Pehape

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>Ne petku ne, ja jsem v tom nevinne :(</title>
    </head>
    <body>
        <?php
        require_once 'trida.php';
        $trida = new trida();
        $skoly = $trida->selectAll();
        foreach ($skoly as $skola) {
            echo "<p>Nazev skoly: " . $skola['nazev'] . "<a href='detail.php?id=" . $skola['id'] . "'>Detail</a></p>";
        }
        ?>
    </body>
</html>

-------------------- TŘÍDA

<?php

class trida {
    function __construct() {}

        function selectAll() {
        $ukazVse = $this->connect()->prepare("SELECT * FROM `skoly`");
        $ukazVse->execute();
        return $ukazVse->fetchAll(PDO::FETCH_ASSOC);

    }

    function selectOne($id) {
        $ukazJeden = $this->connect()->prepare("SELECT * FROM `skoly` WHERE `id` = " . $id . "");
        $ukazJeden->execute();
                return $ukazJeden->fetchAll(PDO::FETCH_ASSOC);
    }

    function connect() {
        $dsn = "mysql:dbname=skola;host=localhost";
        $user = "root";
        $password = "";

        $conn = new PDO($dsn, $user, $password);
        return $conn;
    }

}

-------------------- DETAIL

<?php

require_once 'trida.php';
$trida = new trida();
if (isset($_GET["id"])) {
    $id = $_GET["id"];
    $sk = $trida->selectOne($id);

    foreach ($sk as $s) {
        if ($s["typ"] = "z") {
            $typ = "zakladni skola";
        } else if ($s["typ"] = "s") {
            $typ = "stredni skola";
        } else if ($s["typ"] = "v") {
            $typ = "vysoka skola";
        }

        echo "<p>Nazev skoly: " . $s['nazev'] . " Typ skoly: " . $typ . " Pocet zaku: " . $s['pocetZaku'] . "</p>";
    }
}