如何逃避已经在php中转义单引号的反斜杠？

So I have a script that creates a script that can then create another script. See below, I have written (how do I escape this) where I'm not sure what to do.

fwrite($file, ' 

                fwrite($file, \'

                                 fwrite($file, (how do i escape this)\' (how do i escape this)\'

\'
');
fclose;

I really hope that makes sense to someone!

To escape a backslash add another one:

echo " Escape \\";