What are the potential pitfalls of overwriting variables like $UserID in the PHP code, and how can this be avoided?

Overwriting variables like $UserID in PHP code can lead to unintended consequences, such as losing the original value or causing errors in the program. To avoid this, it is recommended to use unique variable names or prefix variables with a specific identifier to prevent conflicts.

// Avoid overwriting variables by using unique names or prefixes
$originalUserID = $UserID;