警告：mysqli_select_db（）需要2个参数，给定0

Question

  2015-12-10,2015-12-11,2015-12-12,2015-12-13,2015-12-14

Answer 1

更改

$db = mysqli_select_db()($link, "users") or die("Couldn't select database: " . mysqli_connect_error());

到

$db = mysqli_select_db($link, DB_NAME) or die("Couldn't select database: " . mysqli_connect_error());

或者除去那条线并执行此操作：

$link = mysqli_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME) or die("Couldn't make connection.");