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我有这个从谷歌 API 加载谷歌天气的 php 脚本。

<?php

      //Weather Forecast icon and temperature from google weather API

      $setYourLanguage = "en"; // Possibilities: "en" - english; "ru" - russian; "ka" - georgian;
      //WEATHER, read google XML weather forecast
      $URL = "http://www.google.com/ig/api?weather=".$myCity."&hl=".$setYourLanguage."";

      $dataInISO = file_get_contents($URL);
      $dataInUTF = mb_convert_encoding($dataInISO, "UTF-8", "ISO-8859-2"); //fix Google's API UTF-8 bug
      $xml = simplexml_load_string($dataInUTF); 

      $current = $xml->xpath("/xml_api_reply/weather/current_conditions");
      $iconData = str_replace("/ig/images/weather/", "weather/",  $current[0]->icon['data']);
      $iconData = str_replace(".gif", ".png", $iconData);

?>

但有时页面无法加载，我在 apache2 日志中收到错误：

[Thu Aug 23 12:04:16 2012] [error] [client ::1] PHP Warning:  simplexml_load_string(): Entity: line 1: parser error : Start tag expected, '<' not found in /Library/WebServer/Documents/wordpress/wp-content/themes/directorypress/homepage-structure.php on line 23
[Thu Aug 23 12:04:16 2012] [error] [client ::1] PHP Warning:  simplexml_load_string(): Unsupported API in /Library/WebServer/Documents/wordpress/wp-content/themes/directorypress/homepage-structure.php on line 23
[Thu Aug 23 12:04:16 2012] [error] [client ::1] PHP Warning:  simplexml_load_string(): ^ in /Library/WebServer/Documents/wordpress/wp-content/themes/directorypress/homepage-structure.php on line 23
[Thu Aug 23 12:04:16 2012] [error] [client ::1] PHP Fatal error:  Call to a member function xpath() on a non-object in /Library/WebServer/Documents/wordpress/wp-content/themes/directorypress/homepage-structure.php on line 25
[Thu Aug 23 12:05:57 2012] [error] [client ::1] What

任何想法为什么会发生这种情况？我的理论是它无法正确连接到 URL 并以这种方式失败......但是为什么页面加载停止了？有没有办法避免这个错误？并允许页面完全加载？

4

1 回答 1

1

如果 SimpleXml 无法加载 XML，则变量的值$xml是false而不是 type 的实例SimpleXMLElement。也就是说，错误消息所说的内容：

[Thu Aug 23 12:04:16 2012] [error] [client ::1] PHP 致命错误：在 /Library/WebServer/Documents/wordpress/wp-content 中的非对象上调用成员函数 xpath() /themes/directorypress/homepage-structure.php 第 25 行

因此，您应该在访问对象上的函数之前进行检查。

if ($xml) {
      $current = $xml->xpath("/xml_api_reply/weather/current_conditions");
      $iconData = str_replace("/ig/images/weather/", "weather/",  $current[0]->icon['data']);
      $iconData = str_replace(".gif", ".png", $iconData);
}

然后您的页面将完全加载，即使从 web 服务加载 XML 失败。

于 2012-08-23T08:17:42.773 回答