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<?php
function getTextBetweenTags($string, $tagname,$i)
{
    //echo $string.' - '.$tagname.'<br>';
   $matches = array();
   $pattern = "/<$tagname>(.*?)<\/$tagname>/";
   preg_match($pattern, $string, $matches);
   //print_r($matches);
   return $matches;
}

$html = '<html>
<body>
<para>1</para>
<para>2</para>
</body>
</html>';

$content = getTextBetweenTags( $html,'para', 1);
foreach( $content as $item )
{
    echo $item.'<br>';
}
?>