How to call PHP method in other files?

In PHP, in order to reuse specific functions or code blocks in different files, these codes need to be encapsulated into functions or methods. This can achieve code reusability, modularity and ease of maintenance. There are many ways to call PHP methods in other files. The following will introduce several common methods, with specific code examples.

1. Use include files (include)

You can use the include statement to include code in other PHP files into the current file. In this way, methods defined in other files can be directly called in the current file.

Example:

// 1.php 文件中定义了一个方法
function sayHello() {
    echo "Hello, World!";
}

// 在 2.php 文件中通过 include 包含 1.php 文件，并调用 sayHello 方法
include '1.php';
sayHello();

2. Use include files (require)

In addition to include, you can also use require Contains files. The difference is that require generates a fatal error when including the file fails and stops execution of the current script.

Example:

// 1.php 文件中定义了一个方法
function sayHello() {
    echo "Hello, World!";
}

// 在 2.php 文件中通过 require 包含 1.php 文件，并调用 sayHello 方法
require '1.php';
sayHello();

3. Use namespace (namespace)

Namespace can help organize and manage code in PHP and avoid naming conflicts. You can use the same namespace in different files and use methods from that namespace in other files.

Example:

// 在 1.php 文件中定义了一个带命名空间的方法
namespace MyNamespace;
function sayHello() {
    echo "Hello, World!";
}

// 在 2.php 文件中引入命名空间，并调用 sayHello 方法
use MyNamespace;
MyNamespacesayHello();

4. Use object method call

If the required method is located in a class, you can instantiate an object of the class and call the object's method to use this method in other files.

Example:

// 1.php 文件中定义了一个类和方法
class MyClass {
    public function sayHello() {
        echo "Hello, World!";
    }
}

// 在 2.php 文件中实例化 MyClass 类，并调用 sayHello 方法
include '1.php';
$obj = new MyClass();
$obj->sayHello();

In summary, methods can be called in different PHP files through multiple methods such as including files, namespaces, and object method calls. These methods can help us improve code reusability and maintainability during project development.

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