<?php
# Fill our vars and run on cli
# $ php -f db-connect-test.php
$dbname = 'database_name';
$dbuser = 'username';
$dbpass = 'password';
$dbhost = 'host';

$mysqli_connection = new MySQLi($dbhost, $dbuser, $dbpass, $dbname);
if ($mysqli_connection->connect_error) {
   echo "Not connected, error: " . $mysqli_connection->connect_error;
}
else {
   echo "Connected.";
}

?>