通过 DomDocument (PHP) 加载格式不正确的 HTML 时禁用警告
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Disable warnings when loading non-well-formed HTML by DomDocument (PHP)
提问by Viet
I need to parse some HTML files, however, they are not well-formed and PHP prints out warnings to. I want to avoid such debugging/warning behavior programatically. Please advise. Thank you!
我需要解析一些 HTML 文件，但是，它们格式不正确，PHP 会向其打印警告。我想以编程方式避免这种调试/警告行为。请指教。谢谢！
Code:
代码：
// create a DOM document and load the HTML data
$xmlDoc = new DomDocument;
// this dumps out the warnings
$xmlDoc->loadHTML($fetchResult);
This:
这个：
@$xmlDoc->loadHTML($fetchResult)
can suppress the warnings but how can I capture those warnings programatically?
可以抑制警告，但如何以编程方式捕获这些警告？
采纳答案by troelskn
You can install a temporary error handler with set_error_handler
您可以使用以下命令安装临时错误处理程序 set_error_handler
class ErrorTrap {
protected $callback;
protected $errors = array();
function __construct($callback) {
$this->callback = $callback;
}
function call() {
$result = null;
set_error_handler(array($this, 'onError'));
try {
$result = call_user_func_array($this->callback, func_get_args());
} catch (Exception $ex) {
restore_error_handler();
throw $ex;
}
restore_error_handler();
return $result;
}
function onError($errno, $errstr, $errfile, $errline) {
$this->errors[] = array($errno, $errstr, $errfile, $errline);
}
function ok() {
return count($this->errors) === 0;
}
function errors() {
return $this->errors;
}
}
Usage:
用法：
// create a DOM document and load the HTML data
$xmlDoc = new DomDocument();
$caller = new ErrorTrap(array($xmlDoc, 'loadHTML'));
// this doesn't dump out any warnings
$caller->call($fetchResult);
if (!$caller->ok()) {
var_dump($caller->errors());
}
回答by thomasrutter
Call
称呼
libxml_use_internal_errors(true);
prior to processing with with $xmlDoc->loadHTML()
在与处理之前 $xmlDoc->loadHTML()
This tells libxml2 not to senderrors and warnings through to PHP. Then, to check for errors and handle them yourself, you can consult libxml_get_last_error()and/or libxml_get_errors()when you're ready.
这告诉 libxml2不要向 PHP发送错误和警告。然后，要检查错误并自己处理它们，您可以在准备好后咨询libxml_get_last_error()和/或libxml_get_errors()。
回答by Ja?ck
To hide the warnings, you have to give special instructions to libxmlwhich is used internally to perform the parsing:
要隐藏警告，您必须给出libxml内部使用的特殊指令来执行解析：
libxml_use_internal_errors(true);
$dom->loadHTML($html);
libxml_clear_errors();
The libxml_use_internal_errors(true)indicates that you're going to handle the errors and warnings yourself and you don't want them to mess up the output of your script.
在libxml_use_internal_errors(true)表明你要处理的错误和警告自己，你不想让它们弄乱你的脚本的输出。
This is not the same as the @operator. The warnings get collected behind the scenes and afterwards you can retrieve them by using libxml_get_errors()in case you wish to perform logging or return the list of issues to the caller.
这与@运营商不一样。警告会在幕后收集，然后您可以通过使用来检索它们libxml_get_errors()，以防您希望执行日志记录或将问题列表返回给调用者。
Whether or not you're using the collected warnings you should always clear the queue by calling libxml_clear_errors().
无论您是否使用收集到的警告，您都应该始终通过调用libxml_clear_errors().
Preserving the state
保存状态
If you have other code that uses libxmlit may be worthwhile to make sure your code doesn't alter the globalstate of the error handling; for this, you can use the return value of libxml_use_internal_errors()to save the previous state.
如果您有其他代码使用libxml它，确保您的代码不会改变错误处理的全局状态可能是值得的；为此，您可以使用 的返回值libxml_use_internal_errors()来保存之前的状态。
// modify state
$libxml_previous_state = libxml_use_internal_errors(true);
// parse
$dom->loadHTML($html);
// handle errors
libxml_clear_errors();
// restore
libxml_use_internal_errors($libxml_previous_state);
回答by Joshua Ott
Setting the options "LIBXML_NOWARNING" & "LIBXML_NOERROR" works perfectly fine too:
设置选项“LIBXML_NOWARNING”和“LIBXML_NOERROR”也可以正常工作：
$dom->loadHTML($html, LIBXML_NOWARNING | LIBXML_NOERROR);
