Also fixes edge-case situation where $_SERVER['SERVER_PORT'] is not set for an HTTPS connection, this function would return an explicit port 80 i.e. ":80" rather than an empty string.

As per mailinglist-discussion, consent-stats were never processed by the statistics-module due to inconsistent logging:
https://groups.google.com/forum/#!topic/simplesamlphp/Gc97OeUox2k

Merge branch 'feature/pdo-options-support' of https://github.com/ElijahLynn/simplesamlphp into ElijahLynn-feature/pdo-options-support

authfacebook compatability with Facebook strict URI match

Replace deprecated create_function

The assignment to $stateID is dead and can be removed.

Call to undefined method Memcached::getExtendedStats()

Notice: Undefined index: libevent in modules/memcacheMonitor/templates/memcachestat.tpl.php on line 60

Per https://developers.facebook.com/docs/facebook-login/security/#strict_mode the
`state` parameter should be used for any state needed after the redirect, and the
redirect URI should remain constant.

Trailing slash is no longer required in baseurlpath as per 1.15.

Fix typo in variable name.

Fixes #656

This reverts commit 9ad60fe1.

Psalm is starting to get annoying. Both openssl_decrypt() and realpath() can return a string or false on error. Psalm seems to ignore the latter all of a sudden, so it assumes the returned variable will always be a string and then it fails when you check on errors. This fix explicitly declares the problematic variables with types string or false, so that psalm stops complaining.

MySQL key value store now handles NULL expiries.