<div class="col-md-12">
    <div class="form-group col-md-6">

    <label>Manşet</label><br>
    <?php
    $satir = $db->query("SELECT * FROM haberler WHERE id=1")->fetch(PDO::FETCH_ASSOC);
    $manset = $satir['manset'];
    ?>

    <input type="radio" name="manset" value="0" <?php if($manset==0){ ?> checked="checked" <?php } ?>> <b style="color:red;">Bu haber manşette görünmesin.</b><br>
    <input type="radio" name="manset" value="1" <?php if($manset==1){ ?> checked="checked" <?php } ?>> <b style="color:green;">Bu haber manşette görünsün.</b>

    </div>
</div>