WP Gurus… I need help!

OK,

I’ve got a function creating a random number: in this case placed in a variable called $number.

I want to do an include of a .txt file in my template, but have it called with the randum number appended to the end of the file name.

ie, if the random number = 1 then I want to include my_file1.txt, but if the random number = 2 I want to include my_file2.txt

I know how to do an include with a static file name, but am having trouble with the nuances of appending the random number.

Any help would be greatly appreciated!