输出显示转义的引号

在屏蔽参数并将数据插入数据库后，quotaion被转义为'"，因此输出看起来很难看，如：hello this is an output test '"test '"
如何使引号正常显示

以下是我如何将数据插入数据库

if( $_POST )
{
   include "db.php";
    $title = $_POST['title'];
    $content = $_POST['content'];
    if(strlen($title) >= 77) { die('large_title'); };
    if(strlen($content) <= 19) { die('low_content'); };
    if(empty($title)) { $title = 'EMPTY00'; }
 $stmt = $mysqli->prepare("INSERT INTO na_posts(title,content) VALUES (?, ?)");
 $stmt->bind_param("ss",$title,$content);
 $stmt->execute();
 $stmt->close();
      $content = htmlspecialchars(mb_substr($content, 0, 125,'utf-8'));
      echo $content.'...';
} else { die('error'); }

这是我的输出代码：

$content = nl2br(htmlspecialchars($row->content));
echo $content;