mysqli_connect — Open a connection to a MySQL Server.
MySQL is a database system , it is used to connect MySQl server.
MySQL: It is free software to download and use it.
<?php $servername = "localhost"; $username = "root"; $password = ""; //server connection $connection = mysqli_connect($servername, $username, $password); if (!$connection) { die("Connection failed: " . mysqli_connect_error()); } echo "DB is connected!"; ?>