PLIK INDEX.PHP
<?php
include 'config/db.php';
include 'config/portal.php';
if(array_key_exists('view',$_GET)){
    $views = $_GET['view'];
}
else {
    $views = 'mems';
}
$viewsFolder = 'views/' . $views . '.php';
if(file_exists($viewsFolder)){
    ob_start();
    include ($viewsFolder);
    $content = ob_get_contents();
    ob_end_clean();
    include ('layouts/main.php');
}
else {
    echo "404";
}
?>
<--------------------------------------->


PLIK mems.php 

<section id="mems">
<div class="container">
<div class="row">
<div class="col-lg-12 col-md-12">
<?php $engine= new Portal(); 
    $engine->showMems();
    ?>
</div>
</div>
</div>
</section>



<---------------------------->
PLIK Portal.php

class Portal {
    private $db;
    function __construct()
    {
       $user= 'root';
       $pass = '';
        $this->db = new PDO('mysql:host=localhost;dbname=mems', $user, $pass);
    }
    public function tekst(){
        echo "siemanko!";
    }
    public function showMems(){
        $query = $this->db->prepare('SELECT * FROM memy');
        $query->execute();
        $show = $query->fetchAll();
        foreach ($show as $value) {
        echo '<div class="card" style="width: 100%">';
           echo '<img src="images/img.jpg" class="card-img-top" alt="...">';
             echo '<div class="card-body">';
                 echo '<p class="card-text">'.$value['title']. '</p>';
                  echo '<p class="card-text">'.$value['content'].'</p>';
            echo '</div>';
        echo '</div>';
        }
    }
}