LIBXML_NOWARNING flag ignored on loadXML

[mayrs]

Description

The following code:

3v4l.org/EO4Cg

Resulted in this output:

Warning: DOMDocument::loadXML(): xml:id : attribute value 865245987 is not an NCName in Entity, line: 2 in /in/3LPpf on line 4

But I expected the warning to be suppressed instead.

Maybe this is the same issue as fixed in https://bugs.php.net/bug.php?id=74004.

PHP Version

7.4.0

Operating System

Linux Mint

[cmb69]

First, note that libxml errors are reported as PHP warnings, and libxml warnings as PHP notices:

php-src/ext/libxml/libxml.c

Lines 552 to 558 in 8731fb2

	switch (error_type) {
	case PHP_LIBXML_CTX_ERROR:
	php_libxml_ctx_error_level(E_WARNING, ctx, ZSTR_VAL(LIBXML(error_buffer).s));
	break;
	case PHP_LIBXML_CTX_WARNING:
	php_libxml_ctx_error_level(E_NOTICE, ctx, ZSTR_VAL(LIBXML(error_buffer).s));
	break;

So you would need to pass LIBXML_NOERROR instead (or in addition to) LIBXML_NOWARNING.

However, that wouldn't make a difference, since LIBXML_NOERROR and LIBXML_NOWARNING map to XML_PARSE_NOERROR and XML_PARSE_NOWARNING, respectively, but this error is not a parse error, but a validation error. To suppress all errors/warnings (including validation errors), you need to call libxml_use_internal_errors(true) prior to loading the document, and libxml_clear_errors() afterwards.

The documentation should better clarify that LIBXML_NOERRORs and LIBXML_NOWARNINGS are only about parse errors.

[github-actions]

No feedback was provided. The issue is being suspended because we assume that you are no longer experiencing the problem. If this is not the case and you are able to provide the information that was requested earlier, please do so. Thank you.