How can the use of $this in PHP functions impact the execution and functionality of the code?

Using `$this` in PHP functions within a class context refers to the current object instance. However, if the function is called statically (without an object instance), using `$this` will result in a fatal error. To avoid this issue, you can use the `self::` keyword to access static properties or methods within the class. 

class MyClass {
    public static $staticProperty = 'Static Property';

    public static function staticFunction() {
        echo self::$staticProperty;
    }
}

MyClass::staticFunction(); // Output: Static Property

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$this PHP functions execution functionality code

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