PHP 手册
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LXII. libxml Functions

简介

These functions/constants are available since PHP 5.1.0 and if you have compiled one of the extensions based on libxml, like DOM, SimpleXML and XSLT.

This extension requires libxml >= 2.6.0.

code - the error's code
column - the column where the error occurred. Please note that this property isn't entirely implemented in libxml and therefore 0 is often returned.
file - the filename, or empty if the XML was loaded from a string
level - the severity of the error (one of the following constants: LIBXML_ERR_WARNING, LIBXML_ERR_ERROR or LIBXML_ERR_FATAL)
line - the line where the error occurred
message - the error message

以下常量由本扩展模块定义，因此只有在本扩展模块被编译到 PHP 中，或者在运行时被动态加载后才有效。

LIBXML_COMPACT (integer): Activate small nodes allocation optimization. This may speed up your application without needing to change the code.
注: 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>)
注: 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
注: 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

目录
libxml_clear_errors -- Clear libxml error buffer
libxml_get_errors -- Retrieve array of errors
libxml_get_last_error -- Retrieve last error from libxml
libxml_set_streams_context -- Set the streams context for the next libxml document load or write
libxml_use_internal_errors -- Disable libxml errors and allow user to fetch error information as needed

后退	起点	前进
ldap_unbind	上一级	libxml_clear_errors