PHP LIBXML_NOWARNING not suppressing warnings?

Question

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

Answer 1

The LIBXML_NOWARNING option is ignored with DOMDocument::loadHTML() is a bug 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 bug is fixed:

1. 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()).
2. Make sure you clear the internal error buffer while using the mentioned function. If you don't and you are using this in a long running process, you may find that all your memory is used up.
3. 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("
Hi");
echo $doc->saveHTML();

# clear errors list if any
libxml_clear_errors();

# restore previous behavior
libxml_use_internal_errors($previous);

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Update

This bug is fixed now.