in the configuration file, that is, the database connection information.

5. cookie function

The cookie function is a function used to access browser cookies. A cookie is a small text file that stores information about the user. In the ThinkPHP framework, you can use the cookie function to easily manage cookies.

Sample code:

cookie('username', 'admin', 3600);
$username = cookie('username');

In the above code, we use the cookie function to store the user name 'admin' in the cookie and set the cookie validity period to 1 hour. Subsequently, the user name stored in the cookie is obtained through the cookie function.

6. show function

The show function is a template engine function used to display templates. Using the show function in the template can directly render a complete page.

Sample code:

echo T('Index/index');

In the above code, we use the show function to render the template pointing to the index method of the Index controller.

Summary

The learning and application of PHP functions and ThinkPHP functions require mastering certain programming basics and framework knowledge. By understanding and using these functions, we can help us complete web development work more efficiently, bringing us great convenience and benefits in actual projects.

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