PHP MYSQL PDO SUM of columns

Question

I\'m new to php and I\'ve searched for the past hour and read all the documentation I could find and nothing is helping. I have a table that has a bunch of rows of data. I\'

Answer 1

Try this if you are using a Class :

    class Sample_class{

        private $db;

        public function __construct($database) {
            $this->db = $database;
        }   

        public function GetDistant($user_id,$status) {

                    $query = $this->db->prepare("SELECT sum(distance) FROM trip_logs WHERE user_id =? AND status =?");

                    $query->bindValue(1, $user_id);
                    $query->bindValue(2, $status);

                    try{ $query->execute();     

                     $rows =  $query->fetch();
                     return $rows[0];

              } catch (PDOException $e){die($e->getMessage());}  
            } 
    }

$dist = new Sample_class($db);

$user_id = 10;
$status = 2;

echo $dist->GetDistant($user_id,$status);