在插入查询之后...获取最后一个插入ID并更新行

After Insert query... fetch the last insert id and update the row

$insert = "INSERT INTO users($fields) VALUES ($data) ";
mysqli_query($con,$insert);
$last_id = mysqli_insert_id($con);
$update = "UPDATE users SET url = '".$last_id."' WHERE id = ".$last_id." ";
 mysqli_query($con,$update );