What are the implications of using example.com as a placeholder domain in PHP scripts?

Using example.com as a placeholder domain in PHP scripts can lead to potential security risks, as it is a real domain that could potentially be registered by someone else. To avoid this issue, it is recommended to use a clearly fake domain such as example.test or example.invalid in your scripts.

// Use a clearly fake domain as a placeholder in PHP scripts
$placeholderDomain = "example.test";