The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.
| Constant | Value | Description | 
|---|---|---|
| XML_ELEMENT_NODE(integer) | 1 | Node is a DOMElement | 
| XML_ATTRIBUTE_NODE(integer) | 2 | Node is a DOMAttr | 
| XML_TEXT_NODE(integer) | 3 | Node is a DOMText | 
| XML_CDATA_SECTION_NODE(integer) | 4 | Node is a DOMCharacterData | 
| XML_ENTITY_REF_NODE(integer) | 5 | Node is a DOMEntityReference | 
| XML_ENTITY_NODE(integer) | 6 | Node is a DOMEntity | 
| XML_PI_NODE(integer) | 7 | Node is a DOMProcessingInstruction | 
| XML_COMMENT_NODE(integer) | 8 | Node is a DOMComment | 
| XML_DOCUMENT_NODE(integer) | 9 | Node is a DOMDocument | 
| XML_DOCUMENT_TYPE_NODE(integer) | 10 | Node is a DOMDocumentType | 
| XML_DOCUMENT_FRAG_NODE(integer) | 11 | Node is a DOMDocumentFragment | 
| XML_NOTATION_NODE(integer) | 12 | Node is a DOMNotation | 
| XML_HTML_DOCUMENT_NODE(integer) | 13 | |
| XML_DTD_NODE(integer) | 14 | |
| XML_ELEMENT_DECL_NODE(integer) | 15 | |
| XML_ATTRIBUTE_DECL_NODE(integer) | 16 | |
| XML_ENTITY_DECL_NODE(integer) | 17 | |
| XML_NAMESPACE_DECL_NODE(integer) | 18 | |
| XML_ATTRIBUTE_CDATA(integer) | 1 | |
| XML_ATTRIBUTE_ID(integer) | 2 | |
| XML_ATTRIBUTE_IDREF(integer) | 3 | |
| XML_ATTRIBUTE_IDREFS(integer) | 4 | |
| XML_ATTRIBUTE_ENTITY(integer) | 5 | |
| XML_ATTRIBUTE_NMTOKEN(integer) | 7 | |
| XML_ATTRIBUTE_NMTOKENS(integer) | 8 | |
| XML_ATTRIBUTE_ENUMERATION(integer) | 9 | |
| XML_ATTRIBUTE_NOTATION(integer) | 10 | 
| Constant | Value | Description | 
|---|---|---|
| DOM_PHP_ERR(integer) | 0 | Error code not part of the DOM specification. Meant for PHP errors. | 
| DOM_INDEX_SIZE_ERR(integer) | 1 | If index or size is negative, or greater than the allowed value. | 
| DOMSTRING_SIZE_ERR(integer) | 2 | If the specified range of text does not fit into a DOMString. | 
| DOM_HIERARCHY_REQUEST_ERR(integer) | 3 | If any node is inserted somewhere it doesn't belong | 
| DOM_WRONG_DOCUMENT_ERR(integer) | 4 | If a node is used in a different document than the one that created it. | 
| DOM_INVALID_CHARACTER_ERR(integer) | 5 | If an invalid or illegal character is specified, such as in a name. | 
| DOM_NO_DATA_ALLOWED_ERR(integer) | 6 | If data is specified for a node which does not support data. | 
| DOM_NO_MODIFICATION_ALLOWED_ERR(integer) | 7 | If an attempt is made to modify an object where modifications are not allowed. | 
| DOM_NOT_FOUND_ERR(integer) | 8 | If an attempt is made to reference a node in a context where it does not exist. | 
| DOM_NOT_SUPPORTED_ERR(integer) | 9 | If the implementation does not support the requested type of object or operation. | 
| DOM_INUSE_ATTRIBUTE_ERR(integer) | 10 | If an attempt is made to add an attribute that is already in use elsewhere. | 
| DOM_INVALID_STATE_ERR(integer) | 11 | If an attempt is made to use an object that is not, or is no longer, usable. | 
| DOM_SYNTAX_ERR(integer) | 12 | If an invalid or illegal string is specified. | 
| DOM_INVALID_MODIFICATION_ERR(integer) | 13 | If an attempt is made to modify the type of the underlying object. | 
| DOM_NAMESPACE_ERR(integer) | 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(integer) | 15 | If a parameter or an operation is not supported by the underlying object. | 
| DOM_VALIDATION_ERR(integer) | 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. |