[suspicious - maybe spam] Using heredocs

Hello, I've just tried using heredocs [1] for the first time, but I am receiving parse errors always on the very last line of my document. The error is caused by my heredocs. Am I using it correctly? When I replaced the heredoc with a string.. everything worked again. Here's my code with heredocs (and the lines before and after for context): /* Query the database */ $db_sql = <<<SQL

               SELECT  id, expiry, permissions
        FROM    tblStudents
        UNION ALL
        SELECT  id, expiry, permissions
        FROM    tblStaff;
              SQL;

$rs = $db_connection->execute($db_sql); Here's my code without heredocs (and the lines before and after for context) - this works fine: /* Query the database */ $db_sql = 'SELECT id, expiry, permissions FROM tblStudents UNION ALL SELECT id, expiry, permissions FROM tblStaff;'; $rs = $db_connection->execute($db_sql); What am I doing wrong? Are there any requirements to using heredocs? I'm using PHP4, Apache, Win XP. [1] <http://www.php.net/manual/en/language.types.string.php#language.types.string.syntax.heredoc> Thanks Tim