get the latest node value in xml file using php code

Question

I am new wih xml file .. I want to get the latest node id value of xml file using php script and calculate it when I add one more node to this xml file .. something like this ..<id>2</id> and the next node will be <id>3</id> after adding...

suppose that i have an xml file like below:

<?xml version="1.0" encoding="UTF-8"?>
<books>
 <book>
  <id>1</id>
  <name>Java</name>
 </book>
 <book>
  <id>2</id>
  <name>c++</name>
 </book>
</books>

can you guide me which's way to solve this with php script ...thank for advance .

now i had found my solution

//auto id 
      $doc = new DOMDocument();
      libxml_use_internal_errors(true);
      $doc->loadXML(file_get_contents ('../books.xml')); // loads your xml

      $xpath = new DOMXPath($doc); ///create object xpath 
      $nlist = $xpath->query("//books/book/id");
      $count = $nlist->length; //count number of node 
      $id = $nlist->item($count-1)->nodeValue;
     $id+=1;

      echo $id ;
//end auto id

so, you can get the increment one value to $id when inserting new node.

no .. i want to get the latest node id in this xml file only suppose that .. latest id node value = 2 and when i add more node the id of the new node id is 3 — phireak
– phireak, Commented May 6, 2013 at 3:44
so you want to add more nodes in books and auto increment the id? — Dave Chen
– Dave Chen, Commented May 6, 2013 at 3:46
yes . this is what i want . how to do it . please help me thank — phireak
– phireak, Commented May 6, 2013 at 3:49

michi · Accepted Answer · 2013-05-06 21:14:30Z

0

keep it simple with simplexml:

$xml = simplexml_load_string($x); // assuming XML in $x
$maxid = max(array_map('intval',$xml->xpath("//id")));

What it does:

get an array of all <id> nodes with xpath,
transform each value to integer so that max() can do its job.

Now add a new <book> with $maxid + 1:

$book = $xml->addChild('book');
$book->addChild('id',$maxid + 1);
$book->addChild('name','PHP');

see it in action: http://codepad.viper-7.com/5jeXtJ

answered May 6, 2013 at 21:14

michi

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blahblah · Accepted Answer · 2013-05-06 04:02:49Z

0

Check this link:

http://www.phpeveryday.com/articles/PHP-XML-Adding-XML-Nodes-P414.html

It has an example almost exactly what you need - its even a book example. Just be aware that you need to autoincrement the id and not hard code it like on the example.

Its really self explanatory.

And heres a nice reference read for you:

http://pt1.php.net/manual/en/simplexmlelement.addchild.php

Hope it helped. :-)

answered May 6, 2013 at 4:02

blahblah

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1 Comment

phireak Over a year ago

it's not the right solution for me . anyway thank you for your time try answer my problem.

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