预定义常量

下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。

LIBXML_BIGLINES (integer)

Allows line numbers greater than 65535 to be reported correctly.

Note:

Only available as of PHP 7.0.0 with Libxml >= 2.9.0

LIBXML_COMPACT (integer)

Activate small nodes allocation optimization. This may speed up your application without needing to change the code.

Note:

Only available in Libxml >= 2.6.21

LIBXML_DTDATTR (integer)

Default DTD attributes

LIBXML_DTDLOAD (integer)

Load the external subset

LIBXML_DTDVALID (integer)

Validate with the DTD

LIBXML_HTML_NOIMPLIED (integer)

Sets HTML_PARSE_NOIMPLIED flag, which turns off the automatic adding of implied html/body... elements.

Note:

Only available in Libxml >= 2.7.7 (as of PHP >= 5.4.0)

LIBXML_HTML_NODEFDTD (integer)

Sets HTML_PARSE_NODEFDTD flag, which prevents a default doctype being added when one is not found.

Note:

Only available in Libxml >= 2.7.8 (as of PHP >= 5.4.0)

LIBXML_NOBLANKS (integer)

Remove blank nodes

LIBXML_NOCDATA (integer)

Merge CDATA as text nodes

LIBXML_NOEMPTYTAG (integer)

Expand empty tags (e.g. <br/> to <br></br>)

Note:

This option is currently just available in the DOMDocument::save and DOMDocument::saveXML functions.

LIBXML_NOENT (integer)

Substitute entities

LIBXML_NOERROR (integer)

Suppress error reports

LIBXML_NONET (integer)

Disable network access when loading documents

LIBXML_NOWARNING (integer)

Suppress warning reports

LIBXML_NOXMLDECL (integer)

Drop the XML declaration when saving a document

Note:

Only available in Libxml >= 2.6.21

LIBXML_NSCLEAN (integer)

Remove redundant namespace declarations

LIBXML_PARSEHUGE (integer)

Sets XML_PARSE_HUGE flag, which relaxes any hardcoded limit from the parser. This affects limits like maximum depth of a document or the entity recursion, as well as limits of the size of text nodes.

Note:

Only available in Libxml >= 2.7.0 (as of PHP >= 5.3.2 and PHP >= 5.2.12)

LIBXML_PEDANTIC (integer)

Sets XML_PARSE_PEDANTIC flag, which enables pedantic error reporting.

Note:

Available as of PHP >= 5.4.0

LIBXML_XINCLUDE (integer)

Implement XInclude substitution

LIBXML_ERR_ERROR (integer)

A recoverable error

LIBXML_ERR_FATAL (integer)

A fatal error

LIBXML_ERR_NONE (integer)

No errors

LIBXML_ERR_WARNING (integer)

A simple warning

LIBXML_VERSION (integer)

libxml version like 20605 or 20617

LIBXML_DOTTED_VERSION (string)

libxml version like 2.6.5 or 2.6.17

LIBXML_SCHEMA_CREATE (integer)

Create default/fixed value nodes during XSD schema validation

Note:

Only available in Libxml >= 2.6.14 (as of PHP >= 5.5.2)