What is the difference between highlighting HTML code in a .php file in VSCode?

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There is no difference in highlighting HTML code in a .php file compared to a .html file in VSCode. Both file types are recognized by VSCode and the highlighting for HTML code will be the same in both. However, .php files allow for the inclusion of PHP code within HTML, whereas .html files do not. In a .php file, the PHP code will typically be highlighted differently from the HTML code.