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Can I safely update a theme if a user has only modified it through THEMES > CUSTOMIZED? I know that a user has to clone and create a child theme if they want to edit the php/css/javascript files directly. But, if the only modifications were through the THEMES > CUSTOMIZED, would there changes remain in place after a theme update?

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  • Maybe, why don't you pull the site down to a local development environment and test it? There's no way we can answer the question as is. – Andrew Bartel Apr 3 '14 at 16:29
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    Do you mean the customiser? I'm not aware of a 'customised' option – Tom J Nowell Apr 3 '14 at 16:30
  • Perhaps. I've added a screen shot to show how they are accessing it. – Rick Apr 3 '14 at 16:49
  • I'll play with the idea of exporting to a dev instance on a vagrant install. Good idea. – Rick Apr 3 '14 at 16:49
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Short answer: yes.

Long answer:

The Customize API uses one of two methods for storing customizations: the Settings API or the Theme Mods API (the latter being the default method). Thus, all changes are saved to the database, either as a Theme-defined option, or via theme_mods_{themeslug}.

When the Theme is updated, the Theme files in /wp-content/themes/{themeslug} are deleted and replaced, but the database entries in wp_options remain untouched.

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