在解析页面内容时删除 DocDocument 警告

Question

我正在尝试解析任何 url 的内容。不应该满足任何 html 代码。 这工作正常，但在阅读给出的 url 上的内容时会出现一堆错误。如何删除此警告？

<?php
$url= 'http://stackoverflow.com/questions/12097352/how-can-i-parse-dynamic-content-from-a-web-page';
$doc = new DOMDocument();
$doc->loadHTMLFile($url);
$xpath = new DOMXPath($doc);
foreach($xpath->query("//script") as $script) {
    $script->parentNode->removeChild($script);
}
$textContent = $doc->textContent; //inherited from DOMNode
echo $textContent;
?>

警告：

content-from-a-web-page, line: 255 in /opt/lampp/htdocs/FB/ec2/test.php on line 13

Warning: DOMDocument::loadHTMLFile(): htmlParseEntityRef: expecting ';' in http://stackoverflow.com/questions/12097352/how-can-i-parse-dynamic-content-from-a-web-page, line: 255 in /opt/lampp/htdocs/FB/ec2/test.php on line 13

Warning: DOMDocument::loadHTMLFile(): htmlParseEntityRef: expecting ';' in http://stackoverflow.com/questions/12097352/how-can-i-parse-dynamic-content-from-a-web-page, line: 273 in /opt/lampp/htdocs/FB/ec2/test.php on line 13

Warning: DOMDocument::loadHTMLFile(): htmlParseEntityRef: expecting ';' in http://stackoverflow.com/questions/12097352/how-can-i-parse-dynamic-content-from-a-web-page, line: 273 in /opt/lampp/htdocs/FB/ec2/test.php on line 13

Warning: DOMDocument::loadHTMLFile(): htmlParseEntityRef: expecting ';' in http://stackoverflow.com/questions/12097352/how-can-i-parse-dynamic-content-from-a-web-page, line: 412 in /opt/lampp/htdocs/FB/ec2/test.php on line 13

Warning: DOMDocument::loadHTMLFile(): htmlParseEntityRef: expecting ';' in http://stackoverflow.com/questions/12097352/how-can-i-parse-dynamic-content-from-a-web-page, line: 412 in /opt/lampp/htdocs/FB/ec2/test.php on line 13

Warning: DOMDocument::loadHTMLFile(): htmlParseEntityRef: expecting ';' in http://stackoverflow.com/questions/12097352/how-can-i-parse-dynamic-content-from-a-web-page, line: 551 in /opt/lampp/htdocs/FB/ec2/test.php on line 13

Warning: DOMDocument::loadHTMLFile(): htmlParseEntityRef: expecting ';' in http://stackoverflow.com/questions/12097352/how-can-i-parse-dynamic-content-from-a-web-page, line: 551 in /opt/lampp/htdocs/FB/ec2/test.php on line 13

Warning: DOMDocument::loadHTMLFile(): ID display-name already defined in http://stackoverflow.com/questions/12097352/how-can-i-parse-dynamic-content-from-a-web-page, line: 731 in /opt/lampp/htdocs/FB/ec2/test.php on line 13

Answer 1

您可以使用libxml_use_internal_errors() 并执行以下操作：

libxml_use_internal_errors(true);
$doc->loadHTMLFile($url);
libxml_clear_errors();

正如 Peehaa 在下面的 cmets 中指出的，重置错误状态是个好主意。你可以这样做：

$errors = libxml_use_internal_errors(true); //store
$doc->loadHTMLFile($url);
libxml_clear_errors();
libxml_use_internal_errors($errors); //reset back to previous state

它是这样工作的：

• libxml_use_internal_errors() 告诉 libxml 在内部处理错误和警告，并且不应将其输出到浏览器。还将错误的当前状态存储在变量中
• 然后你用loadHTML()方法加载HTML文件
• 用libxml_clear_errors清除错误缓冲区
• 恢复错误值的旧状态

Demo!