How to use php variables in html

How to use php variables in html if I make a page, php code is used in combination with the html language. for example, I use php code to get each value in the database, how can I display it in a text in html ???, & Lt ;? Php $ s = 'ABCD ';? & Gt; & lt; inputtype = textvalue = '& lt ;? How to use php variables in php html
If I make a page, php code and html language are used in combination. for example, I use php code to get each value in the database, how can I display it in a text file in html ???

------ Solution --------------------
$ S = 'abc ';
?>