What is the best practice for assigning unique user IDs in LDAP using PHP?

When assigning unique user IDs in LDAP using PHP, it is best practice to generate a unique identifier for each user to ensure data integrity and avoid conflicts. One common approach is to use a combination of a prefix (such as "user_") and a unique identifier like a UUID or a timestamp. This helps to guarantee that each user ID is unique and easily distinguishable.

// Generate a unique user ID using a combination of prefix and timestamp
$prefix = "user_";
$userID = $prefix . uniqid();