PHP LIBXML

本文介绍了PHP LIBXML_NOWARNING不禁止显示警告吗?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

在使用PHPDOMDocument-> loadHTML加载html时，使用LIBXML_NOWARNING选项标志不会停止使用.其他常数确实起作用.

在下面的示例中，我添加了LIBXML_HTML_NODEFDTD来证明已接收到常量(阻止添加doctype).

$doc=new DOMDocument(); $doc->loadHTML("<tagthatdoesnotexist><h1>Hi</h1></tagthatdoesnotexist>",LIBXML_NOERROR | LIBXML_NOWARNING | LIBXML_HTML_NODEFDTD); echo $doc->saveHTML();

但是，仍然会生成警告并输出警告.我想念什么?

解决方案

< DOMDocument::loadHTML() 忽略了c0>选项，这是PHP中的一个缺陷(并且固定的).它最近在相关问题"libxml htmlParseDocument忽略htmlParseOption标志" 中提出，并提起作为 PHP错误#74004 LIBXML_NOWARNING标志在loadHTML * 上被忽略.但是，您可以自行处理错误，直到缺陷消除为止

在调用 libxml_use_internal_errors(true) . loadHTML"rel =" nofollow noreferrer> DOMDocument::loadHTML .这将防止错误冒泡到您的默认错误处理程序.然后，您可以使用其他libxml错误函数(例如， libxml_get_errors() )来获取它们(如果需要).

使用此功能时，请确保清除内部错误缓冲区.如果您不这样做，并且正在长期运行中使用它，则可能会发现您的所有内存都用光了.

如果要恢复默认功能集libxml_use_internal_errors().

代码示例:

$doc = new DOMDocument(); # clear errors list if any libxml_clear_errors(); # use internal errors, don't spill out warnings $previous = libxml_use_internal_errors(true); $doc->loadHTML("<tagthatdoesnotexist><h1>Hi</h1></tagthatdoesnotexist>"); echo $doc->saveHTML(); # clear errors list if any libxml_clear_errors(); # restore previous behavior libxml_use_internal_errors($previous);

更新

此错误已得到解决.

Using the LIBXML_NOWARNING options flag doesn't stop wanrings when loading html with PHPDOMDocument->loadHTML. Other constants do work though.

In the example below I add the LIBXML_HTML_NODEFDTD to prove that the constants are received(stops a doctype from being added).

$doc=new DOMDocument(); $doc->loadHTML("<tagthatdoesnotexist><h1>Hi</h1></tagthatdoesnotexist>",LIBXML_NOERROR | LIBXML_NOWARNING | LIBXML_HTML_NODEFDTD); echo $doc->saveHTML();

However, warnings are still generated and output. What am I missing?

解决方案

That the LIBXML_NOWARNING option is ignored with DOMDocument::loadHTML() is a flaw in PHP (and to be fixed). It has been recently brought up in a related question "libxml htmlParseDocument ignoring htmlParseOption flags" and filed as PHP Bug #74004 LIBXML_NOWARNING flag ingnored on loadHTML*.

You can, however, manage the error handling your own until the flaw is removed:

Set libxml_use_internal_errors(true) before calling DOMDocument::loadHTML. This will prevent errors from bubbling up to your default error handler. And you can then get at them (if you desire) using other libxml error functions (e.g. libxml_get_errors()).

When using this function, be sure to clear your internal error buffer. If you don't and you are using this in a long running process, you may find that all your memory is used up.

If you want to restore the the default functionality set libxml_use_internal_errors().

Code example:

$doc = new DOMDocument(); # clear errors list if any libxml_clear_errors(); # use internal errors, don't spill out warnings $previous = libxml_use_internal_errors(true); $doc->loadHTML("<tagthatdoesnotexist><h1>Hi</h1></tagthatdoesnotexist>"); echo $doc->saveHTML(); # clear errors list if any libxml_clear_errors(); # restore previous behavior libxml_use_internal_errors($previous);

Update

This bug is fixed now.