什么是PHP中的“<<< SQL”？ [重复]

Question

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What's this kind of syntax in PHP?
What is the name for the “<<<” operator?

In a example (specifically http://code.google.com/p/php-pdo-wrapper-class/) I've seen this:

$sql = <<<SQL
CREATE TABLE mytable (
    ID int(11) NOT NULL AUTO_INCREMENT,
    FName varchar(50) NOT NULL,
    LName varchar(50) NOT NULL,
    Age int(11) NOT NULL,
    Gender enum('male','female') NOT NULL,
    PRIMARY KEY (ID)
) ENGINE=MyISAM  DEFAULT CHARSET=latin1 AUTO_INCREMENT=11 ;
SQL;
$db->run($sql);

what is this syntax (I don't use php that much). I can't find anything on google because it skips the <<< thingy.

Answer 1

It's called heredoc syntax.