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oleibman
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A while back, Microsoft introduced changes to the default theme colors and fonts. We are adding support for this new theme so that users can use it easily on new spreadsheets if they wish. (It is already supported when using the Xlsx Reader to load an appropriate file.) The old theme was described by constants COLOR_SCHEME_2013_PLUS_NAME and COLOR_SCHEME_2013_PLUS; these are deprecated in favor of COLOR_SCHEME_2013_2022_NAME and COLOR_SCHEME_2013_2022. The new theme is described by constants COLOR_SCHEME_2023_PLUS_NAME and COLOR_SCHEME_2023_PLUS. PhpSpreadsheet's default theme remains COLOR_SCHEME_2007_2010, to avoid breaking changes. A third optional parameter `$spreadsheet` is added to setThemeColorName. If specified, the default font names for the theme will be applied to the default style for the spreadsheet. You can thus use the new theme with its relatively new default `Aptos Narrow` font. IMHO, that isn't necessarily a good choice, but it is available. MS stores the new font in a different location than other system fonts, and that can lead to portability problems, e.g. if your spreadsheet uses Aptos and you export it to Html, browsers will not be able to find the font and a substitute font will be used.