array(1) {
  ["share_friend_list"]=>;
  array(3) {
    ["your_name"]=>
    string(12) "Sarath"
    ["friends"]=>
    array(1) {
      ["friend"]=>
      array(3) {
        [0]=>
        array(2) {
          ["name"]=>
          string(6) "Ryan"
          ["msisdn"]=>
          string(9) "213412414"
        }
        [1]=>
        array(2) {
          ["name"]=>
          string(12) "Nash"
          ["msisdn"]=>
          string(9) "123423421"
        }
        [2]=>
        array(2) {
          ["name"]=>
          string(9) "Ashish"
          ["msisdn"]=>
          string(9) "123421342"
        }
      }
    }
    ["your_email"]=>
    string(19) "sarath.dr@gmail.com"

        $filePath = $this->xmlFilePath.$this->today.' - '.$type.'.xml';
        $this->doc->formatOutput = true;
 
        if( ! file_exists( $filePath ) )
        {
               $r = $this->doc->createElement( "data" );
               $this->doc->appendChild( $r );
        }
        else
        {
            @$this->doc->load( $filePath );
            $r  = $this->doc->getElementsByTagName('data')->item(0);
        }
 
        $this->extract( $info , $r  );
 
        try
        {
 
            $this->doc->saveXML();
            $this->doc->save( $filePath );
        }
        catch ( Exception $e )
        {
 
        }

 public function extract( $info , $b )
    {
 
        if( is_array( $info ) && is_array( $info[ key($info)]) )
        {
                $temp = $b;
 
                // New parent node
                if( is_integer(  key($info) )  )
                {
                     $this->extract( $info[ key($info)], $b );
                     if( count( array_slice(  $info , 1 ) ) > 0  )
                     $b = $this->parentNode->appendChild( $this->doc->createElement( $this->parentName ));
                }
               else
                {   // Inner nodes 
                    $b = $b->appendChild(  $this->doc->createElement( key($info) ) ) ;
 
                    $this->parentNode = $temp;
                    $this->parentName = key($info); 
                    $this->extract( $info[ key($info)], $b );
                    $b = $temp;
 
                }
 
        }
        else
        {
            $temp = $this->doc->createElement( key($info) );
            $temp->appendChild( $this->doc->createTextNode( $info[ key($info)] ) );
 
            $b->appendChild( $temp );
 
        }
 
        $newArray = array_slice(  $info , 1 ) ;
 
        if( is_array( $newArray ) && count( $newArray ) > 0  )
        {
               $this->extract( $newArray, $b );
        }
        else
        {
            return;
        }
 
    }

 
<?xml version="1.0"?>
<data>
  <share_friend_list>
    <your_name>Sarath</your_name>
    <friends>
      <friend>
        <name>Ryan</name>
        <msisdn>213412414</msisdn>
      </friend>
      <friend>
        <name>Nash</name>
        <msisdn>123423421</msisdn>
      </friend>
      <friend>
        <name>Ashish</name>
        <msisdn>123421342</msisdn>
      </friend>
    </friends>
    <your_email>sarath.dr@gmail.com</your_email>
  </share_friend_list>
</data>