Staram się uzyskać prostą funkcję czasu, aby używać PHP do obliczania czasu oczekiwania pacjenta. Czas przybycia wprowadza się pomyślnie do tabeli pacjentów jako TIMESTAMP; tutaj jest fragment kodu;

// validate arrival time 

$date_time=date('Y-m-d H:i:sa');

clock time
date_default_timezone_set('Europe/London');
$the_time1 = date('G:ia');

czas oczekiwania (czas zegara - czas przyjazdu)

Jednak to nie działa w moim fragmencie kodu!

<?php

$conn = mysqli_connect("localhost","root","") or die ("No connection");
mysqli_select_db($conn, "a&e") or die('Could not select database.');

$query = "SELECT PatientID, Forename, Surname, Gender, Illness, Priority, Arrival_Time FROM Patient";
$result = mysqli_query($conn, $query) or die("Invalid query");

date_default_timezone_set('Europe/London');
$the_time1 = date('G:ia');
$date_time=date('Y-m-d H:i:sa');

echo Waiting_time($the_time1, $date_time); 

function waiting_time ( $the_time1, $date_time) {

$time_diff =  ( $the_time1, $date_time); {
$days      = floor( $time_diff / 86400 ); // 60 * 60 * 24 = number of seconds in a day
$time_diff -= $days * 86400;
$hours      = floor( $time_diff / 3600 ); // 60 * 60 = number of seconds in a hour
$time_diff -= $hours * 3600;
$mins       = floor( $time_diff / 60 ); // 60 = number of seconds in a minute

return( $days . ' days, ' . $hours . ' hours, ' . $mins . ' minutes' );

}


echo "<table border='1'>
<tr>
<th>PatientID</th>
<th>Forename</th>
<th>Surname</th>
<th>Gender</th>
<th>Illness</th>
<th>Priority</th>
<th>Waiting Time</th>
</tr>";

}
  echo "<tr>
  <td>" . $row[0] . "</td>
  <td>" . $row[1] . "</td>
  <td>" . $row[2] . "</td>
  <td>" . $row[3] . "</td>
  <td>" . $row[4] . "</td>
  <td>" . $row[5] . "</td>
  <td>" . $waitTime . "</td>
  </tr>";
  }
echo "</table>";
mysqli_close($conn);
?>

EDYTOWAĆ;

Teraz zmieniłem kod na ten;

<?php

$conn = mysqli_connect("localhost","root","") or die ("No connection");
mysqli_select_db($conn, "a&e") or die('Could not select database.');

$query = "SELECT PatientID, Forename, Surname, Gender, Illness, Priority, Arrival_Time as Waiting_Time FROM Patient";
$result = mysqli_query($conn, $query) or die("Invalid query");

date_default_timezone_set('Europe/London');

echo "<table border='1'>
<tr>
<th>PatientID</th>
<th>Forename</th>
<th>Surname</th>
<th>Gender</th>
<th>Illness</th>
<th>Priority</th>
<th>Waiting_Time</th>
</tr>";

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


  echo "<tr>
  <td>" . $row->PatientID . "</td>
  <td>" . $row->Forename . "</td>
  <td>" . $row->Surname . "</td>
  <td>" . $row->Gender . "</td>
  <td>" . $row->Illness . "</td>
  <td>" . $row->Priority . "</td>
  <td>" . $row->Waiting_Time . "</td>
  </tr>";

}

echo "</table>";
mysqli_close($conn);
?>

Wyświetlane są teraz następujące dane;

PatientID Forename Surname Gender Illness     Priority Waiting_Time 
249       Sara     Kearns  F      Immediate   high     2013-03-20 22:18:01

Potrzebuję czasu oczekiwania na wyświetlenie w godzinach, np. 1:15:23