if( array_search($_GET['map'], $data) !== false ) {

$_GET['map'] :
 - int(2)

$data :

array(3) {
  [1]=>
  array(5) {
    ["Key_ID"]=>
    string(1) "1"
    ["title"]=>
    string(10) "County Map"
    ["image"]=>
    string(18) "interstate_map.jpg"
    ["link"]=>
    string(14) "county_map.pdf"
    ["order"]=>
    string(1) "1"
  }
  [2]=>
  array(5) {
    ["Key_ID"]=>
    string(1) "2"
    ["title"]=>
    string(27) "Charlotte/Columbia Area Map"
    ["image"]=>
    string(16) "location_map.jpg"
    ["link"]=>
    string(32) "charlotte_monstrose_columbia.pdf"
    ["order"]=>
    string(1) "2"
  }
  [3]=>
  array(5) {
    ["Key_ID"]=>
    string(1) "3"
    ["title"]=>
    string(13) "Charlotte MSA"
    ["image"]=>
    string(21) "charlotte_msa_map.jpg"
    ["link"]=>
    string(21) "charlotte_msa_map.pdf"
    ["order"]=>
    string(1) "3"
  }
}