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DOM Functions

XXVII. DOM Functions

Introduction

The DOM extension is the replacement for the DOM XML extension from PHP 4. The extension still contains many old functions, but they should no longer be used. In particular, functions that are not object-oriented should be avoided.

The extension allows you to operate on an XML document with the DOM API.

Predefined Classes

The API of the module follows the DOM Level 2 standard as closely as possible. Consequently, the API is fully object-oriented. It is a good idea to have the DOM standard available when using this module.

This module defines a number of classes, which are explained in the following tables. Classes with an equivalent in the DOM standard are named DOMxxx.

DOMAttr

Extends DOMNode.

Methods

Properties

Table 1.

Name Type Read-only Description
name string yes The name of the attribute
ownerElement DOMElement yes The element which contains the attribute
schemaTypeInfo bool yes Not implemented yet, always return TRUE
specified bool yes Not implemented yet, always return TRUE
value string no The value of the attribute

DOMCharacterData

Extends DOMNode.

Methods

Properties

Table 2.

Name Type Read-only Description
data string no The contents of the node
length int yes The length of the contents

DOMDocument

Extends DOMNode.

Constructor

Methods

Properties

Table 3.

Name Type Read-only Description
actualEncoding string yes  
config DOMConfiguration yes  
doctype DOMDocumentType yes The Document Type Declaration associated with this document.
documentElement DOMElement yes This is a convenience attribute that allows direct access to the child node that is the document element of the document.
documentURI string no The location of the document or NULL if undefined.
encoding string no  
formatOutput bool no  
implementation DOMImplementation yes The DOMImplementation object that handles this document.
preserveWhiteSpace bool no Do not remove redundant white space. Default to TRUE.
recover bool no  
resolveExternals bool no Set it to TRUE to load external entities from a doctype declaration. This is useful for including character entities in your XML document.
standalone bool no  
strictErrorChecking bool no Throws DOMException on errors. Default to TRUE.
substituteEntities bool no  
validateOnParse bool no Loads and validates against the DTD. Default to FALSE.
version string no  
xmlEncoding string yes An attribute specifying, as part of the XML declaration, the encoding of this document. This is NULL when unspecified or when it is not known, such as when the Document was created in memory.
xmlStandalone bool no An attribute specifying, as part of the XML declaration, whether this document is standalone. This is FALSE when unspecified.
xmlVersion string no An attribute specifying, as part of the XML declaration, the version number of this document. If there is no declaration and if this document supports the "XML" feature, the value is "1.0".

DOMDocumentType

Extends DOMNode

Each DOMDocument has a doctype attribute whose value is either NULL or a DOMDocumentType object.

Properties

Table 4.

Name Type Read-only Description
publicId string yes The public identifier of the external subset.
systemId string yes The system identifier of the external subset. This may be an absolute URI or not.
name string yes The name of DTD; i.e., the name immediately following the DOCTYPE keyword.
entities DOMNamedNodeMap yes A DOMNamedNodeMap containing the general entities, both external and internal, declared in the DTD.
notations DOMNamedNodeMap yes A DOMNamedNodeMap containing the notations declared in the DTD.
internalSubset string yes The internal subset as a string, or null if there is none. This is does not contain the delimiting square brackets.

DOMElement

Extends DOMNode.

Methods

Properties

Table 5.

Name Type Read-only Description
schemaTypeInfo bool yes Not implemented yet, always return TRUE
tagName string yes The element name

DOMEntity

Extends DOMNode

This interface represents a known entity, either parsed or unparsed, in an XML document.

Properties

Table 6.

Name Type Read-only Description
publicId string yes The public identifier associated with the entity if specified, and NULL otherwise.
systemId string yes The system identifier associated with the entity if specified, and NULL otherwise. This may be an absolute URI or not.
notationName string yes For unparsed entities, the name of the notation for the entity. For parsed entities, this is NULL.
actualEncoding string no An attribute specifying the encoding used for this entity at the time of parsing, when it is an external parsed entity. This is NULL if it an entity from the internal subset or if it is not known.
encoding string yes An attribute specifying, as part of the text declaration, the encoding of this entity, when it is an external parsed entity. This is NULL otherwise.
version string yes An attribute specifying, as part of the text declaration, the version number of this entity, when it is an external parsed entity. This is NULL otherwise.

DOMEntityReference

Extends DOMNode.

DOMException

DOM operations raise exceptions under perticular circumstances, i.e., when an operation is impossible to perform for logical reasons.

