XML DOM in PHP (11)

7. Create a Node

In DOM operations, adding and deleting operations must find the parent node

1, DomElement domdocument::createelement (String $name [, String $value])

Creates a node and returns a Node object

String $name: Name of the node (element name)

[, String $value]: The value of the node

2. Domnode domnode::appendchild (Domnode $newnode)

Append child nodes

Domnode $newnode: Child nodes

3, int domdocument::save (string $filename)

Saves data in the DOM to the specified file

4. DocumentElement property, representing the root node in the DOM model

 PHP Header ('content-type:text/html;charset=gb2312' ); $dom=NewDOMDocument ('1.0','Utf-8' ); $dom->load ('Demo01.xml' );//Creating a node simply means creating the node object in memory, but this object and our previous//DOM model doesn't have any connection .$person = $dom->createelement (' Person' ); $name= $dom->createelement ('name','Huangliu' ); $age= $dom->createelement (' Age',' -' );//Append name and age as child nodes to the person node$personappendchild ($name); $person-appendchild ($age);//$dom->getelementsbytagname (' persons ')->item (0)->appendchild ($newnode)//Append person to child node to root node$dom->documentelement->appendchild ($person);//Resave all data in the DOM to the Demo01.xml file$dom->save ('Demo01.xml');

Results:

 
          
  
   
    
   huangliu
  
           
  
       
 
  

8. Deleting nodes

Domnode domnode::removechild (Domnode $oldnode)

Domnode $oldnode: The node object to be deleted

Example: Remove the following blue section

 
  PHP    'content-type:text/html;charset=gb2312'  );     New ' 1.0 ' ' Utf-8 '  );    $dom'demo01.xml'  ); // first find the Node object    to delete '  Person ' 1  ); // Delete    a node $dom->documentelement->removechild ($person); // re-save the file    ' Demo01.xml ' );

9. Modify the Node

Domnode Domnode::replacechild (Domnode $newnode, Domnode $oldnode)

Domnode $newnode: New node

Domnode $oldnode: Original node

 PHP Header ('content-type:text/html;charset=gb2312' ); $dom=NewDOMDocument ('1.0','Utf-8' ); $dom->load ('Demo01.xml' );//find the node to be replaced$oldNode = $dom->getelementsbytagname (' Person')->item (2 );//Create a new node$person = $dom->createelement (' Person' ); $name= $dom->createelement ('name','Songjiang' ); $age= $dom->createelement (' Age', - ); $person-appendchild ($name); $person-appendchild ($age);//replace the original node with the new node$dom->documentelement->replacechild ($person, $oldNode);//Save File$dom->save ('Demo01.xml');

10. Save

? String Domdocument::savexml

Saving data in the DOM to a string variable

? int Domdocument::save (string $filename)

Saves data in the DOM to the specified file

11, about the attributes of the deletion and modification

1. Domattr Domelement::setattribute (String $name, String $value)

Add Property

String $name: Property name

String $value: Property value

Add the id= ' s102 ' attribute to person

 
  PHP    'content-type:text/html;charset=gb2312'  );     New ' 1.0 ' ' Utf-8 '  );    $dom'demo01.xml'  ); // Add id attribute to second person // find a second person    '  Person ' 1  ); // Add id attribute    ' ID ' ' s102 '  ); // Save File    ' Demo01.xml ' );

2. Domattr Domelement::setattribute (String $name, String $value)

modifying properties

String $name: Property name

String $value: Property value

If a node does not have this attribute, the attribute is added (note the difference from the above)

If a node already exists for this property, it indicates that the property is modified

3, bool Domelement::removeattribute (string $name)

Delete attribute (not delete node)

$name: The property to be deleted

 
  PHP    'content-type:text/html;charset=gb2312'  );     New ' 1.0 ' ' Utf-8 '  );    $dom'demo01.xml'  ); // Delete the id attribute of the 2nd person // find a second person    '  Person ' 1  ); // Delete id attribute    $person->removeattribute ('ID'); // Save File    ' Demo01.xml ' );

4. Get Properties

String Domelement::getattribute (String $name)

String $name: Property name

 
  PHP    'content-type:text/html;charset=gb2312'  );     New ' 1.0 ' ' Utf-8 '  );    $dom'demo01.xml'  ); // Query the id attribute of a 1th person // find a 1th person.    '  Person ' 0  ); // Query ID Property    echo $person->getattribute ('ID');

SimpleXML

PHP DOM: Adding and deleting changes

SimpleXML: Query

First, read the XML

1. SimpleXMLElement simplexml_load_file (String $filename)

Reading data from an XML file

String $filename: XML file name

2, Simplexmlelement::__construct (string data)

Reading data from a string

String in data:xml format

If the data is saved to a file, use Simplexml_load_file to read

If the data is saved to a string, the constructor method of the SimpleXMLElement class is used to read

The above describes the XML DOM (11) in PHP, including aspects of the content, I hope that the PHP tutorial interested in a friend helpful.

