(PHP 5, PHP 7 < 7.4.0)
ibase_delete_user — Delete a user from a security database
ibase_delete_user(resource $service_handle, string $user_name): bool
service_handleThe handle on the database server service.
user_nameThe login name of the user you want to delete from the database.
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https://www.php.net/manual/en/function.ibase-delete-user.php