I could be mistaken , but are you refering to the HEREDOC syntax?
using HEREDOC you can specify , and have free control over HTML tags inside your php application without having to worry about single quotes and nasty parese errors due to not quoting properly.
http://us2.php.net/types.string
Basically , it doesnt even have to be called EOT , it could be called FOO , BAR , Or any other name you want to use.
Assign it to a variable like this ...
$output = <<<FOO
// do some html here
FOO;
Now , the html contents inside $output will be the exact HTML you entered , no need to worry about having to use single quotes , or different things you must do to use html inside php.
Hope that helps