See also Chapter 20.

Properties

Table 7.

Name Type Read-only Description
code int yes An integer indicating the type of error generated

DOMImplementation

The DOMImplementation interface provides a number of methods for performing operations that are independent of any particular instance of the document object model.

Methods

DOMNameList

Properties

Table 8.

Name Type Read-only Description
length int yes The number of pairs (name and namespaceURI) in the list. The range of valid child node indices is 0 to length - 1 inclusive.

DOMNode

Methods

Properties

Table 9.

Name Type Read-only Description
nodeName string yes Returns the more accurate name for the current node type
nodeValue string no The value of this node, depending on its type.
nodeType int yes Gets the type of the node. One of the predefined XML_xxx_NODE constants
parentNode DOMNode yes The parent of this node.
childNodes DOMNodeList yes A DOMNodeList that contains all children of this node. If there are no children, this is an empty DOMNodeList.
firstChild DOMNode yes The first child of this node. If there is no such node, this returns NULL.
lastChild DOMNode yes The last child of this node. If there is no such node, this returns NULL.
previousSibling DOMNode yes The node immediately preceding this node. If there is no such node, this returns NULL.
nextSibling DOMNode yes The node immediately following this node. If there is no such node, this returns NULL.
attributes DOMNamedNodeMap yes A DOMNamedNodeMap containing the attributes of this node (if it is a DOMElement) or NULL otherwise.
ownerDocument DOMDocument yes The DOMDocument object associated with this node.
namespaceURI string yes The namespace URI of this node, or NULL if it is unspecified.
prefix string no The namespace prefix of this node, or NULL if it is unspecified.
localName string yes Returns the local part of the qualified name of this node.
baseURI string yes The absolute base URI of this node or NULL if the implementation wasn't able to obtain an absolute URI.
textContent string no This attribute returns the text content of this node and its descendants.

DOMNotation

Extends DOMNode

Properties

Table 10.

Name Type Read-only Description
publicId string yes  
systemId string yes  

DOMProcessingInstruction

Extends DOMNode.

Properties

Table 11.

Name Type Read-only Description
target string yes  
data string no  

DOMText

Methods

Properties

Table 12.

Name Type Read-only Description
wholeText string yes  

DOMXPath

Constructor

Methods

Properties

Table 13.

Name Type Read-only Description
document DOMDocument    

Examples

Many examples in this reference require an XML file. We will use the book.xml that contains the following:

Example 1. chapter.xml

<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
 "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" [
]>
<book id="listing">
 <title>My lists</title>
 <chapter id="books">
  <title>My books</title>
  <para>
   <informaltable>
    <tgroup cols="4">
     <thead>
      <row>
       <entry>Title</entry>
       <entry>Author</entry>
       <entry>Language</entry>
       <entry>ISBN</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>The Grapes of Wrath</entry>
       <entry>John Steinbeck</entry>
       <entry>en</entry>
       <entry>0140186409</entry>
      </row>
      <row>
       <entry>The Pearl</entry>
       <entry>John Steinbeck</entry>
       <entry>en</entry>
       <entry>014017737X</entry>
      </row>
      <row>
       <entry>Samarcande</entry>
       <entry>Amine Maalouf</entry>
       <entry>fr</entry>
       <entry>2253051209</entry>
      </row>
      <!-- TODO: I have a lot of remaining books to add.. -->
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </chapter>
</book>

Predefined Constants

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.

