A simple example of PHP adding data to an XML file _php instance

XML file: Stu.xml:

<?xml version= "1.0" encoding= "Utf-8"?>
<AllData>
<xueshengmen>
<xuesheng>
 <name> John </name>
 <yuwen>80</yuwen>
 <shuxue>90</shuxue>
 <yingyu>70</yingyu>
</xuesheng>
<xuesheng>
 <name> Dick </name>
 <yuwen>60</yuwen>
 <shuxue>90</shuxue>
 <yingyu>75</yingyu>
</xuesheng>
</xueshengmen>
</AllData>

The above file Stu.xml provides some student data.

Now you need to add a Zongfen attribute to each Xuesheng node and its value equals Yuwen+shuxue+yingyu value

As shown below:

<?xml version= "1.0" encoding= "Utf-8"?>
<AllData>
<xueshengmen>
<xuesheng>
 <name> John </name>
 <yuwen>80</yuwen>
 <shuxue>90</shuxue>
 <yingyu>70</yingyu>
 <zongfen>240</zongfen>
</xuesheng>
<xuesheng >
 <name> Dick </name>
 <yuwen>60</yuwen>
 <shuxue>90</shuxue>
 <yingyu>75</yingyu>
 <zongfen>2225</zongfen>
</xuesheng>
</xueshengmen>
</AllData>

Use PHP to implement:

<?php
$doc = new DOMDocument ();
$doc->load (' stu.xml ');
 $students = $doc->getelementsbytagname ("Xuesheng");
 foreach ($students as $stu) {
 $yuwen = $stu->getelementsbytagname ("Yuwen")->item (0)->nodevalue;
 $shuxue = $stu->getelementsbytagname ("Shuxue")->item (0)->nodevalue;
 $yingyu = $stu->getelementsbytagname ("Yingyu")->item (0)->nodevalue;
 $zongfen = $stu->getelementsbytagname ("Zongfen")->item (0)->nodevalue;
 if ($zongfen) {
  echo node already exists, no longer add! ";
  Continue;
 }
 $zongfen = $yuwen + $shuxue + $yingyu;
 $newNode = $doc->createelement ("Zongfen", $zongfen);
 $stu->appendchild ($newNode);
 }
 $result = $doc->savexml (' stu.xml ');
? >

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