simplexml错误处理php

Question

我使用以下代码:

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;
}

并在流无法连接时收到这些错误:

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消息？

Answer 1

我认为这是一种更好的方式

$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

Answer 2

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;
    }
}

输出,正如我们/我预期的那样:

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

Answer 3

如果查看手册,则有一个选项参数:

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);

Answer 4

这是一个老问题，但今天仍然有意义。

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.
}