DOM (document object model) document XML file object model

Dom（Document object model） file - object - Model , The core idea is to put a Xml File as an object model , Then operate through objects Xml file . Let's first summarize DOM Object's property method , The application is illustrated by cases ！

DOMDocument attribute ：

Attributes A list of properties of the storage node ( read-only )

childNodes List of child nodes of the storage node ( read-only )

dataType Returns the data type of this node

Definition With DTD or XML The definition of the node given by the pattern ( read-only )

Doctype Specify the document type node ( read-only )

documentElement Returns the root element of the document ( read-write )

firstChild Returns the first child of the current node ( read-only )

Implementation return XMLDOMImplementation object

lastChild Returns the last child of the current node ( read-only )

nextSibling Returns the next sibling of the current node ( read-only )

nodeName Returns the name of the node ( read-only )

nodeType Return the type of node ( read-only )

nodeTypedValue Storage node values ( read-write )

nodeValue Returns the text of the node ( read-write )

ownerDocument Returns the root document containing this node ( read-only )

parentNode Return to the parent node ( read-only )

Parsed Returns whether this node and its children have been resolved ( read-only )

Prefix Returns the namespace prefix ( read-only )

preserveWhiteSpace Specifies whether to leave blank ( read-write )

previousSibling Returns the previous sibling of this node ( read-only )

Text Returns the text content of this node and its descendants ( read-write )

url Returns the most recently loaded XML Document URL( read-only )

Xml Returns the number of nodes and their descendants XML Express ( read-only )

DOMDocument Method ：

appendChild Add a new child node for the current node , After the last child node

cloneNode Returns a copy of the current node

createAttribute Create new properties

createCDATASection Create... That includes the given data CDATA paragraph

createComment Create an annotation node

createDocumentFragment establish DocumentFragment object

createElement_x Create an element node

createEntityReference establish EntityReference object

createNode Create a given type , Node of name and namespace

createPorcessingInstruction Create operation instruction node

createTextNode Create a text node that contains the given data

getElementsByTagName Returns the set of elements with the specified name

hasChildNodes Returns whether the current node has children

insertBefore Insert a child node before the specified node

Load Import... From the specified location XML file

loadXML Import the specified string XML file

removeChild Removes the specified child node from the list of child nodes

replaceChild Replaces the specified child node from the list of child nodes

Save hold XML Save the file to the specified node

selectNodes Make a specified match to the node , And return the list of matching nodes

selectSingleNode Make a specified match to the node , And return the first matching node

transformNode Use the specified style sheet to transform nodes and their descendants

1**、 Create a Xml file **

<?php // Instantiate a DomDocument object $dom = new DomDocument('1.0', 'UTF-8'); ##### $doc->preserveWhiteSpace=false;// Remove xml Space in document ; // If the file does not exist, create one if(!file_exists("xml_test.xml")){ ​ header("Content-Type:text/plain"); ​ $root= $dom->createElement("class"); ​ $dom->appendChild($root); ​ $dom->save("xml_test.xml"); } else{ ​ $dom->load("xml_test.xml"); } print$dom->saveXML(); ?>

2**、 Add elements **

<?php //addElementsxml.php $dom = new DOMDocument("1.0","UTF-8"); $dom->load("xml_test.xml"); $root_class =$dom->getElementsByTagName("class"); $i = 0; // for($i = 0;$i < 4; $i++){ ​ $root_class_node =$root_class->item($i); ​ $stu_node=$dom->createElement("student"); ​ $stu_node->setAttribute("xingbie","man"); ​ $stu_node_name=$dom->createElement("name","name".$i); ​ // Set properties ​ $stu_node_name->setAttribute("hel","23"); ​ $stu_node_age=$dom->createElement("age","21"); ​ $stu_node_introduce=$dom->createElement("introduce","1111"); ​ $stu_node->appendChild($stu_node_name); ​ $stu_node->appendChild($stu_node_age); ​ $stu_node->appendChild($stu_node_introduce); ​ $root_class_node->appendChild($stu_node); // } $dom->save("xml_test.xml"); print $dom->saveXML(); ?>

3**、 Traversing elements **

<?php //getNode.php // Steps to parse a file //1 Create an object , Represents a document $dom = new DOMDocument("1.0","UTF-8"); //2 Make loading that Xml, Parse that file $dom->load("xml_test.xml"); //3 Get your new node $stu_nodes =$dom->getElementsByTagName("student"); for ($i=0;$i<$stu_nodes->length;$i++){ ​ // Take out each student ​ $stu_node= $stu_nodes->item($i); ​ for($i=0;$i<$stu_node->childNodes->length;$i++){ ​ echo$stu_node->childNodes->item($i)->nodeValue; ​ echo "
"; ​ } } ?>

4**、 Remove elements **

<?php // Steps to parse a file //1 Create an object , Represents a document $dom = new DOMDocument("1.0","UTF-8"); //2 Make loading that Xml, Parse that file $dom->load("xml_test.xml"); //3 Get your new node $stu_nodes =$dom->getElementsByTagName("student"); $stu_node=$stu_nodes->item($stu_nodes->length -1); $stu_node->parentNode->removeChild($stu_node); $dom->save("xml_test.xml"); ?>

5**、 Modify element properties **

<?php //1 Create an object , Represents a document $dom = new DOMDocument("1.0","UTF-8"); //2 Make loading that Xml, Parse that file $dom->load("xml_test.xml"); // Find this student $stus=$dom->getElementsByTagName("age")->item(0); $stus->nodeValue=100; $dom->save("xml_test.xml"); ?>