Insert records to database using PHP

Today i am going to write a program to Insert records into the table in Database.

<?php

 $conn =mysqli_connect('servername','username','password','databasename');

 if(!$conn)
{
 die('Connection failed!'.mysqli_error($conn));
 }
$sql = "INSERT INTO tablename('sno','name','pwd') VALUES('101','Richy','Richy123')";
 
 if(mysqli_query($conn,$sql))
{ 
echo "Record Inserted";
 }
else
{ 
echo mysql_error();
}
?>
------------------------------------------------------------- Note: When we using XAMPP or WAMP, servername = localhost, username = root, password is empty.