问题与mysqli功能

Question

我的页面显示此错误"mysqli_query() expects at least two parameters, one given on line $result=mysqli_query($connect);" 这是我的代码：

mysqli_query($connect,"SELECT 
*FROM $tbl_name WHERE phone    
='$phone' and        
password= '$password'");
$result=mysqli_query($connect);
$count=mysqli_num_rows  
($result);
if($count==1){
....}

Answer 1

你这样做了

mysqli_query($connect,"SELECT * FROM $tbl_name WHERE phone ='$phone' and  password= '$password'");
$result=mysqli_query($connect);

我想你想在变量中进行查询，然后使用该变量调用mysqli_query ..
所以正确的方法是：

$con = mysqli_connect("127.0.0.1", "my_user", "my_password", "my_db");  
$query = "SELECT * FROM $tbl_name WHERE phone ='$phone' and  password= '$password'";
mysqli_query($con, $query);

$con是您的连接字符串，$query是您的查询字符串