battles/podzem/edit.php

<?php
// Что ты такое?
use Battles\Database\Db;
use Battles\User;

require_once "../config.php";
if (!User::getInstance()->getAdmin()) {
    exit('Access denied!');
}
$nec = Db::getInstance()->fetchAll('select * from podzem2');

?>
<style>
    .row {
        cursor: default;
        border: 1px solid black;
    }

    .column {
        padding: 10px;
        float: left;
    }

    .left {
        width: 300px;
    }

    .right {
        width: 400px;
    }

    .row:after {
        content: "";
        display: table;
        clear: both;
    }
</style>
<div class="row">
    <div class="column left">
        <?php
        foreach ($nec as $row) {
            echo sprintf('<a href="edit_podzem.php?name=%s">%s</a><br>', $row['name'], $row['name']);
        }
        ?>
    </div>
    <div class="column right">
        <form action="" method="get">
            <?php if (empty($_GET['new'])): ?>
                <input name="new" type="submit" value="Создать новую">
                <?php
                if (!empty($_GET['news'] && !empty($_GET['name']))) {
                    $SQL2 = Db::getInstance()->execute('insert into podzem2 (name) value ?', $_GET['name']);
                    exit("<script>location.href='edit.php'</script>");
                } ?>
            <?php else: ?>
                <input style="font-size:12px;" name="name" type="text" size="10" value="Название">
                <input name="news" type="submit" value="Создать">
            <?php endif; ?>
        </form>
    </div>
</div>