What is the potential impact of not properly deleting sensitive login information like $_PHP_AUTH_USER and $_PHP_AUTH_PW?

Not properly deleting sensitive login information like $_PHP_AUTH_USER and $_PHP_AUTH_PW can lead to security risks such as unauthorized access to sensitive user data. To solve this issue, it is essential to unset or destroy these variables after their use to ensure that the sensitive information is not stored in memory longer than necessary.

unset($_SERVER['PHP_AUTH_USER']);
unset($_SERVER['PHP_AUTH_PW']);