<?phpecho $_SERVER['HTTP_USER_AGENT'];?>
There are many types
of
variables available in PHP. In the above example we printed
an Array element.
Arrays can be very useful.
$_SERVER is just one variable that PHP
automatically
makes available to you. A list can be seen in the
Reserved Variables section
of the manual or you can get a complete list of them by looking at
the output of the phpinfo() function used in the
example in the previous section.
