הטבעת ביטויים יחסיים במחרוזת Here-Document

  $string = <<"HERE_DOCUMENT";

     You can type all sorts of stuff in here....

     You can also $interpolate variables right into your h-d string.

     The here-document string will quit when it runs into the label

     given at its outset.

     HERE_DOCUMENT

$SQL = <<"EOT";

insert into my_table(my_column)

values ($dbh->quote($query->param('foo')))

EOT

$SQL = <<"EOT";

insert into my_table(my_column)

values (${ \($dbh->quote($query->param('foo'))) })

EOT