Make test fails

[ptihiy]

I build and run make test, and a lot of failed tests I see...

PHP         : /usr/bin/php7.1 
PHP_SAPI    : cli
PHP_VERSION : 7.1.15-1+ubuntu16.04.1+deb.sury.org+2
ZEND_VERSION: 3.1.0
PHP_OS      : Linux - Linux sputnik 4.13.0-37-generic #42~16.04.1-Ubuntu SMP Wed Mar 7 16:03:28 UTC 2018 x86_64
INI actual  : /home/gooduser/code/php-memcached/tmp-php.ini
More .INIs  :   
CWD         : /home/gooduser/code/php-memcached
Extra dirs  : 
VALGRIND    : Not used

Number of tests :  137               120
Tests skipped   :   17 ( 12.4%) --------
Tests warned    :    1 (  0.7%) (  0.8%)
Tests failed    :    7 (  5.1%) (  5.8%)
Expected fail   :    0 (  0.0%) (  0.0%)
Tests passed    :  112 ( 81.8%) ( 93.3%)
---------------------------------------------------------------------
Time taken      :   21 seconds
=====================================================================

=====================================================================
FAILED TEST SUMMARY
---------------------------------------------------------------------
Memcached::getByKey() with CAS [tests/experimental/get_bykey_cas.phpt]
Memcached::set()/delete() UDP [tests/experimental/get_udp.phpt]
Memcached::getDelayedByKey() with CAS [tests/experimental/getdelayed_bykey_cas.phpt]
Memcached::getDelayedByKey() with callback exception [tests/experimental/getdelayed_cbthrows.phpt]
Memcached::getMulti() bad server [tests/experimental/getmulti_badserver.phpt]
Memcached::getStats() [tests/experimental/stats.phpt]
Memcached::getStats() with bad server [tests/experimental/stats_badserver.phpt]
=====================================================================

=====================================================================
WARNED TEST SUMMARY
---------------------------------------------------------------------
Memcached store, fetch & touch expired key [tests/expire.phpt] (warn: XFAIL section but test passes)
=====================================================================

You may have found a problem in PHP.

[sodabrew]

These work on Travis CI. I haven't looked closely to see why they fail locally, but I have observed this as well. I'm not going to spend any time looking at it, but will gladly review any PRs to improve the tests!