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e834fed6eb
When saving the settings via the admin UI, the default value for any options not passed in the current `$_POST` request is set to `null` in `wp-admin/options.php`. Some options, e.g. `blog_public`, then rely on `null` being passed to `update_option()` to determine whether the value was changed or not.
This commit resolves a PHP 8.1 deprecation notice when saving the `gmt_offset` option without any changes:
{{{
Deprecated: preg_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated
}}}
Includes a similar fix for the `blog_charset` option.
Follow-up to [4112], [4329], [5541], [21849].
Props adi3890, dhrupo, hrdelwar, hasanmisbah, oglekler, mukesh27, SergeyBiryukov.
Fixes #57728.
git-svn-id: https://develop.svn.wordpress.org/trunk@56132 602fd350-edb4-49c9-b593-d223f7449a82