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$newstr = str_replace('<hr >', '<div class="hr"><hr ></div>', $data);

$newstr = str_replace('<hr ', '<div class="hr"><hr ></div>', $data);

>

<?php

    $plugin_info       = array(
   'pi_name'        => 'Style HR',
   'pi_version'     => '0.1',
   'pi_author'      => 'J0han',
   'pi_author_url'  => 'http://j0han.com',
   'pi_description' => 'Fancy horizontal rules',
   'pi_usage'       => Style_hr::usage()
   );

class Style_hr {
   
   function Style_hr() {

        global $TMPL;
        $data = $TMPL->tagdata;  

        $newstr = str_replace('<hr >', '<div class="hr"><hr ></div>', $data);        
        
        $this->return_data = $newstr;
   }


  // ----------------------------------------
  //  Plugin Usage
  // ----------------------------------------


   function usage()
   {
   ob_start(); 
   ?>

   {exp:style_hr}html goes here{/exp:style_hr}

   <?php
   $buffer = ob_get_contents();

   ob_end_clean(); 

   return $buffer;
   }
}

?>

$data = $TMPL->tagdata;

$data = $REGX->unhtmlentities($TMPL->tagdata);