<?php
 
$data = <<<DATA
<span class="address">
   <h1>Dr. Maria Steffens</h1>
   <h4>Institute of Medico</h4>
   <h4></h4>
   <h4></h4>
   <p>Sta. Ana, strt PH-501</p>
   <p>1062 Caracas</p>
   <p>France</p>
  <br>
   <p>Telefon: +58-457-2889567</p>
   <p><a href="mailto:plasticsurgery@yahoo.com">plasticsurgery@yahoo.com</a></p>
   <p><a href="http://">www.mysite.com</a></p>
</span>
DATA;
 
$dom = new DOMDocument();
$dom->loadHTML($data);
 
$xpath = new DOMXPath($dom);
$headers = $xpath->query("//h1");
foreach ($headers as $header) {
    echo $header->nodeValue;
}
?>

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