How do I execute a PHP file?

Anyway, if what you want is to execute PHP files and show them as .html in the address bar, an easiest solution would be using .php as normal, and write a rule in your .htaccess like this: What if i use PHP + HTML? which format should i use? I’m quite confused. My page has really short code based on PHP and there are many codes in HTML.
For More Information Please Refer:
https://stackoverflow.com/questions/11312316/how-do-i-add-php-code-file-to-html-html-files
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