Selamlar.

İsset ile veri kontrolü yapmanız gerekir.

<?php
$sor = $db->prepare("SELECT * FROM blog INNER JOIN blogkategori ON blog.kategori = blogkategori.id ORDER BY RAND() LIMIT 4");
$sor->execute();
$cek = $sor->fetchAll(PDO::FETCH_ASSOC);
$rowCount = $sor->rowCount();
?>

<div class="row gutter--15">
    <?php if ($rowCount > 0): ?>
        <?php if (isset($cek[0])): ?>
        <div class="col-md-6">
            <div class="post--item post--layout-1 post--title-larger">
                <div class="post--img">
                    <a title="<?php echo $cek[0]['kadi']; ?>" href="blog-details/<?php echo $cek[0]['seo']; ?>" class="thumb"><img src="/uploads/bloglar/<?php echo $cek[0]['kapak']; ?>" alt="<?php echo $cek[0]['adi']; ?>"></a>
                    <a title="<?php echo $cek[0]['kadi']; ?>" href="#" class="cat"><?php echo $cek[0]['kadi']; ?></a>
                    <div class="post--info">
                        <ul class="nav meta">
                            <li><a href="#"><?php echo $cek[0]['tarih']; ?></a></li>
                        </ul>
                        <div class="title">
                            <h2 class="h4">
                                <a href="blog-details/<?php echo $cek[0]['seo']; ?>" class="btn-link"><?php echo $cek[0]['adi']; ?></a>
                            </h2>
                        </div>
                    </div>
                </div>
            </div>
        </div>
        <?php endif; ?>

        <div class="col-md-6">
            <div class="row gutter--15">
                <?php if (isset($cek[1])): ?>
                <div class="col-xs-6 col-xss-12">
                    <div class="post--item post--layout-1 post--title-large">
                        <div class="post--img">
                            <a title="<?php echo $cek[1]['adi']; ?>" href="blog-details/<?php echo $cek[1]['seo']; ?>" class="thumb"><img src="/uploads/bloglar/<?php echo $cek[1]['kapak']; ?>" alt="<?php echo $cek[1]['adi']; ?>"></a>
                            <a title="<?php echo $cek[1]['kadi']; ?>" href="#" class="cat"><?php echo $cek[1]['kadi']; ?></a>
                            <div class="post--info">
                                <ul class="nav meta">
                                    <li><a href="#"><?php echo $cek[1]['tarih']; ?></a></li>
                                </ul>
                                <div class="title">
                                    <h2 class="h4">
                                        <a title="<?php echo $cek[1]['adi']; ?>" href="blog-details/<?php echo $cek[1]['seo']; ?>" class="btn-link"><?php echo $cek[1]['adi']; ?></a>
                                    </h2>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
                <?php endif; ?>

                <?php if (isset($cek[2])): ?>
                <div class="col-xs-6 hidden-xss">
                    <div class="post--item post--layout-1 post--title-large">
                        <div class="post--img">
                            <a title="<?php echo $cek[2]['adi']; ?>" href="blog-details/<?php echo $cek[2]['seo']; ?>" class="thumb"><img src="/uploads/bloglar/<?php echo $cek[2]['kapak']; ?>" alt="<?php echo $cek[2]['adi']; ?>"></a>
                            <a title="<?php echo $cek[2]['kadi']; ?>" href="#" class="cat"><?php echo $cek[2]['kadi']; ?></a>
                            <div class="post--info">
                                <ul class="nav meta">
                                    <li><a href="#"><?php echo $cek[2]['tarih']; ?></a></li>
                                </ul>
                                <div class="title">
                                    <h2 class="h4">
                                        <a title="<?php echo $cek[2]['adi']; ?>" href="blog-details/<?php echo $cek[2]['seo']; ?>" class="btn-link"><?php echo $cek[2]['adi']; ?></a>
                                    </h2>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
                <?php endif; ?>

                <?php if (isset($cek[3])): ?>
                <div class="col-sm-12 hidden-sm hidden-xs">
                    <div class="post--item post--layout-1 post--title-larger">
                        <div class="post--img">
                            <a title="<?php echo $cek[3]['adi']; ?>" href="blog-details/<?php echo $cek[3]['seo']; ?>" class="thumb"><img src="/uploads/bloglar/<?php echo $cek[3]['kapak']; ?>" alt=""></a>
                            <a title="<?php echo $cek[3]['kadi']; ?>" href="#" class="cat"><?php echo $cek[3]['kadi']; ?></a>
                            <div class="post--info">
                                <ul class="nav meta">
                                    <li><a href="#"><?php echo $cek[3]['tarih']; ?></a></li>
                                </ul>
                                <div class="title">
                                    <h2 class="h4">
                                        <a title="<?php echo $cek[3]['adi']; ?>" href="blog-details/<?php echo $cek[3]['seo']; ?>" class="btn-link"><?php echo $cek[3]['adi']; ?></a>
                                    </h2>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
                <?php endif; ?>
            </div>
        </div>
    <?php else: ?>
        <p>Gösterilecek blog yazısı bulunmamaktadır.</p>
    <?php endif; ?>
</div>

Bu kod isset ile veri kontrolü yapıp gerekli miktarda html satırını oluşturur.

Sevgiler.