如何用morphMany方法转义斜杠？

use Illuminate\Database\Eloquent\Model;

class Post extends Model
{
    public function comments()
    {
        return $this->morphMany('App\Comment', 'commentable');
    }
}

class Comment extends Model
{
    public function commentable()
    {
        return $this->morphTo();
    }
}

// 在控制器或其他地方使用
$post = Post::find(1);
$comments = $post->comments;

foreach ($comments as $comment) {
    $content = str_replace('/', '\\/', $comment->content);
    echo $content;
}