Looking into the Theme Customizer API, it appears that theme modifications are stored as theme_mod
s which can be access using get_theme_mod( $mod_name )
or (if you want to grab them all) get_theme_mods()
.
Peeking into the source of get_theme_mods()
, I see that the mods are stored in the site's options
table as theme_mod_$mod_name
. So the theme modifications are stored in the database, not in any files.