Description:
------------
NOWDOC/HEREDOC only allows PHP values such as those allowed within a quoted string.  Permitting PHP code (such as functions) within NOWDOC/HEREDOC will allow more flexibility for coding. Also, when using a text editor, syntax styling for PHP and syntax styling for another language specified by the NOWDOC/HEREDOC within the same file would be more readable as breaking apart the NOWDOC/HEREDOC for a function call would no longer be necessary.

In the below examples I would like to reemphasize the importance of:
- PHP code with PHP syntax styling
- SQL code with SQL syntax styling

$sql = <<<SQL
  SELECT <?= get_it(); ?> LIMIT 1
SQL;

Instead of:
$sql = <<<SQL
  SELECT 
SQL;
$sql .= get_it();
$sql .= <<<SQL
  LIMIT 1
SQL;

Reproduce code:
---------------
$sql = <<<SQL
  SELECT <?= get_it(); ?> LIMIT 1
SQL;


Expected result:
----------------
$sql = <<<SQL
  SELECT <?= get_it(); ?> LIMIT 1
SQL;


Actual result:
--------------
Does NOT run.