Запись в базу нескольких значений из массива

$start_times = array('07:00:00','08:00:00','09:00:00','10:00:00','11:00:00','12:00:00','13:00:00','14:00:00','15:00:00','16:00:00','17:00:00','18:00:00','19:00:00','20:00:00','21:00:00','22:00:00');
$end_times = array('08:00:00','09:00:00','10:00:00','11:00:00','12:00:00','13:00:00','14:00:00','15:00:00','16:00:00','17:00:00','18:00:00','19:00:00','20:00:00','21:00:00','22:00:00','23:00:00');

$i = 0;
    while ($i < count($start_times)):
        $time_start=$start_times[$i];
        $time_end=$end_times[$i];
        $sql = "INSERT INTO `wp_event_hours`(`event_id`, `weekday_id`, `start`, `end`, `category`) VALUES ('2830','1213','$time_start','$time_end','victor')";
        $i++;
    endwhile;

$i = 0; $sql = array ();
while ($i < count($start_times)):
    $time_start=$start_times[$i];
    $time_end=$end_times[$i];
    $sql[] = "('2830','1213','$time_start','$time_end','victor')";
    $i++;
endwhile;
mysql_query("INSERT INTO `wp_event_hours`(`event_id`, `weekday_id`, `start`, `end`, `category`) VALUES " . join(',', $sql));

for ($i=0; $i <count($start_times); $i++) {
    $time_start=$start_times[$i];
    $time_end=$end_times[$i]; 
    $array[]=("('2830','1213','$time_start','$time_end','$trainer')");
}
$comma_separated = implode(",", $array);
//echo $comma_separated;
$sql="INSERT INTO `wp_event_hours`(`event_id`, `weekday_id`, `start`, `end`, `category`) VALUES $comma_separated";