[SOLVED] How can I get $_GET values to a variable

How can I get $_GET values to a variable

In my page, there are multiple $_GET values. ie

if(isset($_GET["projects"]))
{ .....    }
else if(isset($_GET["research"]))
{ ...... }
else if(isset($_GET["publication"]))
{ ..... }

...upto 10 elseif's

Can I shorten this? Can I get these values {projects,research, publication,..} in a variable.?

Solution

Ok so I guess I figured out what you want from your comments. Lets see.

$types = array('projects', 'research', 'publication'); // add as many as you want
$valid = array_intersect_key($_GET, array_flip($types));

if (count($valid) > 1)
    die "More than one category is set, this is invalid.";

if (!$valid)
    die "No category was set, you must choose one.";

foreach ($valid as $type => $value) // just to split this one element array key/value into distinct variables
{
    $value = mysql_real_escape_string($value); // assuming you are using mysql_*
    $sql = "SELECT * FROM table WHERE $type = '$value'";
}

...