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function stripStyleTags($html='')
{
  $dom = new DOMDocument;                
	
  $dom->loadHTML(mb_convert_encoding($html, 'HTML-ENTITIES', 'UTF-8'));
	
  $xpath = new DOMXPath($dom); 
	
  // Find any element with the style attribute
  $nodes = $xpath->query('//*[@style]');  
	
  // Loop the elements
  foreach ($nodes as $node)               
  {             
    // Remove style attribute
    $node->removeAttribute('style');
  }
  $html = $dom->saveHTML(); 
	
  return $html;
}