How can Google's indexing be affected by having domains and websites hosted by different providers in PHP?

Having domains and websites hosted by different providers in PHP can affect Google's indexing because it can lead to inconsistent server configurations and performance issues. To solve this problem, ensure that both domains and websites are hosted on reliable and well-configured servers to maintain consistent indexing by Google.

// Example PHP code snippet to ensure consistent indexing by Google
// Make sure to use reliable hosting providers for all domains and websites

// Code implementation here