DB_CONNETC (APDA)

<?php
// CONEXAO BANCO DE DADOS
$servername = "localhost";
$username = "root";
$password = " ";
$db_name =  "sistemalogin";

$connect = mysqli_connect($servername, $username, $password, $db_name);

if(mysqli_connect_error()):
   echo "Falha na conexão: ".mysqli_connect_error();
endif;

?>