/usr/share/php/ is in php-horde-support 2.1.5-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/Horde/
/usr/share/php/Horde/Support/
/usr/share/php/Horde/Support/ConsistentHash.php
/usr/share/php/Horde/Support/Inflector.php
/usr/share/php/Horde/Support/Backtrace.php
/usr/share/php/Horde/Support/Memory.php
/usr/share/php/Horde/Support/CaseInsensitiveArray.php
/usr/share/php/Horde/Support/Numerizer/
/usr/share/php/Horde/Support/Numerizer/Locale/
/usr/share/php/Horde/Support/Numerizer/Locale/Base.php
/usr/share/php/Horde/Support/Numerizer/Locale/Pt.php
/usr/share/php/Horde/Support/Numerizer/Locale/De.php
/usr/share/php/Horde/Support/Array.php
/usr/share/php/Horde/Support/Timer.php
/usr/share/php/Horde/Support/Guid.php
/usr/share/php/Horde/Support/Randomid.php
/usr/share/php/Horde/Support/StringStream.php
/usr/share/php/Horde/Support/CombineStream.php
/usr/share/php/Horde/Support/Stub.php
/usr/share/php/Horde/Support/Numerizer.php
/usr/share/php/Horde/Support/ObjectStub.php
/usr/share/php/Horde/Support/Stack.php
/usr/share/php/Horde/Support/Uuid.php
/usr/share/php/.registry/
/usr/share/php/.registry/.channel.pear.horde.org/
/usr/share/php/.registry/.channel.pear.horde.org/horde_support.reg