The `$HTTP_RAW_POST_DATA` global was deprecated in PHP 5.6 and removed completely in PHP 7.0. In general, `php://input` should be used instead of `$HTTP_RAW_POST_DATA`.
Because WordPress Core still supports PHP 5.6, some plugins or sites may still rely on this variable being present and populated with the expected data. For that reason, occurrences of the variable will remain with updated inline documentation until support for PHP 5.6 is officially dropped in WordPress.
Props skoskie, jrf, desrosj, TimothyBlynJacobs.
See #49922.
Fixes#49810.
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Use of `date()` in core depends on PHP timezone set to UTC and not changed by third party code (which cannot be guaranteed).
`gmdate()` is functionally equivalent, but is not affected by PHP timezone setting: it's always UTC, which is the exact behavior the core needs.
Props nielsdeblaauw, Rarst.
Fixes#46438. See #44491.
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John Blackbourn
desrosj
Sergey Biryukov
Scott Taylor