In what situations would using parent::functionname() in the same function be beneficial?

When extending a class in PHP, the child class may need to override a method from the parent class but still call the parent class's implementation of that method. In such cases, using `parent::functionname()` within the child class's method allows you to access and execute the parent class's version of the method while still adding or modifying functionality in the child class.

class ParentClass {
    public function someMethod() {
        echo "Parent class method\n";
    }
}

class ChildClass extends ParentClass {
    public function someMethod() {
        parent::someMethod(); // Calls the parent class's method
        echo "Child class method\n";
    }
}

$child = new ChildClass();
$child->someMethod();
```

Output:
```
Parent class method
Child class method