Custom php class (search/modify) xml document

After reading the xml document for PHP operations, I learned some DOMDocument classes. next I will introduce myself to writing a class to find xml nodes and modify the node values, if you are interested, you can refer to the recently watched PHP Tutorial video, where you talked about the PHP operation xml document and learned some DOMDocument classes. I can't quite understand the manual. However, I wrote a class to find the xml node and modify the node value. The background is explained and the code is as follows:

The code is as follows:

/*

<班级>
<学生 number="101">
<名字> Sun Wukong
<名字> Sun Walker
<年龄> Monkey precision
<介绍>

<学生 number="102">
<名字> Bai Gujing
<年龄> 140
<介绍> Thousands of Magic

<学生 number="103">
<名字> Pig
<名字> Incompetent pig
<年龄> 200
<介绍> Sleep


*/
Class xmlDom {
Public $ version;
Public $ encoding;
Private $ xml;
Private $ items;
Private $ seachNode = '';
Private $ seachItem = '';
Private $ seachValue = '';
Public $ writeBytes = 0;
Function _ construct ($ xmlFile = '', $ version = '1. 0', $ encoding = 'utf-8 '){
$ This-> version = $ version;
$ This-> encoding = $ encoding;
$ This-> xml = new DOMDocument ($ version, $ encoding );
If ($ xmlFile) $ this-> xml-> load ($ xmlFile );
}
Function getRootEle ($ rootTag ){
$ This-> xmlRoot = $ this-> xml-> getElementsByTagName ($ rootTag)-> item (0 );
}
Function getSeachItem ($ itemsTag, $ seachNode, $ seachValue ){
$ This-> items = $ this-> xml-> getElementsByTagName ($ itemsTag );
$ This-> items-> length;
For ($ I = 0; $ I <$ this-> items-> length; $ I ++ ){
$ Item = $ this-> items-> item ($ I); // element
$ Node = $ item-> getElementsByTagName ($ seachNode); // node
For ($ j = 0; $ j <$ node-> length; $ j ++ ){
$ SubNode = $ node-> item ($ j );
If ($ seachValue = $ subNode-> nodeValue ){
$ This-> seachNode = $ subNode;
$ This-> seachItem = $ item;
$ This-> seachValue = $ subNode-> nodeValue;
Break (2 );
}
}
}
Return ($ this-> seachNode )? True: false;
}
Function update ($ nodeValue, $ nodeTag = '', $ append = false, $ index = 0 ){
If ($ append ){
If ($ nodeTag)
$ This-> seachItem-> getElementsByTagName ($ nodeTag)-> item ($ index)-> nodeValue + = $ nodeValue;
Else
$ This-> seachNode-> nodeValue + = $ nodeValue;
} Else {
If ($ nodeTag)
$ This-> seachItem-> getElementsByTagName ($ nodeTag)-> item ($ index)-> nodeValue = $ nodeValue;
Else
$ This-> seachNode-> nodeValue = $ nodeValue;
}
}
Function save ($ filename ){
$ This-> writeBytes = $ this-> xml-> save ($ filename );
Return ($ this-> writeBytes )? True: false;
}
}
$ Test = new xmlDom ('student. XML ');
$ Test-> getSeachItem ('studen', 'age', '000000'); // locate the pigs with age = 103
$ Test-> update ('pig pig ', 'name', false, 1); // change the second name of pig to: Pig
$ Test-> save ('new. XML'); // save it as a new file.