The above list is incomplete. For example, on my PHP 5.0 configuration (yours may differ depending on the extensions you choose to install), the following classes are predefined:
== "Core" ==
stdClass
Exception
__PHP_Incomplete_Class
php_user_filter
Directory
== Reflection API ==
ReflectionException
Reflection
ReflectionFunction
ReflectionParameter
ReflectionMethod
ReflectionClass
ReflectionObject
ReflectionProperty
ReflectionExtension
== SQLLite ==
SQLiteDatabase
SQLiteResult
SQLiteUnbuffered
SQLiteException
== Standard PHP Lib. ==
RecursiveIteratorIterator
FilterIterator
ParentIterator
LimitIterator
CachingIterator
CachingRecursiveIterator
ArrayObject
ArrayIterator
DirectoryIterator
RecursiveDirectoryIterator
== SimpleXML ==
SimpleXMLElement
SimpleXMLIterator
== DOM/XSL/XPath extensions ==
DOMException
DOMStringList
DOMNameList
DOMImplementationList
DOMImplementationSource
DOMImplementation
DOMNode
DOMNameSpaceNode
DOMDocumentFragment
DOMDocument
DOMNodeList
DOMNamedNodeMap
DOMCharacterData
DOMAttr
DOMElement
DOMText
DOMComment
DOMTypeinfo
DOMUserDataHandler
DOMDomError
DOMErrorHandler
DOMLocator
DOMConfiguration
DOMCdataSection
DOMDocumentType
DOMNotation
DOMEntity
DOMEntityReference
DOMProcessingInstruction
DOMStringExtend
DOMXPath
XSLTProcessor
预定义类
本节列出标准的预定义类。各种扩展库定义了其它类，其说明在各自的参考文档中。
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User Contributed Notes
Simon Kissane
14-Sep-2004 03:54
14-Sep-2004 03:54
unknown
24-Jul-2002 01:29
24-Jul-2002 01:29
It's handy to have a array of the reserved classes.....
var_dump (get_declared_classes ());