PHP include path problem with Horde on opensuse 42.3

Dear Horde list users,

already posted this on the opensuse list. just thought to also post it 
here to see if someone has some thoughts ;)

I got an openSUSE 42.3 box with PHP 7.0.7 and latest horde 5.2.21 with 
IMP, turba, passwd, etc ...

I installed horde via pear as described in the documents 
https://www.horde.org/apps/horde/docs/INSTALL
and all went smooth and fine.

the only problem I experience is the PHP include path in the php.ini in

/etc/php7/cli/php.ini
/etc/php7/apache/php.ini

the default setting is:

include_path = ".:/usr/share/php7:/usr/share/php7/PEAR"

but this throws a fatal error accessing horde via apache

HORDE: [horde] Error: Class 'PEAR_Config' not found in 
/usr/share/php7/PEAR/Horde/Core/Db/Migration.php:66

if i want to run horde-db-migrate via cli I get the same fatal error

cx20:# horde-db-migrate
PHP Fatal error:  Uncaught Error: Class 'PEAR_Config' not found in 
/usr/bin/horde-db-migrate:28

If I have a look at the php_dir in pear config all seems to look fine

cx20:~ # pear config-show
PEAR directory                 php_dir          /usr/share/php7/PEAR

but I still do get the fatal error!

only if I change the order (move the PEAR path to the front) of the 
include path in the php.ini things do work as they should

include_path = ".:/usr/share/php7/PEAR:/usr/share/php7"

which seems strange to me as PHP should try all the different include 
paths before throwing an error?

anyone here with a similar issue? perhaps someone can shed some light on 
what is going on here?
that would be nice

thanks & greetings
Becki
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