PicoFeed\Filter\Attribute::secureIframeSrc PHP 메소드

    public function secureIframeSrc($tag, $attribute, &$value)
    {
        if ($tag === 'iframe' && $attribute === 'src' && strpos($value, 'http://') === 0) {
            $value = substr_replace($value, 's', 4, 0);
        }
        return true;
    }