Connecting to mysql

http://www.w3schools.com/php/php_mysql_insert.asp

////Example (MySQLi Procedural)
<?php
$servername = "localhost";
$username = "username";
$password = "password";
 
// Create connection
$conn = mysqli_connect($servername, $username, $password);
 
// Check connection
if (!$conn) {
    die("Connection failed: " . mysqli_connect_error());
} 
echo "Connected successfully";
 
 
 
//closing the connection 
Example (MySQLi Procedural)
mysqli_close($conn); 
 
 
// Example of inserting into a table
 
$sql = "INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('John', 'Doe', 'john@example.com')";
 
if ($conn->query($sql) === TRUE) {
    echo "New record created successfully";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}
?>