$mysqli = new mysqli("localhost","user","password","database");
$sql = "describe table";
$re=$mysqli->query($sql);
while( $row=$re->fetch_array()){
if($row['Key']=='PRI'){
ECHO $row['Field']."是這個表的主鍵。";
break;
}
}
>數組裏[key]=>PRI 的 就是主鍵
[Extra] => auto_increment 是自增字段