预定义常量

下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。

**XML constants**
Constant	Value	Description
`XML_ELEMENT_NODE` (int)	1	Node is a DOMElement
`XML_ATTRIBUTE_NODE` (int)	2	Node is a DOMAttr
`XML_TEXT_NODE` (int)	3	Node is a DOMText
`XML_CDATA_SECTION_NODE` (int)	4	Node is a DOMCharacterData
`XML_ENTITY_REF_NODE` (int)	5	Node is a DOMEntityReference
`XML_ENTITY_NODE` (int)	6	Node is a DOMEntity
`XML_PI_NODE` (int)	7	Node is a DOMProcessingInstruction
`XML_COMMENT_NODE` (int)	8	Node is a DOMComment
`XML_DOCUMENT_NODE` (int)	9	Node is a DOMDocument
`XML_DOCUMENT_TYPE_NODE` (int)	10	Node is a DOMDocumentType
`XML_DOCUMENT_FRAG_NODE` (int)	11	Node is a DOMDocumentFragment
`XML_NOTATION_NODE` (int)	12	Node is a DOMNotation
`XML_HTML_DOCUMENT_NODE` (int)	13
`XML_DTD_NODE` (int)	14
`XML_ELEMENT_DECL_NODE` (int)	15
`XML_ATTRIBUTE_DECL_NODE` (int)	16
`XML_ENTITY_DECL_NODE` (int)	17
`XML_NAMESPACE_DECL_NODE` (int)	18
`XML_ATTRIBUTE_CDATA` (int)	1
`XML_ATTRIBUTE_ID` (int)	2
`XML_ATTRIBUTE_IDREF` (int)	3
`XML_ATTRIBUTE_IDREFS` (int)	4
`XML_ATTRIBUTE_ENTITY` (int)	5
`XML_ATTRIBUTE_NMTOKEN` (int)	7
`XML_ATTRIBUTE_NMTOKENS` (int)	8
`XML_ATTRIBUTE_ENUMERATION` (int)	9
`XML_ATTRIBUTE_NOTATION` (int)	10

**DOMException constants**
Constant	Value	Description
`DOM_PHP_ERR` (int)	0	Error code not part of the DOM specification. Meant for PHP errors.
`DOM_INDEX_SIZE_ERR` (int)	1	If index or size is negative, or greater than the allowed value.
`DOMSTRING_SIZE_ERR` (int)	2	If the specified range of text does not fit into a DOMString.
`DOM_HIERARCHY_REQUEST_ERR` (int)	3	If any node is inserted somewhere it doesn't belong
`DOM_WRONG_DOCUMENT_ERR` (int)	4	If a node is used in a different document than the one that created it.
`DOM_INVALID_CHARACTER_ERR` (int)	5	If an invalid or illegal character is specified, such as in a name.
`DOM_NO_DATA_ALLOWED_ERR` (int)	6	If data is specified for a node which does not support data.
`DOM_NO_MODIFICATION_ALLOWED_ERR` (int)	7	If an attempt is made to modify an object where modifications are not allowed.
`DOM_NOT_FOUND_ERR` (int)	8	If an attempt is made to reference a node in a context where it does not exist.
`DOM_NOT_SUPPORTED_ERR` (int)	9	If the implementation does not support the requested type of object or operation.
`DOM_INUSE_ATTRIBUTE_ERR` (int)	10	If an attempt is made to add an attribute that is already in use elsewhere.
`DOM_INVALID_STATE_ERR` (int)	11	If an attempt is made to use an object that is not, or is no longer, usable.
`DOM_SYNTAX_ERR` (int)	12	If an invalid or illegal string is specified.
`DOM_INVALID_MODIFICATION_ERR` (int)	13	If an attempt is made to modify the type of the underlying object.
`DOM_NAMESPACE_ERR` (int)	14	If an attempt is made to create or change an object in a way which is incorrect with regard to namespaces.
`DOM_INVALID_ACCESS_ERR` (int)	15	If a parameter or an operation is not supported by the underlying object.
`DOM_VALIDATION_ERR` (int)	16	If a call to a method such as insertBefore or removeChild would make the Node invalid with respect to "partial validity", this exception would be raised and the operation would not be done.

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官方地址：https://www.php.net/manual/en/dom.constants.php

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预定义常量

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