Automatische update

<?php
  $dbres                = mysql_query("SELECT UNIX_TIMESTAMP(`time`) AS `time`,`name` FROM `cron`");
    while($x = mysql_fetch_object($dbres))
      $update[$x->name]        = $x->time;
          if(floor($update['day']/ 5) != floor(time()/ 5)) {
      $dbres                = mysql_query("SELECT GET_LOCK('day_update',0)");
      if(mysql_result($dbres,0) == 1) {
      mysql_query("UPDATE `cron` SET `time`=NOW() WHERE `name`='day'");
      mysql_query("DELETE FROM `aanbiedingen` WHERE id='".$_GET['verkocht']."'")or die(mysql_query());


mysql_query("SELECT RELEASE_LOCK('day_update')");
      }
      }
  ?>