如果XML文件为空，则捕获PHP错误 [英] Catching PHP errors if XML file is empty

问题描述

所以我从一个XML文件中获取一些信息，如下所示：

so I'm grabbing some information from an XML file like so:

$url = "http://myurl.blah";
$xml = simplexml_load_file($url);

除了有时XML文件为空，我需要代码正常失败，但我似乎不能弄清楚如何抓住PHP错误。我试过这个：

Except sometimes the XML file is empty and I need the code to fail gracefully but I can't seem to figure out how to catch the PHP error. I tried this:

if(isset(simplexml_load_file($url)));
{
    $xml = simplexml_load_file($url);
    /*rest of code using $xml*/
}
else {
    echo "No info avilable.";
}

但它不工作。我想你不能这样使用ISSET。任何人都知道如何抓住错误？

But it doesn't work. I guess you can't use ISSET that way. Anyone know how to catch the error?

推荐答案

$xml = file_get_contents("http://myurl.blah");
if (trim($xml) == '') {
    die('No content');
}

$xml = simplexml_load_string($xml);

或者可能稍微提高效率，但不一定推荐，因为它会使错误无效：

Or, possibly slightly more efficient, but not necessarily recommended because it silences errors:

$xml = @simplexml_load_file($url);
if (!$xml) {
    die('error');
}

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