You could be a bit more specific, i.e. add some explanation on what exactly you are trying to achieve.

As usual there are several approaches

• One way to do it is to inline the file in a HEREDOC, the variables will be interpolated. (Maybe not the most elegant solution but I used it to good effect in QED solutions :-)
• Another (better) option is to put certain tags (the variables) in the file, parse the file and replace the tags with meaningful values. You can create a temporary file containing the substituted values (let's say an "instantiation" of the template). I used this approach to generate XML files to request data from a system.
• Or use Template as suggested above.

Hope this helps

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