The libxml functions and constants are used together with SimpleXML, XSLT and DOM functions.
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Installation
These functions require the libxml package. It can be downloaded here: Downloads at xmlsoft.org
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PHP libxml Functions
PHP: indicates the earliest version of PHP that supports the function.
Function Description PHP
libxml_clear_errors() Clear libxml error buffer 5
libxml_get_errors() Retrieve array of errors 5
libxml_get_last_error() Retrieve last error from libxml 5
libxml_set_streams_context() Set the streams context for the next libxml document load or write 5
libxml_use_internal_errors() Disable libxml errors and allow user to fetch error information as needed 5
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PHP libxml Constants
Function Description PHP
LIBXML_COMPACT Set small nodes allocation optimization. This may improve the application performance 5
LIBXML_DTDATTR Set default DTD attributes 5
LIBXML_DTDLOAD Load external subset 5
LIBXML_DTDVALID Validate with the DTD 5
LIBXML_NOBLANKS Remove blank nodes 5
LIBXML_NOCDATA Set CDATA as text nodes 5
LIBXML_NOEMPTYTAG Change empty tags (e.g. <br/> to <br></br>), only available in the DOMDocument->save() and DOMDocument->saveXML() functions 5
LIBXML_NOENT Substitute entities 5
LIBXML_NOERROR Do not show error reports 5
LIBXML_NONET Stop network access while loading documents 5
LIBXML_NOWARNING Do not show warning reports 5
LIBXML_NOXMLDECL Drop the XML declaration when saving a document 5
LIBXML_NSCLEAN Remove excess namespace declarations 5
LIBXML_XINCLUDE Use XInclude substitution 5
LIBXML_ERR_ERROR Get recoverable errors 5
LIBXML_ERR_FATAL Get fatal errors 5
LIBXML_ERR_NONE Get no errors 5
LIBXML_ERR_WARNING Get simple warnings 5
LIBXML_VERSION Get libxml version (e.g. 20605 or 20617) 5
LIBXML_DOTTED_VERSION Get dotted libxml version (e.g. 2.6.5 or 2.6.17) 5
source:http://www.w3schools.com/php/php_ref_libxml.asp
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