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PHP libxml Functions

PHP libxml Introduction

The libxml functions and constants are used together with SimpleXML, XSLT and DOM functions.


These functions require the libxml package. Download at

PHP libxml Functions

PHP: indicates the earliest version of PHP that supports the function.

Function Description
libxml_clear_errors() Clears the libxml error buffer
libxml_disable_entity_loader() Enables the ability to load external entities
libxml_get_errors() Gets the errors from the the libxml error buffer
libxml_get_last_error() Gets the last error from the the libxml error buffer
libxml_set_external_entity_loader() Changes the default external entity loader
libxml_set_streams_context() Sets the streams context for the next libxml document load or write
libxml_use_internal_errors() Disables the standard libxml errors and enables user error handling

PHP Predefined libxml Constants

Constant Description
LIBXML_BIGLINES Make line numbers greater than 65535 to be reported correctly
LIBXML_COMPACT Set small nodes allocation optimization. This may improve the application performance
LIBXML_DTDATTR Set default DTD attributes
LIBXML_DTDLOAD Load external subset
LIBXML_DTDVALID Validate with the DTD
LIBXML_HTML_NOIMPLIED Set HTML_PARSE_NOIMPLIED flag. This turns off automatic adding of implied html/body elements
LIBXML_HTML_NODEFDTD Set HTML_PARSE_NODEFDTD flag. This prevents a default doctype to be added, if no doctype is found
LIBXML_NOBLANKS Remove blank nodes
LIBXML_NOCDATA Set CDATA as text nodes
LIBXML_NOEMPTYTAG Change empty tags (e.g. <br/> to <br></br>), only available in the DOMDocument->save() and DOMDocument->saveXML() functions
LIBXML_NOENT Substitute entities
LIBXML_NOERROR Do not show error reports
LIBXML_NONET Stop network access while loading documents
LIBXML_NOWARNING Do not show warning reports
LIBXML_NOXMLDECL Drop the XML declaration when saving a document
LIBXML_NSCLEAN Remove excess namespace declarations
LIBXML_PARSEHUGE Set XML_PARSE_HUGE flag. This relaxes any hardcoded limit from the parser, such as maximum depth of a document or the size of text nodes
LIBXML_PEDANTIC Set XML_PARSE_PEDANTIC flag. This enables pedantic error reporting
LIBXML_XINCLUDE Use XInclude substitution
LIBXML_ERR_ERROR Get recoverable errors
LIBXML_ERR_FATAL Get fatal errors
LIBXML_ERR_NONE Get no errors
LIBXML_ERR_WARNING Get simple warnings
LIBXML_VERSION Get libxml version (e.g. 20605 or 20617)
LIBXML_DOTTED_VERSION Get dotted libxml version (e.g. 2.6.5 or 2.6.17)
LIBXML_SCHEMA_CREATE Create default or fixed value nodes during XSD schema validation