This bug was fixed in the package php-horde-serialize - 2.0.5-1ubuntu1
--------------- php-horde-serialize (2.0.5-1ubuntu1) xenial; urgency=medium
* Update to PHP7.0 dependencies (LP: #1544352).
-- Nishanth Aravamudan <email address hidden> Thu, 24 Mar 2016 15:31:21 -0700
This bug was fixed in the package php-horde-serialize - 2.0.5-1ubuntu1
---------------
php-horde-serialize (2.0.5-1ubuntu1) xenial; urgency=medium
* Update to PHP7.0 dependencies (LP: #1544352).
-- Nishanth Aravamudan <email address hidden> Thu, 24 Mar 2016 15:31:21 -0700