PHP: Tabs Shortcodes

/*-----------------------------------------------------------------------------------*/
/*	Tabs Shortcodes
/*-----------------------------------------------------------------------------------*/

$tabs_divs = '';

function tabs_group($atts, $content = null ) {
    global $tabs_divs;

    $tabs_divs = '';

    $output = '<div class="tabs-wrapper"><ul class="nav nav-tabs">';
    $output.= do_shortcode($content).'</ul>';
    $output.= '<div class="tab-content">'.$tabs_divs.'</div>';

    return $output;  
} 
add_shortcode('tab', 'tab');

function tab($atts, $content = null) {  
    global $tabs_divs;

    extract(shortcode_atts(array(  
        'id' => '',
        'title' => '',
        'state' => '' 
    ), $atts));  

    if(empty($id)) {
        $id = 'side-tab'.rand(100,999);
    }

    $state_link = '';
    if($state == 'open') {
    	$state = 'in active';
    	$state_link = 'active';
    }

    $output = '
        <li class="'.$state_link.'">
            <a href="#'.$id.'" data-toggle="tab">'.$title.'</a>
        </li>
    ';

    $tabs_divs.= '<div id="'.$id.'" class="tab-pane fade '.$state.'">'.$content.'</div>';

    return $output;
}
add_shortcode('tabs', 'tabs_group');