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# CLXXIII. XMLReader functions

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The XMLReader extension is an XML Pull parser. The reader acts as a cursor going forward on the document stream and stopping at each node on the way.

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The XMLReader extension is available in PECL for PHP 5.0 and is included and enabled in PHP 5.1 by default. It can be enabled by adding the argument --enable-xmlreader (or --with-xmlreader before 5.1) to your configure line. The libxml extension is required.

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## XMLReader

### Methods

- XMLReader->close() - Close the XMLReader input

- XMLReader->expand() - Export current node to a DOM node

- XMLReader->getAttribute() - Get value of attribute by name

- XMLReader->getAttributeNo() - Get value of attribute by position

- XMLReader->getAttributeNS() - Get value of attribute by name and URI

- XMLReader->getParserProperty() - Indicates if parser property is set or not

- XMLReader->isValid() - Indicates if document is valid

- XMLReader->lookupNamespace() - Get URI for prefix in scope of node

- XMLReader->moveToAttribute() - Positions reader on named attribute

- XMLReader->moveToAttributeNo() - Positions reader on attribute by index

- XMLReader->moveToAttributeNs() - Position reader on attribute by name and URI

- XMLReader->moveToElement() - Move to parent element of current attribute node

- XMLReader->moveToFirstAttribute() - Move to first attribute of node

- XMLReader->moveToNextAttribute() - Move to next attribute of node

- XMLReader->next() - Move to next element skipping children

- XMLReader->open() - Set URI to be parsed

- XMLReader->read() - Move to next node in stream

- XMLReader->setParserProperty() - Set parser property

- XMLReader->setRelaxNGSchema() - Set URI of RelaxNG schema to validate against

- XMLReader->setRelaxNGSchemaSource() - Set string containing RelaxNG schema to validate against

- XMLReader->XML() - Set string of data to be parsed

### Properties

表格 1.

Name | Type | Read-only | Description
--- | --- | --- | ---
attributeCount | int | yes | The number of attributes on the node
baseURI | string | yes | The base URI of the node
depth | int | yes | Depth of the node in the tree starting at 0
hasAttributes | bool | yes | Indicates if node has attributes
hasValue | bool | yes | Indicates if node has a text value
isDefault | bool | yes | Indicates if attribute is defaulted from DTD
isEmptyElement | bool | yes | Indicates if node is an empty element tag
localName | string | yes | The local name of the node
name | string | yes | The qualified name of the node
namespaceURI | string | yes | The URI of the namespace associated with the node
nodeType | int | yes | The node type for the node
prefix | string | yes | The prefix of the namespace associated with the node
value | string | yes | The text value of the node
xmlLang | string | yes | The xml:lang scope which the node resides

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警告
XMLReader uses class constants since PHP 5.1. Prior releases use global constants in the form `XMLREADER_ELEMENT`.

表格 2. XMLReader Node Types

Constant | Value | Description
--- | --- | ---
`XMLReader::NONE` (integer) | 0 | No node type
`XMLReader::ELEMENT` (integer) | 1 | Start element
`XMLReader::ATTRIBUTE` (integer) | 2 | Attribute node
`XMLReader::TEXT` (integer) | 3 | Text node
`XMLReader::CDATA` (integer) | 4 | CDATA node
`XMLReader::ENTITY_REF` (integer) | 5 | Entity Reference node
`XMLReader::ENTITY` (integer) | 6 | Entity Declaration node
`XMLReader::PI` (integer) | 7 | Processing Instruction node
`XMLReader::COMMENT` (integer) | 8 | Comment node
`XMLReader::DOC` (integer) | 9 | Document node
`XMLReader::DOC_TYPE` (integer) | 10 | Document Type node
`XMLReader::DOC_FRAGMENT` (integer) | 11 | Document Fragment node
`XMLReader::NOTATION` (integer) | 12 | Notation node
`XMLReader::WHITESPACE` (integer) | 13 | Whitespace node
`XMLReader::SIGNIFICANT_WHITESPACE` (integer) | 14 | Significant Whitespace node
`XMLReader::END_ELEMENT` (integer) | 15 | End Element
`XMLReader::END_ENTITY` (integer) | 16 | End Entity
`XMLReader::XML_DECLARATION` (integer) | 17 | XML Declaration node

表格 3. XMLReader Parser Options

Constant | Value | Description
--- | --- | ---
`XMLReader::LOADDTD` (integer) | 1 | Load DTD but do not validate
`XMLReader::DEFAULTATTRS` (integer) | 2 | Load DTD and default attributes but do not validate
`XMLReader::VALIDATE` (integer) | 3 | Load DTD and validate while parsing
`XMLReader::SUBST_ENTITIES` (integer) | 4 | Substitute entities and expand references

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