Public bug reported:

There have been a number of microreleases of PHP 7.0 upstream since the
last update to Xenial (which corresponded to the merge in Yakkety). Ase
we have re-merged again in Zesty, it feels appropriate to provide
another MRE update to php7.0. A number of critical security and bug-
fixes are present in each 7.0.x. Rather than backporting individual
patches (e.g., Bug # 1569509), I believe it makes significantly more
sense to follow the upstream 7.0.x. Upstream PHP is demonstrating an
improved approach of bugfixes only in 7.0.x:

 - 7.0.15: http://php.net/ChangeLog-7.php

The upstream CI is at: https://travis-ci.org/php/php-src and is run
regularly.

Our php7.0 source package has autopkgtests for the 4 SAPIs, mod-php,
cgi, fpm and cli. We have also updated the packing to run the source
tests during the build itself.

I do not believe there is a firm statement from upstream on API/ABI
stability, but the general approach seems to be a BC-break would result
in 7.1.0.

Additionally for this SRU, there is (at least) one bug fixed upstream
that was specifically introduce by the prior SRU (to 7.0.13) which will
be fixed by updating to a newer upstream version: LP: #1658289.

I have also discussed this on IRC with the security team for
coordinating the next security update of php7.0.

** Affects: php7.0 (Ubuntu)
     Importance: Undecided
         Status: Fix Released

** Affects: php7.0 (Ubuntu Xenial)
     Importance: Undecided
         Status: New

** Affects: php7.0 (Ubuntu Yakkety)
     Importance: Undecided
         Status: New


** Tags: upgrade-software-version

** Changed in: php7.0 (Ubuntu)
       Status: New => Fix Released

** Also affects: php7.0 (Ubuntu Yakkety)
   Importance: Undecided
       Status: New

** Also affects: php7.0 (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Tags added: upgrade-software-version

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https://bugs.launchpad.net/bugs/1663405

Title:
  [SRU] microrelease exception for src:php7.0 (7.0.15)

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