The spec file should use php-pear-Net-LDAP3 name for consistency with other pear packages,It's not actually installed using pear, albeit originally that was the plan. It is not likely to happen at all.
For consistency with future versions of the package, it should be renamed to its canonical upstream for packaging:
http://pkgs.fedoraproject.org/cgit/rpms/php-kolab-net-ldap3.git/