PHP错误/警告

Question

我在PHP &MySQL应用程序从Joomla和Jomsocial:

[05-Apr-2013 12:23:45 America/Denver] PHP Notice:  Undefined index: query in /home2
/robervl4/public_html/forum/components/com_community/community.php on line 50

此操作无法开箱运行。应用程序显示了数据库中的产品，唯一的问题是我得到了这个错误。

下面是该文件的PHP代码，第50行是:

parse_str($parts['query'], $qstring);

代码:

// DISABLE FORMAT=FEED for now 17Jan13 as requested by Fuqaha
$mainframe  = JFactory::getApplication();
$jinput     = $mainframe->input;
$viewType = $jinput->request->get('format', 'html','NONE');
if(strtolower($viewType)=='feed') {
$u = JFactory::getURI();
$parts = parse_url($u->toString());
parse_str($parts['query'], $qstring);
unset($qstring['format']);
$parts['query'] = http_build_query($qstring) ;
//recompose the URL to redirect
$scheme   = isset($parts['scheme']) ? $parts['scheme'] . '://' : ''; 
$host     = isset($parts['host']) ? $parts['host'] : ''; 
$port     = isset($parts['port']) ? ':' . $parts['port'] : ''; 
$path     = isset($parts['path']) ? $parts['path'] : ''; 
$query    = isset($parts['query']) ? '?' . $parts['query'] : ''; 
$fragment = isset($parts['fragment']) ? '#' . $parts['fragment'] : ''; 
$mainframe->redirect(CRoute::_("$scheme$host$port$path$query$fragment"));
exit('Redirecting to Non-Feed page');
}

Answer 1

parse_url仅在具有值时才包含索引。即，如果没有查询，则不设置$parts['query']。测试是否先设置:if (isset($parts['query'])) parse_str($parts['query'], $qstring);

http://php.net/manual/en/function.parse-url.php

Answer 2

parse_url可能不包含查询字段。只有当URL中存在查询部分时，它才包含查询字段;所以首先检查$parts["query"]是否存在(isset())