php mysql显示数据表字段 SHOW FIELDS

php mysql显示数据表字段 SHOW FIELDS

$mydbname=RepPostVar($_GET['mydbname']);
$mytbname=RepPostVar($_GET['mytbname']);
if(empty($mydbname)||empty($mytbname))
{
 printerror("ErrorUrl","history.go(-1)");
}
$form=$_GET['form'];
if(empty($form))
{
 $form='ebakchangetb';
}
$usql=$empire->query("use `$mydbname`");
$sql=$empire->query("SHOW FIELDS FROM `".$mytbname."`");