simplexml 错误处理 php
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simplexml error handling php
提问by mrpatg
I am using the following code:
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:[email protected]/account/rate_limit_status.xml");
$left = $xml->{"remaining-hits"};
$total = $xml->{"hourly-limit"};
return $left."/".$total;
}
and getting these errors when the stream cannot connect:
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://[email protected]/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"
How can I handle these errors so I can display a user friendly message instead of what is shown above?
我该如何处理这些错误，以便显示用户友好的消息而不是上面显示的消息？
采纳答案by Briganti
I've found a nice example in the php documentation.
我在php 文档中找到了一个很好的例子。
So the code is:
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;
}
}
And the output, as we/I expected:
和输出，正如我们/我所期望的：
Failed loading XML
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
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
回答by Alex
I thinks this is a better way
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);
more info: http://php.net/manual/en/function.libxml-use-internal-errors.php
更多信息：http: //php.net/manual/en/function.libxml-use-internal-errors.php
回答by Mārti?? Briedis
If you look at the manual, there is an options parameter:
如果您查看手册，则有一个 options 参数：
SimpleXMLElement simplexml_load_file ( string $filename [, string $class_name = "SimpleXMLElement" [, int $options = 0 [, string $ns = "" [, bool $is_prefix = false ]]]] )
Options list is available: http://www.php.net/manual/en/libxml.constants.php
选项列表可用：http: //www.php.net/manual/en/libxml.constants.php
This is the correct way to suppress warnings parsing warnings:
这是抑制警告解析警告的正确方法：
$xml = simplexml_load_file('file.xml', 'SimpleXMLElement', LIBXML_NOWARNING);
回答by Halfstop
This is an old question, but is still relevant today.
这是一个古老的问题，但今天仍然相关。
The correct way to handle exceptions when using the oop SimpleXMLElment is like so.
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.
}
回答by Robert G.
My little code:
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 '- ' . $error->message;
}
}
Result example:
结果示例：
Caught exception: String could not be parsed as XML
Failed loading XML:
- Opening and ending tag mismatch: Body line 3 and Bod-y
回答by Ignas R
The documentation says that in the case of an error, simplexml_load_file returns FALSE. So, you can use the "shut-up" operator (@) in combination with a conditional statement:
文档说，在出现错误的情况下， simplexml_load_file 返回 FALSE。因此，您可以将“关闭”运算符 (@) 与条件语句结合使用：
if (@simplexml_load_file($file))
{
// continue
}
else
{
echo 'Error!';
}
回答by mere-teresa
if (simplexml_load_file($file) !== false) { // continue } else { echo 'Error!'; }
if (simplexml_load_file($file) !== false) { // 继续 } else { echo 'Error!'; }
And Twitter is down, maybe ?
而Twitter的宕机，也许？
