How to check user by user name is exist in ldap server? I am using LDAP as my source for users. This works fine, and everyone can simply log in using their LDAP info, and it will create a Drupal user for that person.
However, one of our requirements is during user registration how to check this user already in ldap server or not , means is there any API by which i can check this user already in ldap server on user registration.
The LDAP module can handle that for you.