Read and write from xml file by php

By php it is easy to read from an xml file by php.
The following code is how to read from a xml file:

$doc = new DOMDocument();
$doc->load( 'sample.xml' ); // the file you want to read
 $i = 0;
 
// xml read code
 
  $transaction_ids = $doc->getElementsByTagName( "transaction" );
 
 
  $transactions = $doc->getElementsByTagName( "merchant" );
  $transactions_arr = array();
  foreach( $transactions as $transaction )
    {
      $ids = $transaction->getElementsByTagName( "id" );
      $id = $ids->item(0)->nodeValue;
 
      $names= $transaction->getElementsByTagName( "name" );
      $name= $names->item(0)->nodeValue;
 
      $total_amounts = $transaction->getElementsByTagName( "totalAmount" );
      $total_amount = $total_amounts->item(0)->nodeValue;
     
      $account_names = $transaction->getElementsByTagName( "accountName" );
      $account_name = $account_names->item(0)->nodeValue;
     
      $account_numbers = $transaction->getElementsByTagName( "accountNumber" );
      $account_number = $account_numbers->item(0)->nodeValue;
     
      $transaction_dates = $transaction->getElementsByTagName( "transactionDate" );
      $transaction_date = $transaction_dates->item(0)->nodeValue;
     
      $descriptions = $transaction->getElementsByTagName( "description" );
      $description = $descriptions->item(0)->nodeValue;
     
     
      $transaction_id_arr[$i] = $transaction_ids->item($i)->getAttribute('id');
     
      $transactions_arr[$i]=array('id'=>$id,'name'=>$name,'totalAmount',$total_amount,'accountName'=>$account_name,'accountNumber'=>$account_number,'transactionDate'=>$transaction_date,'description'=>$description);
      $i++;
   
  }

 // xml write code
 
  $doc = new DOMDocument();
  $doc->formatOutput = true;
 
  $c = $doc->createElement( "catalog" );
  $doc->appendChild( $c );
 
  $fname = $doc->createElement( "name" );
  $fname->appendChild( $doc->createTextNode( 'Transaction logs' ) );
  $c->appendChild( $fname );
 
  $creationDate = $doc->createElement( "creationDate" );
  $creationDate->appendChild( $doc->createTextNode( date('Y-m-d') ) );
  $c->appendChild( $fname );
 
  $copyright = $doc->createElement( "copyright" );
  $copyright->appendChild( $doc->createTextNode( 'Copyright (C) clickshopdk.com, All rights reserved.' ) );
  $c->appendChild( $copyright );
 
  $version = $doc->createElement( "version" );
  $version->appendChild( $doc->createTextNode( '1.0' ) );
  $c->appendChild( $version );
 
  $description = $doc->createElement( "description" );
  $description->appendChild( $doc->createTextNode( 'Today transactions details.' ) );
  $c->appendChild( $description );
 

  $j = 0;
 
  foreach( $transactions_arr as $transaction )
  {
      
      $t = $doc->createElement( "transaction" );
        $t->setAttribute('id', $transaction_id_arr[$j]);
        $c->appendChild( $t );
     
      $m = $doc->createElement( "merchant" );
      $t->appendChild( $m );
     
      $id = $doc->createElement( "id" );
      $id->appendChild( $doc->createTextNode( $transaction['id'] ) );
      $m->appendChild( $id );
 
      $name = $doc->createElement( "name" );
      $name->appendChild( $doc->createTextNode( $transaction['name'] ) );
      $m->appendChild( $name );
     
      $totalAmount = $doc->createElement( "totalAmount" );
      $totalAmount->appendChild( $doc->createTextNode( $transaction['totalAmount'] ) );
      $m->appendChild( $totalAmount );
     
      $accountName = $doc->createElement( "accountName" );
      $accountName->appendChild( $doc->createTextNode( $transaction['accountName'] ) );
      $m->appendChild( $accountName );
     
      $accountNumber = $doc->createElement( "accountNumber" );
      $accountNumber->appendChild( $doc->createTextNode( $transaction['accountNumber'] ) );
      $m->appendChild( $accountNumber );
     
      $transactionDate = $doc->createElement( "transactionDate" );
      $transactionDate->appendChild( $doc->createTextNode( $transaction['transactionDate'] ) );
      $m->appendChild( $transactionDate );
     
      $description = $doc->createElement( "description" );
      $description->appendChild( $doc->createTextNode( $transaction['description'] ) );
      $m->appendChild( $description );
 
     
      $j++;
     
  }


//echo $doc->saveXML();
  $doc->save("output.xml");


 you will get the same output xml like sample xml file, because you are reading from sample.xml file.

the sample.xml file is here. download sample.xml

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In WordPress website or any other site you may get like the following error when you open the site:

 [an error occurred while processing this directive]

This may be happen for your root folder directory permission

Root folder directory permission needs to be 755

If the folder permission is 777 it may cause this error.

I have solved one of my problem by changing the folder perssion from 777 to 755.