Warning: mysqli_select_db() expects exactly 2 parameters, 1 given in

Question

im a beginner and also a diploma student... i have created database using localhost... im having problem viewing my database... please help me... i hope u can help me with a

Answer 1

In Mysqli you have to pass two parameters. 
1) sql Connection
2) sql query
example : 
  <?php
// Connect to server and select database.
   $con=mysqli_connect("$host", "$username",        
  "$password","$db_name")or         die("cannot connect server "); 
   $name="abc";
   $email="abc@gmail.com";
   $sql="INSERT INTO $tbl_name(name, email)VALUES('$name','$email')";
   $result=mysqli_query($con,$sql);
   mysqli_close($con);
?>

Answer 2

If you check the php manual here: http://php.net/manual/fr/mysqli.select-db.php

You will see the function mysqli_select_db take two params in input.

bool mysqli_select_db ( mysqli $link , string $dbname )

So you should have

// Connect to server and select databse.
$conn = mysqli_connect($host, $username, $password) or die("cannot connect"); 
mysqli_select_db($conn, $db_name) or die("cannot select DB");

Answer 3

You dont need a separate function for select database in mysqli function,

The below method is more than enough to connect and select the database,

 // Connect to server and select databse.
    $conn = mysqli_connect($host, $username, $password,$db_name)or die("cannot connect"); 

doc: http://php.net/manual/en/mysqli.select-db.php