What is the purpose of the "self()" function in PHP and how does it differ from using eval()?

The "self()" function in PHP is not a built-in function. If you meant to refer to the "self" keyword in PHP, it is used to access static properties and methods within a class. On the other hand, the "eval()" function in PHP is used to evaluate a string as PHP code. However, it is generally not recommended to use "eval()" due to security risks and potential performance issues.

class MyClass {
    public static $myProperty = 'Hello';

    public static function myMethod() {
        return self::$myProperty;
    }
}

echo MyClass::myMethod(); // Output: Hello