Your syntax is wrong. Why are you putting all the condition inside brackets.
$id=(isset($_REQUEST['grants_id']) ? $_REQUEST['grants_id'] : '');
replace this line from the below line.
$id = (isset($_REQUEST['grants_id'])) ? $_REQUEST['grants_id'] : 0;
if($id > 0){
// your code
}
solved Making a delete.php file, code give me error