<<< SQL和SQL是什么意思？ [重复]

What do the <<<SQL and the SQL mean?

    $query = <<<SQL

INSERT INTO comments
    ( content )
VALUES
    ( '$content' )

SQL;

    return mysql_query( $query ) or die( mysql_error() );
}

</div>

It's the heredoc syntax, another way to store multiline strings.

You can find it in many scripting languages.

In this case, it basically means same thing as this:

$query = "
INSERT INTO comments
    ( content )
VALUES
    ( '$content' )
";

More reading - http://www.php.net/manual/en/language.types.string.php#language.types.string.syntax.heredoc