28

我正在使用以下代码:

function GetTwitterAvatar($username){
$xml = simplexml_load_file("http://twitter.com/users/".$username.".xml");
$imgurl = $xml->profile_image_url;
return $imgurl;
}

function GetTwitterAPILimit($username, $password){
$xml = simplexml_load_file("http://$username:$password@twitter.com/account/rate_limit_status.xml");
$left = $xml->{"remaining-hits"};
$total = $xml->{"hourly-limit"};
return $left."/".$total;
}

并在流无法连接时出现这些错误:

Warning: simplexml_load_file(http://twitter.com/users/****.xml) [function.simplexml-load-file]: failed to open stream: HTTP request failed! HTTP/1.0 503 Service Unavailable

Warning: simplexml_load_file() [function.simplexml-load-file]: I/O warning : failed to load external entity "http://twitter.com/users/****.xml" 

Warning: simplexml_load_file(http://...@twitter.com/account/rate_limit_status.xml) [function.simplexml-load-file]: failed to open stream: HTTP request failed! HTTP/1.0 503 Service Unavailable

Warning: simplexml_load_file() [function.simplexml-load-file]: I/O warning : failed to load external entity "http://***:***@twitter.com/account/rate_limit_status.xml"

如何处理这些错误,以便显示用户友好的消息而不是上面显示的内容?

4

6 回答 6

48

我认为这是一个更好的方法

$use_errors = libxml_use_internal_errors(true);
$xml = simplexml_load_file($url);
if (false === $xml) {
  // throw new Exception("Cannot load xml source.\n");
}
libxml_clear_errors();
libxml_use_internal_errors($use_errors);

更多信息: http: //php.net/manual/en/function.libxml-use-internal-errors.php

于 2011-01-03T08:59:34.323 回答
26

我在php 文档中找到了一个很好的例子。

所以代码是:

libxml_use_internal_errors(true);
$sxe = simplexml_load_string("<?xml version='1.0'><broken><xml></broken>");
if (false === $sxe) {
    echo "Failed loading XML\n";
    foreach(libxml_get_errors() as $error) {
        echo "\t", $error->message;
    }
}

正如我们/我预期的那样,输出:

加载 XML 失败

Blank needed here
parsing XML declaration: '?>' expected
Opening and ending tag mismatch: xml line 1 and broken
Premature end of data in tag broken line 1
于 2011-12-14T09:01:20.403 回答
9

如果你看手册,有一个选项参数:

SimpleXMLElement simplexml_load_file ( string $filename [, string $class_name = "SimpleXMLElement" [, int $options = 0 [, string $ns = "" [, bool $is_prefix = false ]]]] )

选项列表可用:http ://www.php.net/manual/en/libxml.constants.php

这是抑制警告解析警告的正确方法:

$xml = simplexml_load_file('file.xml', 'SimpleXMLElement', LIBXML_NOWARNING);
于 2013-04-17T05:17:15.377 回答
7

这是一个古老的问题,但今天仍然适用。

使用 oop SimpleXMLElment 时处理异常的正确方法是这样的。

libxml_use_internal_errors(TRUE); // this turns off spitting errors on your screen
try {
  $xml = new SimpleXMLElement($xmlStringOfData);
} catch (Exception $e) {
  // Do something with the exception, or ignore it.
}
于 2015-11-23T15:07:01.843 回答
2

我的小代码:

try {
    libxml_use_internal_errors(TRUE);
    $xml = new SimpleXMLElement($xmlString);
    echo '<pre>'.htmlspecialchars($xml->asXML()).'</pre>';
} catch (Exception $e) {
    echo 'Caught exception: ' . $e->getMessage() . chr(10);
    echo 'Failed loading XML: ' . chr(10);
    foreach(libxml_get_errors() as $error) {
        echo '- ' . $error->message;
    }
}

结果示例:

Caught exception: String could not be parsed as XML
Failed loading XML: 
- Opening and ending tag mismatch: Body line 3 and Bod-y
于 2017-02-28T08:31:57.693 回答
-1

文档说,在发生错误的情况下,simplexml_load_file 返回 FALSE。因此,您可以将“闭嘴”运算符 (@) 与条件语句结合使用:

if (@simplexml_load_file($file))
{
    // continue
}
else 
{
    echo 'Error!';
}
于 2009-08-20T16:16:31.333 回答