You can cause PHP to be processed on HTM and HTML pages by setting those extensions to be served by the PHP handler. You can enable PHP processing on .htm and .html in your .htaccess with the following directives:
AddHandler application/x-httpd-php php htm html AddType text/html php
Following the above example, if you wanted to process PHP on files with the extension .test, you could do so using:
AddHandler application/x-httpd-php php test AddType text/html php
You can find more information on AddHandler and AddType at Apache's website.
Note: We recommend using just the PHP extension for PHP pages.
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