Detailed explanation of PHP's addition, deletion, modification and query operations on xml

This article mainly introduces PHP's implementation of adding, deleting, modifying, and checking operations on xml. It analyzes related implementation techniques of PHP's adding, deleting, modifying, and checking operations for xml format files based on specific cases. Friends in need can refer to the following

The example of this article describes the implementation of PHP's addition, deletion, modification and query operations on xml. Share it with everyone for your reference, the details are as follows:

Case:

index.php

##

<?php
header("content-type:text/html;charset=utf-8");
$xmldom = new DOMDocument();
$xmldom->load("demo2.xml");
//查询学生信息
$stus = $xmldom->getElementsByTagName("学生");
for ($i=0;$i<$stus->length;$i++){
  $stu = $stus->item($i);
  getxmlnode($stu, "姓名");
  getxmlnode($stu, "年龄");
  getxmlnode($stu, "性别");
  getxmlnode($stu, "介绍");
}
function getxmlnode(&$stu,$tagname){
  echo $stuname = $stu->getElementsByTagName($tagname)->item(0)->nodeValue."<br/>";
}
//添加一个学生信息
//addxml($xmldom);
function addxml($xmldom){
  $root = $xmldom->getElementsByTagName("班级")->item(0);
  $ostus = $xmldom->createElement_x_x("学生");
  //添加属性
  $ostus->setAttribute("恋爱状况","热恋中");
  //$ostus->nodeValue="\r\n";
  $root->a($ostus);
  $ostu_name = $xmldom->createElement_x_x("姓名");
  $ostus->a($ostu_name);
  $ostu_name->nodeValue="小娜";
  $ostu_sex = $xmldom->createElement_x_x("性别");
  $ostus->a($ostu_sex);
  $ostu_sex->nodeValue="女";
  $ostu_age = $xmldom->createElement_x_x("年龄");
  $ostus->a($ostu_age);
  $ostu_age->nodeValue="23";
  $ostu_intro = $xmldom->createElement_x_x("介绍");
  $ostus->a($ostu_intro);
  $ostu_intro->nodeValue="高一美女";
  $xmldom->save("demo2.xml");
}
//删除一个学生信息
//del_element($xmldom);
function del_element($xmldom){
  $dstus = $xmldom->getElementsByTagName("学生");
  $laststu = $dstus->item($dstus->length-1);
  $laststu->parentNode->removeChild($laststu);
}
//修改一个学生信息
//update_element($xmldom);
function update_element($xmldom){
  $ustus = $xmldom->getElementsByTagName("学生");
  $ustu = $ustus->item(0);
  $ustu_age = $ustu->getElementsByTagName("年龄")->item(0);
  $ustu_age->nodeValue+=10;
}
//写会到文件中
$xmldom->save("demo2.xml");
?>

demo2.xml

<?xml version="1.0" encoding="UTF-8"?>
<班级>
</班级

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