Delete attribute values from current attributes (PHP 3 >= 3.0.8, PHP 4, PHP 5)
bool ldap_mod_del ( resource link_identifier, string dn, array entry )

如果成功则返回 TRUE,失败则返回 FALSE

This function removes attribute(s) from the specified dn. It performs the modification at the attribute level as opposed to the object level. Object-level deletions are done by the ldap_delete() function.