Simple time function to calculate waiting time [closed]

Answer 1

do it in the sql query since you already have the arrival time in the DB

$query = "SELECT PatientID, Forename, Surname, Gender, Illness, Priority, Arrival_Time, TIMEDIFF(Arrival_time,NOW()) as Waiting_Time FROM Patient";

Also in your example above your only ever comparing now time to now time never actually comparing against Arrival_Time from your DB

Example modified version of your code

PatientID
Forename
Surname
Gender
Illness
Priority
Waiting Time
";

 while ($row = $result->fetch_object()){


  echo "
  " . $row[0] . "
  " . $row[1] . "
  " . $row[2] . "
  " . $row[3] . "
  " . $row[4] . "
  " . $row[5] . "
  " . $row[7] . "
  ";

}

echo "";
mysqli_close($conn);
?>