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Rachel Baker ea3b41d8e3 Feeds: Always return a valid timestamp for the Last-Modified header of comment or post feeds.
Fixes bug where an invalid Last-Modified value would be returned in feed requests for sites that had 0 items to return. Comment or post feeds will now return the current timestamp as the Last-Modified header value.  Example: a request for the comments feed for a site without any comments.

Replaced use of the local static variable `$cache_lastcommentmodified` to store the modified date in `get_lastcommentmodified()` with the Object Cache API.  The `get_lastcommentmodified()` function returns early if there is a cached value and returns `false` if there where no comments found. Introduced `_clear_modified_cache_on_transition_comment_status()` to flush the `lastcommentmodified` cache key when a comment enters or leaves approval status. In `get_lastpostmodified()` return early if there is a cached value and return `false` if there are no posts found.

Props swissspidy, rachelbaker, dllh, leobaiano.
Fixes #38027.

git-svn-id: https://develop.svn.wordpress.org/trunk@38925 602fd350-edb4-49c9-b593-d223f7449a82
2016-10-25 20:47:06 +00:00
src Feeds: Always return a valid timestamp for the Last-Modified header of comment or post feeds. 2016-10-25 20:47:06 +00:00
tests Feeds: Always return a valid timestamp for the Last-Modified header of comment or post feeds. 2016-10-25 20:47:06 +00:00
tools/i18n DOCS: Replace HTTP links with HTTPS. 2016-06-10 04:49:09 +00:00
.editorconfig Use HTTPS URLs for codex.wordpress.org. 2015-04-12 21:28:58 +00:00
.gitignore Revert [38401] after [38480]. 2016-09-06 18:12:09 +00:00
.jshintrc Build: Prevent non-breaking spaces from accidentally being inserted into JavaScript files. 2015-11-12 12:04:55 +00:00
.travis.yml Build/Test Tools: Ensure PHP 7.1 is tested on Travis. 2016-08-17 20:45:07 +00:00
Gruntfile.js Build/Test Tools: Allow Minimal Builds 2016-10-20 22:23:21 +00:00
package.json Build/Test: Bump Autoprefixer to 6.5.0 2016-09-30 17:33:57 +00:00
phpunit.xml.dist oEmbed: Remove the oEmbed provider unit tests. 2016-10-20 09:15:10 +00:00
wp-cli.yml Remove debug mode from WP-CLI by default, as it now outputs too much debugging information to be of use during normal development. 2015-11-28 18:36:06 +00:00
wp-config-sample.php Lightly clean up and improve inline documentation in wp-config-sample.php. 2015-05-10 00:05:30 +00:00
wp-tests-config-sample.php Tests: Use a minimal theme for tests. 2016-10-21 11:02:37 +00:00