[Gargi]

Nice thing is, that this way I'm able to use multiple options devided maybe by a ";" .

[tag="opt1;opt2"]value[/tag]

PHP Code:

$tag_list['option']['XYZ'] = array(   
    'callback' => 'handle_external',  
    'external_callback' => 'handle_bbcode_XYZ_callback',   
    'strip_empty' => true   
);   
if(!function_exists('handle_bbcode_XYZ_callback'))   
{  
    function handle_bbcode_XYZ_callback(&$parsed, $value, $option)   
    {   
      
     $split = explode(";", $option);
     return $split[0]."<br />".$split[1];
     }
} 


Very handy if you need some more variables for a function.

cu
Gargi