Tipos de recursos
libXMLError
libxml
PHP Manual

# Constantes predefinidas

Estas constantes están definidas por esta extensión y estarán disponibles solamente cuando la extensión ha sido o bien compilada dentro de PHP o grabada dinámicamente en tiempo de ejecución.

`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_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 namespaces declarations
`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

Tipos de recursos
libXMLError
libxml
PHP Manual