我正在学习OOP PHP，在我的教程中我写了一个脚本来显示所有声明的类。这是脚本：
<?php
class Person {
}
$classes = get_declared_classes();
foreach($classes as $class) {
echo $class ."<br/>";
}
?>
这是我运行脚本时得到的结果：
stdClass
Exception
ErrorException
Closure
COMPersistHelper
com_exception
com_safearray_proxy
variant
com
dotnet
DateTime
DateTimeZone
DateInterval
DatePeriod
LogicException
BadFunctionCallException
BadMethodCallException
DomainException
InvalidArgumentException
LengthException
OutOfRangeException
RuntimeException
OutOfBoundsException
OverflowException
RangeException
UnderflowException
UnexpectedValueException
RecursiveIteratorIterator
IteratorIterator
FilterIterator
RecursiveFilterIterator
CallbackFilterIterator
RecursiveCallbackFilterIterator
ParentIterator
LimitIterator
CachingIterator
RecursiveCachingIterator
NoRewindIterator
AppendIterator
InfiniteIterator
RegexIterator
RecursiveRegexIterator
EmptyIterator
RecursiveTreeIterator
ArrayObject
ArrayIterator
RecursiveArrayIterator
SplFileInfo
DirectoryIterator
FilesystemIterator
RecursiveDirectoryIterator
GlobIterator
SplFileObject
SplTempFileObject
SplDoublyLinkedList
SplQueue
SplStack
SplHeap
SplMinHeap
SplMaxHeap
SplPriorityQueue
SplFixedArray
SplObjectStorage
MultipleIterator
ReflectionException
Reflection
ReflectionFunctionAbstract
ReflectionFunction
ReflectionParameter
ReflectionMethod
ReflectionClass
ReflectionObject
ReflectionProperty
ReflectionExtension
ReflectionZendExtension
SessionHandler
__PHP_Incomplete_Class
php_user_filter
Directory
SQLite3
SQLite3Stmt
SQLite3Result
ZipArchive
LibXMLError
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
PDOException
PDO
PDOStatement
PDORow
SimpleXMLElement
SimpleXMLIterator
XMLReader
XMLWriter
mysqli_sql_exception
mysqli_driver
mysqli
mysqli_warning
mysqli_result
mysqli_stmt
SoapClient
SoapVar
SoapServer
SoapFault
SoapParam
SoapHeader
tidy
tidyNode
XSLTProcessor
Collator
NumberFormatter
Normalizer
Locale
MessageFormatter
IntlDateFormatter
ResourceBundle
Transliterator
Spoofchecker
finfo
PharException
Phar
PharData
PharFileInfo
OCI-Lob
OCI-Collection
ImagickException
ImagickDrawException
ImagickPixelIteratorException
ImagickPixelException
Imagick
ImagickDraw
ImagickPixelIterator
ImagickPixel
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h724_ah7wee3lxn34nv5
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java
JavaException
ZendJobQueue
ZendJobQueueException
ZendMonitorUIException
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li7fc8174z6ebzn4vz6qg
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zaak
Person
有一些看起来很正常的课程，还有很多奇怪的课程。这是正常的，这是什么意思？我在我的localhost上运行它（Zend Server免费版 - 在IIS 8.5上的PHP 5.4.21）。感谢任何有建设性的答案。