// do you want it?
<h<?=$gb_heading?> class="main_formhead">
      <?=$gb_website_name?>
</h<?=$gb_heading?>>


// or it?
<?php
class MainFormView {
   public function getMainFormHeader($size, $value) {
      return "<h$size>$value</h$size>";
   }
}
$mainFormView = new MainFormView();
$header = $mainFormView->getMainFormHeader(1, "Enter your personal information");
?>
<?=$header?>
<!-- some form -->