$urunDurumu = implode(',',$_POST['urun_durumu']); // String dönderir

<form action="ayar/ayar.php" method="POST" enctype="multipart/form-data">
<div class="form-group row">
<label class="col-12 col-sm-3 col-form-label text-sm-right">Ürün Resmi</label>
<div class="col-12 col-sm-8 col-lg-6">
<input type="file" name="ürün_resmi" class="form-control">
</div>
</div>
<input type="hidden" class="form-control" name="ürün_resmi" value="<?php echo $_POST['site_logo'] ?>">
<div class="form-group row">
<label class="col-12 col-sm-3 col-form-label text-sm-right">Kategori Seç</label>
<div class="col-12 col-sm-8 col-lg-6">
<select name="kat_id" class="form-control">
<?php
$katrakam=1;
$katsor=$db->prepare("SELECT * FROM kategori ORDER BY id");
$katsor->execute();
while ($kate=$katsor->fetch(PDO::FETCH_ASSOC)) { $katrakam++; ?>
<option value="<?php echo $kate['id']; ?>"><?php echo $kate['kat_adi']; ?></option>
<?php } ?>
</select>
</div>
</div>

<div class="form-group row">
<label class="col-12 col-sm-3 col-form-label text-sm-right">Ürün Adı</label>
<div class="col-12 col-sm-8 col-lg-6">
<input type="text" name="ürün_adi" class="form-control">
</div>
</div>
<div class="form-group row">
<label class="col-12 col-sm-3 col-form-label text-sm-right">Ürün Detay</label>
<div class="col-12 col-sm-8 col-lg-6">
<input type="text" name="ürün_slogani" class="form-control">
</div>
</div>
<div class="form-group row">
<label class="col-12 col-sm-3 col-form-label text-sm-right">Seo URL</label>
<div class="col-12 col-sm-8 col-lg-6">
<input type="text" name="ürün_tag" class="form-control">
</div>
</div>
<div class="form-group row">
<label class="col-12 col-sm-3 col-form-label text-sm-right">Ürün Marka</label>
<div class="col-12 col-sm-8 col-lg-6">
<input type="text" name="ürün_marka" class="form-control">
</div>
</div>
<div class="form-group row">
<label class="col-12 col-sm-3 col-form-label text-sm-right">Ürün Kodu</label>
<div class="col-12 col-sm-8 col-lg-6">
<input type="text" name="ürün_kodu" class="form-control">
</div>
</div>
<div class="form-group row">
<label class="col-12 col-sm-3 col-form-label text-sm-right">Ürün Durumu</label>
<div class="col-12 col-sm-8 col-lg-6">
<select name="ürün_durumu" class="form-control">
<option value="Stokta Var">Stokta Var</option>
<option value="Stokta Yok">Stokta Yok</option>
</select>
</div>
</div>
<div class="form-group row">
<label class="col-12 col-sm-3 col-form-label text-sm-right">Ürün Açıklama</label>
<div class="col-12 col-sm-8 col-lg-6">
<input type="text" name="ürün_aciklama" class="form-control">
</div>
</div>
<div class="form-group row">
<label class="col-12 col-sm-3 col-form-label text-sm-right">Ürün Faydaları</label>
<div class="col-12 col-sm-8 col-lg-6">
<input type="text" name="ürün_faydalari" class="form-control">
</div>
</div>
<div class="form-group row text-right">
<div class="col col-sm-12 col-lg-12 offset-sm-12 offset-lg-12">
<center><button name="urnekle" type="submit" class="btn btn-space btn-info">Ekle</button></center>
</div>
</div>
                                    </form>