The ternary operator you posted acts like a single line if-else
as follows
if (isset($_REQUEST[LINKEDIN::_GET_TYPE])) {
$_REQUEST[LINKEDIN::_GET_TYPE] = $_REQUEST[LINKEDIN::_GET_TYPE];
} else {
$_REQUEST[LINKEDIN::_GET_TYPE] = '';
}
Which you could simplify as
if (!(isset($_REQUEST[LINKEDIN::_GET_TYPE]))) {
$_REQUEST[LINKEDIN::_GET_TYPE] = '';
}