echo
http://www.php.net/manual/html/function.echo.html
echo(string arg1, string [argn]...);
Outputs all parameters.
echo is not actually a function (it is a language construct) so you are
not required to use parantheses with it.
Example 1. echo example
echo "Hello World";

$text = "I'm a string !";
 echo ($text,$text,$text);

results into an error. The brackets may not be used.