Table 14. XML constants

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  

Table 15. DOMException constants

Constant Value Description
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.
Table of Contents
DOMAttr->isId() --  Checks if attribute is a defined ID
DOMCharacterData->appendData() --  Append the string to the end of the character data of the node
DOMCharacterData->deleteData() --  Remove a range of characters from the node
DOMCharacterData->insertData() --  Insert a string at the specified 16-bit unit offset
DOMCharacterData->replaceData() --  Replace a substring within the DOMCharacterData node
DOMCharacterData->substringData() --  Extracts a range of data from the node
DOMDocument->__construct() --  Creates a new DOMDocument object
DOMDocument->createAttribute() -- Create new attribute
DOMDocument->createAttributeNS() --  Create new attribute node with an associated namespace
DOMDocument->createCDATASection() -- Create new cdata node
DOMDocument->createComment() -- Create new comment node
DOMDocument->createDocumentFragment() -- Create new document fragment
DOMDocument->createElement() -- Create new element node
DOMDocument->createElementNS() --  Create new element node with an associated namespace
DOMDocument->createEntityReference() -- Create new entity reference node
DOMDocument->createProcessingInstruction() -- Creates new PI node
DOMDocument->createTextNode() -- Create new text node
DOMDocument->getElementById() -- Searches for an element with a certain id
DOMDocument->getElementsByTagName() -- Searches for all elements with given tag name
DOMDocument->getElementsByTagNameNS() --  Searches for all elements with given tag name in specified namespace
DOMDocument->importNode() -- Import node into current document
DOMDocument->load() --  Load XML from a file
DOMDocument->loadHTML() --  Load HTML from a string
DOMDocument->loadHTMLFile() --  Load HTML from a file
DOMDocument->loadXML() --  Load XML from a string
DOMDocument->normalize() --  Normalizes the document
DOMDocument->relaxNGValidate() --  Performs relaxNG validation on the document
DOMDocument->relaxNGValidateSource() --  Performs relaxNG validation on the document
DOMDocument->save() --  Dumps the internal XML tree back into a file
DOMDocument->saveHTML() --  Dumps the internal document into a string using HTML formatting
DOMDocument->saveHTMLFile() --  Dumps the internal document into a file using HTML formatting
DOMDocument->saveXML() --  Dumps the internal XML tree back into a string
DOMDocument->schemaValidate() --  Validates a document based on a schema
DOMDocument->schemaValidateSource() --  Validates a document based on a schema
DOMDocument->validate() --  Validates the document based on its DTD
DOMDocument->xinclude() --  Substitutes XIncludes in a DOMDocument Object
DOMElement->getAttribute() -- Returns value of attribute
DOMElement->getAttributeNode() -- Returns attribute node
DOMElement->getAttributeNodeNS() --  Returns attribute node
DOMElement->getAttributeNS() -- Returns value of attribute
DOMElement->getElementsByTagName() -- Gets elements by tagname
DOMElement->getElementsByTagNameNS() -- Get elements by namespaceURI and localName
DOMElement->hasAttribute() -- Checks to see if attribute exists
DOMElement->hasAttributeNS() --  Checks to see if attribute exists
DOMElement->removeAttribute() -- Removes attribute
DOMElement->removeAttributeNode() -- Removes attribute
DOMElement->removeAttributeNS() -- Removes attribute
DOMElement->setAttribute() -- Adds new attribute
DOMElement->setAttributeNode() -- Adds new attribute node to element
DOMElement->setAttributeNodeNS() -- Adds new attribute node to element
DOMElement->setAttributeNS() -- Adds new attribute
DOMImplementation->createDocument() --  Creates a DOMDocument object of the specified type with its document element
DOMImplementation->createDocumentType() --  Creates an empty DOMDocumentType object
DOMImplementation->hasFeature() --  Test if the DOM implementation implements a specific feature
DOMNamedNodeMap->getNamedItem() --  Retrieves a node specified by name
DOMNamedNodeMap->getNamedItemNS() --  Retrieves a node specified by local name and namespace URI
DOMNamedNodeMap->item() -- Retrieves a node specified by index
DOMNode->appendChild() --  Adds new child at the end of the children
DOMNode->cloneNode() --  Clones a node
DOMNode->hasAttributes() --  Checks if node has attributes
DOMNode->hasChildNodes() --  Checks if node has children
DOMNode->insertBefore() --  Adds a new child before a reference node
DOMNode->isSameNode() --  Indicates if two nodes are the same node
DOMNode->isSupported() --  Checks if feature is supported for specified version
DOMNode->lookupNamespaceURI() --  Gets the namespace URI of the node based on the prefix
DOMNode->lookupPrefix() --  Gets the namespace prefix of the node based on the namespace URI
DOMNode->normalize() --  Normalizes the node
DOMNode->removeChild() --  Removes child from list of children
DOMNode->replaceChild() --  Replaces a child
DOMNodelist->item() --  Retrieves a node specified by index
DOMText->isWhitespaceInElementContent() --  Indicates whether this text node contains whitespace
DOMText->splitText() --  Breaks this node into two nodes at the specified offset
DOMXPath->__construct() --  Creates a new DOMXPath object
DOMXPath->evaluate() --  Evaluates the given XPath expression and returns a typed result if possible.
DOMXPath->query() --  Evaluates the given XPath expression
DOMXPath->registerNamespace() --  Registers the namespace with the DOMXpath object
dom_import_simplexml --  Gets a DOMElement object from a SimpleXMLElement object
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