将 URL 查询字符串传递给 Javascript 函数

我正在尝试将查询字符串从URL传递到Javascript函数，但我所做的似乎没有任何工作。 我正在使用PHP来生成Javascript代码。

如果我有以下网址：

www.testing.com/?test=5

我希望该函数输出以下代码：

"googletag.pubads().setTargeting("test","5");', 'close');"

我尝试使用 echo $_GET["test"] 添加 PHP 代码，但它不是显示值，而是显示$_GET["test"] . 我甚至尝试在 Javascript 中创建一个自定义函数来获取 URL 查询字符串，当我尝试显示它时，它只输出变量名称，而不是值本身。 有谁知道我做错了什么，并有想法解决这个问题？

下面是函数：

function google_admanager_dfp_add_js($js = NULL, $type = 'slot') {
    static $ga_js = array();
    // add the js to a type
    if (isset($js) && isset($type)) {
        $ga_js[$type][] = $js;
        //add the init and service scripts the first time this is run
        if (!isset($ga_js['service'])) {
            if (variable_get('google_admanager_dfp_useasync', FALSE)) {
                google_admanager_dfp_add_js("var googletag = googletag || {};googletag.cmd = googletag.cmd || [];", 'service');
                google_admanager_dfp_add_js("(function() {var gads = document.createElement('script');gads.async = true;gads.type = 'text/javascript';var useSSL = 'https:' == document.location.protocol;gads.src = (useSSL ? 'https:' : 'http:') + '//www.googletagservices.com/tag/js/gpt.js';var node = document.getElementsByTagName('script')[0];node.parentNode.insertBefore(gads, node);})();", 'service');
                google_admanager_dfp_add_js("googletag.cmd.push(function() {", 'pre');
                google_admanager_dfp_add_js("googletag.enableServices(); });", 'close');
            } else {
                google_admanager_dfp_add_js('(function() {var useSSL = ''https:'' == document.location.protocol;var src = (useSSL ? ''https:'' : ''http:'') +''//www.googletagservices.com/tag/js/gpt.js'';document.write(''<scr'' + ''ipt src="'' + src + ''"></scr'' + ''ipt>'');})();', 'service');
                // set the close script to fetch the ads.
                if (isset($_GET["test"])) {
                    // Line in question is below ->
                    google_admanager_dfp_add_js('googletag.pubads().setTargeting("test","");', 'close');
                }
                google_admanager_dfp_add_js('googletag.pubads().enableSyncRendering();googletag.enableServices();', 'close');
            }
        }
        return;
    }