我有这样的代码

[mt\\u ptcolumn size=“pricing-3-col”title=“brown”price=“$99”period=“1 domain”button=“Purchase”url=“\\；”]

我想在按钮“”中添加一个短代码，如下所示

[mt\\u ptcolumn size=“pricing-3-col”title=“brown”price=“99美元”period=“1域”button="[another-shortcode]" url=“#”]

但它不起作用。那么，我如何编辑下面的代码才能使其正常工作呢？

if (!function_exists(\'mt_ptcolumn\')) {
    function mt_ptcolumn($atts, $content = null) {
        extract(shortcode_atts(array(
            \'title\'     => \'Basic\',
            \'price\'     => \'$40\',
            \'period\'    => \'per month\',
            \'url\'       => \'#\',
            \'button\'    => \'Buy Now!\'
        ), $atts));

        $ptoutput =\'\';
        $ptoutput .= \'<div class="pt-column">\'."\\n";
        $ptoutput .= \'<h3>\'.$title.\'</h3>\'."\\n";
        $ptoutput .= \'<div id="tab_price" class="pt-cost"><p>\'.$price.\'<span>\'.$period.\'</span></p></div>\'."\\n";
        $ptoutput .= \'<div id="tab_btn" class="pt-cost"><a href="\'.$url.\'" class="mt-button large" style="margin-top:25px">\'.$button.\'</a></div>\'."\\n";
        $ptoutput .= \'<div class="pt-features">\'."\\n";
        $ptoutput .= do_shortcode($content);
        $ptoutput .= \'</div>\'."\\n";
        $ptoutput .= \'<div class="pt-buynow"><a href="\'.$url.\'" class="mt-button large">\'.$button.\'</a></div>\'."\\n";
        $ptoutput .= \'</div>\'."\\n";

        return $ptoutput;
    }
    add_shortcode(\'mt_ptcolumn\', \'mt_ptcolumn\');
}