What are the potential pitfalls of using $this outside of an object context in PHP?

When using `$this` outside of an object context in PHP, it will result in a fatal error as `$this` refers to the current object instance and can only be used within methods of a class. To solve this issue, you can either ensure that `$this` is only used within methods of a class or use a different variable to refer to the object instance when outside of a class.

class Example {
    public function doSomething() {
        // Use $this within a method
        echo "Doing something...";
    }
}

$example = new Example();
$example->doSomething(); // Output: Doing something...