<?php
     class conexion {

    /**
    * Gestiona la conexión con la base de datos
    */

    private $dbhost = 'localhost';

    private $dbuser = 'nombre usuario';

    private $dbpass = 'contraseña';

    private $dbname = 'base de datos';

    public function conexion () {

    /**
    * @return object link_id con la conexión
    */

    $conn= new mysqli($this->dbhost,$this->dbuser,$this->dbpass,$this->dbname);

    if ($conn->connect_error) {

    echo "Error de Connexion ($conn->connect_errno)

    $conn->connect_errorn";

    header('Location: error-conexion.php');

    exit;

    } else {

    return $conn;

    }

    }

    } ?>

<?php


  $conn= new mysqli("localhost","root","","DB");

  if($conn){

  echo"conexion fail";
}else{

    echo"conexion success";
}

?>