Adjust the Travis CI matrix: PHP 7.0 and 7.1, fewer revisions of libmemcached

[sodabrew]

No description provided.

[sodabrew]

I actually don't know if the PHP 7 branch is capable of working with PHP 5.5 or 5.6. My hope would be to have a single php-memcached master branch and next release that works across the three supported revisions. Let's see how it goes.

[sodabrew]

With PHP < 7.0

In file included from php-memcached/msgpack-php/msgpack.c:16:0:
php-memcached/msgpack-php/php_msgpack.h:4:56: fatal error: Zend/zend_smart_str.h: No such file or directory

[TysonAndre]

The php7 branch targets php7 only. It won't compile under any version of php5.

If they are planning to have a master branch that targets master and php7, it is possible two ways (But they probably wouldn't do that until php7 was stable):

1. With a lot of macros and ifdefs (Doable for simple extensions that don't build complicated data structures. Makes understanding the code or writing php7 specific optimizations, such as switching to zend_string slightly harder in the future)
2. With separate source folders - This is what igbinary and solr do (E.g. Combine the php5 and php7 branches into one repo, in different folders igbinary/igbinary#62 )

• Move the php5 source code to a subfolder src/php5/
• Copy the source from the php7 branch to src/php7/
• Update package.xml
• Update src/php5 with the new features/api changes in php7.
• Update tests to work for both branches

[sodabrew]

I think the sane path forward is:

• Branch master to a stable-2.x that works with PHP 5.x. At this time, only PHP 5.6 remains supported upstream.
• Merge php7 to master (possibly rename master as stable-2.x and rename php7 as master).
• Add support for PHP 7.1 to the future php7 / master branch, since PHP 7.1 is in RC already.

[andrerom]

Is Precise still relevant for 3.0 (php7) code base? If it's not meant to be supported, and given tests fails with it, I wouldn't re-add it here.

[sodabrew]

PHP 7.1 compat for msgpack blocked on msgpack/msgpack-php#100

[sodabrew]

@laruence Ideally a fix for msgpack/msgpack-php#100 will land first so that I can remove my personal branch from this PR, if you have time could you merge msgpack/msgpack-php#104?