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.
以下的常數由此延伸定義,只在這個延伸被編譯成PHP或實行時期被動態載入時有效。
Default DTD attributes
Load the external subset
Validate with the DTD
A recoverable error
A fatal error
No errors
A simple warning
Remove blank nodes
Merge CDATA as text nodes
Substitute entities
Suppress error reports
Disable network access when loading documents
Suppress warning reports
Remove redundant namespaces declarations
Implement XInclude substitution