<?
$html = '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<body>
<tag><-FIRST-> : <-SECOND-><br></tag>
</body>
</html>
';
@preg_match('/<TAG>.*<\/TAG>/i', $html, $match);
$match = str_ireplace(array('<TAG>', '</TAG>'), '', $match[0]);
$rows = array(
array(a1, a2),
array(b1, b2),
array(c1, c2),
array(d1, d2),
array(e1, e2)
);
foreach($rows as $row){
$search = array('<-FIRST->','<-SECOND->');
$replace= array($row[0], $row[1]);
$LB .= str_ireplace($search, $replace, $match);
}
echo str_ireplace('<TAG>'.$match.'</TAG>',$LB,$html);
?>