Here-docs are just a convenient way of writing long strings, so (for example)
my_function(<<END, <<END . <<END);
a
END
b
END
c
END
is equivalent to
my_function("a\n", "b\n" . "c\n");
You can of course use different names, i.e.
my_function(<<A, <<B . <<C);
a
A
b
B
c
C
(well, that's not really sensible...)
Note that the here-docs must be in order, and start at the end of the line, i.e.
printf <<'END', 1, 2,
%d %d %d %d
END
3, 4;
prints
1 2 3 4.
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