Detecting touch devices for responsive design

Hi

I have recently looked for plugins(is iphone, mobile detector, etc.) that detect touch devices (iphone, ipad, android handsets); these plugins share the following code:

function Is_Iphone()
  {
        $ua = $_SERVER['HTTP_USER_AGENT'];
        if (strpos($ua, 'iPhone') !== FALSE){
                $this->EE =& get_instance(); 
            }
        
        $this->return_data .= $this->EE->TMPL->tagdata;
  }

I would like to extend one of these plugin to cover more devices, but I don’t like that i would end with templates that look like this

{exp:is_touch:iphone}
code…
{/exp:is_touch:iphone}
{exp:is_touch:ipad}
code…
{/exp:is_touch:ipad}

I would prefer something like this:

{exp:is_touch}
{if iphone}
code…
{/if}
{if tablet}
code…
{/if}
{/exp:is_touch}

I have read through the documentation but I have some difficulties putting things together, it’s my understanding the way conditional variables should be coded is:

function devices()
    {
        
        if (trim($tagdata) !== '') {
            
            $variables = array(
                'is_iphone' => 'FALSE',
                'is_ipod' => 'FALSE',
                'is_android => 'FALSE'
            );
            
                $this->return_data = $this->EE->TMPL->parse_variables($this->EE->TMPL->tagdata, array($variables));
        }
        
    }

but I have come to the conclusion I haven’t really understood the syntax because all my tests fail 😊 Adding $variables[‘is_iphone’] = 1; to the is_iphone function then trying to evaluate {if is_iphone}code…{/if} didn’t worked.

I am sure I am not understanding the correct process, but I can’t find examples of similar plugins that use conditionals to improve my knowledge. Any ideas/suggestions/references ?

Thanks in advance

EDIT: what i would like to accomplish is removing content if not needed (on a mobile version of a website I could remove an author image or a post excepert and showing titles only), serving smaller images to mobile devices or alternative navigational systems, and in general all the sort of problems media queries can’t solve.