databases/php-memcached (3.0.0b1, moved from databases/php70-memcached) is a duplicate of databases/pecl-memcached (3.0.4). Since PHP flavor has been committed to the ports tree, PHP 7 users could use the packages of pecl-memcached instead of old php-memcached (which was hardcoded to php70).
According to bug #225720 comment 2 (remove databases/php70-memcached), I think this PR is approved.
A commit references this bug: Author: sunpoet Date: Sat Mar 10 23:01:49 UTC 2018 New revision: 464117 URL: https://svnweb.freebsd.org/changeset/ports/464117 Log: Remove databases/php-memcached PR: 226474 Submitted by: sunpoet (myself) Approved by: <townwear@gmail.com> (maintainer) Changes: head/MOVED head/databases/Makefile head/databases/php-memcached/
Committed. Thanks!