如何从SimpleXMLElement对象获取值

Question

我正在写这篇文章因为我试图解决一个似乎很愚蠢的问题，但不幸的是我无法做到。我有一个XML文件（链接），我正在解析simplexml_load_string（$ link），如下所示：

$response_xml_data = file_get_contents($link);
$xml = simplexml_load_string($response_xml_data);
foreach ($xml->item as $licenseElement) {
    $title = $licenseElement->title;
    echo $title;
}

我需要获得title和link的价值，但没有任何结果。

我尝试打印$link并告诉我：

SimpleXMLElement Object
    (
        [@attributes] => Array
            (
                [version] => 2.0
            )

        [channel] => SimpleXMLElement Object
            (
                [title] => GamePlay
                [link] => https://example.com/
                [description] => The latest blog posts from example.com.
                [language] => en-us
                [pubDate] => Mon, 14 Nov 2016 18:50:50 +0000
                [lastBuildDate] => Mon, 14 Nov 2016 18:50:50 +0000
                [managingEditor] => info@example.com
                [item] => SimpleXMLElement Object
                    (
                        [title] => IO Interactive 
                        [link] => http://example.com/?p=258
                    )

            )

    )

更新 当尝试var_dump（$ xml）;在循环之前：

object(SimpleXMLElement)#2568 (2) {
  ["@attributes"]=>
  array(1) {
    ["version"]=>
    string(3) "2.0"
  }
  ["channel"]=>
  object(SimpleXMLElement)#2571 (8) {
    ["title"]=>
    string(8) "Gameplay"
    ["link"]=>
    string(21) "https://example.com/"
    ["description"]=>
    string(40) "The latest blog posts from example.com."
    ["language"]=>
    string(5) "en-us"
    ["pubDate"]=>
    string(31) "Mon, 14 Nov 2016 19:08:33 +0000"
    ["lastBuildDate"]=>
    string(31) "Mon, 14 Nov 2016 19:08:33 +0000"
    ["managingEditor"]=>
    string(17) "info@example.com"
    ["item"]=>
    object(SimpleXMLElement)#2574 (2) {
      ["title"]=>
      string(76) "IO Interactive "
      ["link"]=>
      string(217) "http://example.com/?p=258"
    }
  }
}