file_get_contents有时能读出，有时读不出

十分不稳定，怎么解决？急死了，谁能回答十分感谢

[b]问题补充：[/b]
好的，十分感谢。

可是它把错误信息也获取到了：
Warning: file_get_contents(http://bbs.phpchina.com/rss.php?fid=17&auth=Lg37Y6QgN4fqGp%2F7E2hHFGk%2BoZG2VLcc5g) [function.file-get-contents]: failed to open stream: HTTP request failed! in E:\AppServ\www\demoWeb\xmlRead2.php on line 65

Warning: file_get_contents(http://bbs.phpchina.com/rss.php?fid=17&auth=Lg37Y6QgN4fqGp%2F7E2hHFGk%2BoZG2VLcc5g) [function.file-get-contents]: failed to open stream: HTTP request failed! in E:\AppServ\www\demoWeb\xmlRead2.php on line 65
Array ( [0] => AminoAcid Object ( [title] => 鏌ヨ鍔熻兘,浠d,鍚嶇О,鏃堕棿鏌ヨ鏃跺垽鏂棶棰� [link] => http://bbs.phpchina.com/viewthread.php?tid=128263 [description] => [category] => 闂瓟姹傚姪鍖� [author] => winver [pubDate] => Mon, 15 Jun 2009 08:00:19 +0000 ) [1] => AminoAcid Object ( [title] => smarty涓繍鐢╦s鐨勯棶棰� [link] => http://bbs.phpchina.com/viewthread.php?tid=128262 [description] => [category] => 闂瓟姹傚姪鍖� [author] => dayi4ban [pubDate] => Mon, 15 Jun 2009 07:53:31 +0000 ) [2] => AminoAcid Object ( [title] => jQuery Radio 鐨勫彇鍊�,Safari 涓柟娉曪紵 [link] => http://bbs.phpchina.com/viewthread.php?tid=128258 [description] => [category] => 闂瓟姹傚姪鍖� [author] => Rainstorm [pubDate] => Mon, 15 Jun

如何只得到xml内容，而得不到得错误信息输出则滤过呢？？
得到的是string还是array，如何传值给js再处理呢？？

http://study.jokcn.com/read/s258409.html

看下方法
http://blog.zol.com.cn/781/article_780685.html

加入判断次数。假设只检查4次。

$i=0;
while(!$content or $i==4){
　　@$content =file_get_contents($url);
　　$i++;
}
if($i==4) exit("next");

@的作用：过滤错误提示