Úprava textu s tagy v PHP - fatal error

$TEXT = str_replace("http:", "https:", $TEXT);

Fatal error</b>:  Uncaught exception 'PDOException' with message 'SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'SET Popis = '&lt;

$obrazekHTTPS = $answer['obrazek'];
              echo $answer['obrazek'];
$obrazekHTTPS = str_replace("http:", "https:", $obrazekHTTPS);

$answerPopis = str_replace("http:", "https:", $answer['Popis']);
//$answerPopis = str_replace('"', '\"', $answerPopis);
if ($answer['obrazek'] == $obrazekHTTPS)
{echo "yes";}
else {echo "no";
       echo $answerPopis;
echo $obrazekHTTPS;       
$modifikovano = date('Y-m-d');
echo $modifikovano;     echo "<br>____<hr>";
echo $id;

$https = $pdo->prepare("UPDATE clanky SET obrazek = ?, SET Popis = ?, SET modifikováno = ? WHERE ID = ?");
// Vykonání dotazu
$httpsRUN = $https->execute(array(
    $obrazekHTTPS, 
    $answerPopis,
    $modifikovano,
    $id
));    
     }  // echo $obrazekHTTPS;