Unfortunately there seems to be a bug with occ and LDAP: it doesn´t work in 18. I have read that in Loginprocess this is a without effect (i can confirm) but with occ i looks like following:
Starting scan for user 5 out of 8 (Pu)
Exception during scan: Function ldap_control_paged_result() is deprecated
#0 [internal function]: OCA\Files\Command\Scan->exceptionErrorHandler()
#1 /usr/local/www/nextcloud/apps-pkg/user_ldap/lib/LDAP.php(310): call_user_func_array()
#2 /usr/local/www/nextcloud/apps-pkg/user_ldap/lib/LDAP.php(89): OCA\User_LDAP\LDAP->invokeLDAPMethod()
#3 [internal function]: OCA\User_LDAP\LDAP->controlPagedResult()
#4 /usr/local/www/nextcloud/apps-pkg/user_ldap/lib/Access.php(1125): call_user_func_array()
#5 /usr/local/www/nextcloud/apps-pkg/user_ldap/lib/Access.php(1129): OCA\User_LDAP\Access->OCA\User_LDAP{closure}()
#6 /usr/local/www/nextcloud/apps-pkg/user_ldap/lib/Access.php(1965): OCA\User_LDAP\Access->invokeLDAPMethod()
#7 /usr/local/www/nextcloud/apps-pkg/user_ldap/lib/Access.php(203): OCA\User_LDAP\Access->abandonPagedSearch()
#8 /usr/local/www/nextcloud/apps-pkg/user_ldap/lib/Group_LDAP.php(523): OCA\User_LDAP\Access->readAttribute()
#9 /usr/local/www/nextcloud/apps-pkg/user_ldap/lib/Group_LDAP.php(547): OCA\User_LDAP\Group_LDAP->getEntryGroupID()
#10 /usr/local/www/nextcloud/apps-pkg/user_ldap/lib/Group_LDAP.php(628): OCA\User_LDAP\Group_LDAP->getUserPrimaryGroupIDs()
#11 /usr/local/www/nextcloud/apps-pkg/user_ldap/lib/Group_LDAP.php(665): OCA\User_LDAP\Group_LDAP->getUserPrimaryGroup()
#12 /usr/local/www/nextcloud/apps-pkg/user_ldap/lib/Group_Proxy.php(125): OCA\User_LDAP\Group_LDAP->getUserGroups()
#13 /usr/local/www/nextcloud/lib/private/Group/Manager.php(283): OCA\User_LDAP\Group_Proxy->getUserGroups()
#14 /usr/local/www/nextcloud/lib/private/Group/Manager.php(270): OC\Group\Manager->getUserIdGroups()
#15 /usr/local/www/nextcloud/lib/private/Share20/DefaultShareProvider.php(900): OC\Group\Manager->getUserGroups()
#16 /usr/local/www/nextcloud/lib/private/Share20/Manager.php(1295): OC\Share20\DefaultShareProvider->getSharedWith()
#17 /usr/local/www/nextcloud/apps-pkg/files_sharing/lib/MountProvider.php(79): OC\Share20\Manager->getSharedWith()
#18 /usr/local/www/nextcloud/lib/private/Files/Config/MountProviderCollection.php(114): OCA\Files_Sharing\MountProvider->getMountsForUser()
#19 /usr/local/www/nextcloud/lib/private/Files/Filesystem.php(448): OC\Files\Config\MountProviderCollection->addMountForUser()
#20 /usr/local/www/nextcloud/lib/private/Files/Filesystem.php(377): OC\Files\Filesystem::initMountPoints()
#21 /usr/local/www/nextcloud/lib/private/legacy/util.php(310): OC\Files\Filesystem::init()
#22 /usr/local/www/nextcloud/lib/private/Files/Utils/Scanner.php(116): OC_Util::setupFS()
#23 /usr/local/www/nextcloud/lib/private/Files/Utils/Scanner.php(202): OC\Files\Utils\Scanner->getMounts()
#24 /usr/local/www/nextcloud/apps-pkg/files/lib/Command/Scan.php(151): OC\Files\Utils\Scanner->scan()
#25 /usr/local/www/nextcloud/apps-pkg/files/lib/Command/Scan.php(207): OCA\Files\Command\Scan->scanFiles()
#26 /usr/local/www/nextcloud/3rdparty/symfony/console/Command/Command.php(255): OCA\Files\Command\Scan->execute()
#27 /usr/local/www/nextcloud/core/Command/Base.php(168): Symfony\Component\Console\Command\Command->run()
#28 /usr/local/www/nextcloud/3rdparty/symfony/console/Application.php(915): OC\Core\Command\Base->run()
#29 /usr/local/www/nextcloud/3rdparty/symfony/console/Application.php(272): Symfony\Component\Console\Application->doRunCommand()
#30 /usr/local/www/nextcloud/3rdparty/symfony/console/Application.php(148): Symfony\Component\Console\Application->doRun()
#31 /usr/local/www/nextcloud/lib/private/Console/Application.php(214): Symfony\Component\Console\Application->run()
#32 /usr/local/www/nextcloud/console.php(99): OC\Console\Application->run()
#33 /usr/local/www/nextcloud/occ(11): require_once(’/usr/local/www/…’)
#34 {main}