What are the advantages and disadvantages of using extends versus include, require, or autoload in PHP?

When deciding between using extends and include/require/autoload in PHP, it's important to consider the specific use case and requirements of your project. Extends is used in object-oriented programming to create a class that inherits properties and methods from another class, allowing for code reusability and easier maintenance. On the other hand, include, require, and autoload are used to include external PHP files in the current script, which can help modularize code and improve organization. Extends: 

class ParentClass {
    public function hello() {
        echo "Hello from ParentClass!";
    }
}

class ChildClass extends ParentClass {
    // ChildClass inherits the hello method from ParentClass
}

$child = new ChildClass();
$child->hello(); // Output: Hello from ParentClass!
```

Include:
```php
include 'external_file.php';
```

Require:
```php
require 'external_file.php';
```

Autoload:
```php
spl_autoload_register(function ($class_name) {
    include $class_name . '.php';
});

$object = new ClassName();

Keywords

extends include require autoload advantages disadvantages

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