如何使用php创建blogger xml提要？

如何使用php创建blogger xml提要

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$slideshow [] = array('item' => $new[$j], 'source' => $x,'zoom' => $y); 

   $doc = new DOMDocument();
   $doc->formatOutput = true;

  $r = $doc->createElement( "slideshow" );
  $doc->appendChild( $r );

  foreach( $slideshow as $item )
  {
  $b = $doc->createElement( "item" );

  $source = $doc->createElement( "source" );
  $source->appendChild(
  $doc->createTextNode( $item['source'] )
  );
  $b->appendChild( $source );

  $zoom = $doc->createElement( "zoom" );
  $zoom->appendChild(
  $doc->createTextNode( $item['zoom'] )
  );
  $b->appendChild( $zoom );

  $r->appendChild( $b );

  }
  echo $doc->saveXML();
  $doc->save("abc.xml")

$slideshow [] = array('item' => $new[$j], 'source' => $x,'zoom' => $y); 

   $doc = new DOMDocument();
   $doc->formatOutput = true;

  $r = $doc->createElement( "slideshow" );
  $doc->appendChild( $r );

  foreach( $slideshow as $item )
  {
  $b = $doc->createElement( "item" );

  $source = $doc->createElement( "source" );
  $source->appendChild(
  $doc->createTextNode( $item['source'] )
  );
  $b->appendChild( $source );

  $zoom = $doc->createElement( "zoom" );
  $zoom->appendChild(
  $doc->createTextNode( $item['zoom'] )
  );
  $b->appendChild( $zoom );

  $r->appendChild( $b );

  }
  echo $doc->saveXML();
  $doc->save("abc.xml")