Boone Gorges daadd27ed4 Allow comment_exists() to match based on GMT date.
The `comment_date_gmt` field of the `wp_comments` table is indexed, which makes
`WHERE` matches against the field much faster than against the unindexed
`comment_date`. For bulk operations like data import, the speed difference can
be meaningful.

We continue to default to 'blog' for `$timezone`, to preserve compatibility
with existing uses.

Props apokalyptik.
Fixes #33871.

git-svn-id: https://develop.svn.wordpress.org/trunk@34460 602fd350-edb4-49c9-b593-d223f7449a82
2015-09-23 18:15:39 +00:00
2015-03-13 18:11:33 +00:00
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