How to concatenate a backslash between two variables?

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I want to concatenate a backslash between two variables when passing them in the arguments of a function so they form a filepath.

turbo_function($variable1.\.$variable2, $otherargument);

I'm sure the backslash needs to be escaped. I've tried wrapping it in quotes and double quotes.

How can I concatenate the backslash to the variables successfully?

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