通过id更新表行中的值-PHP

Question

i am trying to increase the number value in a column called 'denda' every 24 hours followed by different starting date. For example if the date reach the current datetime so it start to count to 0.20 ..the next day should be 0.40. So the value should be different follow by starting date in a table.

this is my output

contohgambar

and this is my code

$pulang = mysql_query("SELECT id_peminjam, t_pinjam, t_pulang FROM peminjaman WHERE status='LEWAT'");
$pulang2 = mysql_fetch_array($pulang);
$id = $pulang2['id_peminjam'];
$id2 = $pulang2['t_pinjam'];
$id3 = $pulang2['t_pulang'];

"</br>";
date_default_timezone_set("Asia/Kuala_Lumpur");

$now = time(); 
$your_date = strtotime($id3);
$datediff = $now - $your_date;
$bil_lewat= floor($datediff/(60*60*24));

$jum_denda = ($bil_lewat * 0.20);

$format = number_format($jum_denda, 2, '.', '');

Answer 1

I think you can use MySQL statement to solve your problem. Add "DATEDIFF(CURDATE(),t_pulang)*0.2" into your SQL statement to calculate the difference between the dates. As following, MySQL 5.5 Date and Time Functions - datediff , MySQL NOW() Function

mysql_query("SELECT id_peminjam, t_pinjam, t_pulang, DATEDIFF(CURDATE(),t_pulang)*0.2 FROM peminjaman WHERE status='LEWAT'");

Answer 2

I user function on mysql found diff

example

select DATEDIFF( now(),t_pulang) datediff , DATEDIFF( now(),t_pulang) *0.20 jum_denda from peminjaman where status='LEWAT'

Answer 3

Thanks guy for replying .. You guys already give me the idea to use DATEDIFF ...although ..the DATEDIFF code only read the Ymd date format..it can't read dmY date format..so it is trouble me at first..until my friend decide to change the code like the code below.

$sql = mysql_query("SELECT isbn,id_peminjam,nama,judul,t_pinjam,t_hantar,t_pulang,status, DATEDIFF(CURDATE(),t_pulang)*0.2 As Differ FROM peminjaman WHERE status='LEWAT' LIMIT $posisi, $limit");
$no = $posisi + 1;
while ($data = mysql_fetch_array($sql)){ 
         $format = $data['Differ'];
         $denda = number_format($format, 2, '.', '');
    echo "
        <tr>
          <td align='center'><div class='style4'>&nbsp;$no</div></td>
          <td align='left'><div class='style4'>$data[nama]</div></td>
          <td align='center'><div class='style4'>&nbsp;$data[judul]</div></td>
          <td align='center'><div class='style4'>&nbsp;$data[t_pinjam]</div></td>
          <td align='center'><div class='style4'>&nbsp;$data[t_pulang]</div></td>
          <td align='center'><div class='style4'>&nbsp;$data[t_hantar]</div></td>
          <td align='center'><div class='style4'>&nbsp;$data[status]</div></td>
          <td align='center'><div class='style4'>&nbsp;RM $denda</div></td>
          <td align='center'>