add_shortcode( 'app_random_service_providers', 'process_random_service_providers_shortcode');
function process_random_service_providers_shortcode ($args=array(), $content='') {

  $defaults = array(
      'select' => array(
        'value' => __('Your Service Provider:', 'appointments'),
        'help' => __('Text above the select menu. Default: "Please select a service"', 'appointments'),
        'example' => __('Please choose a service provider:', 'appointments'),
      ),
      'description' => array(
        'value' => 'excerpt',
        'help' => __('Selects which part of the bio page will be displayed under the dropdown menu when a service provider is selected . Selectable values are "none", "excerpt", "content". Default: "excerpt"', 'appointments'),
        'allowed_values' => array('none', 'excerpt', 'content',),
        'example' => 'content',
      ),
      'thumb_size' => array(
        'value' => '96,96',
        'help' => __('Inserts the post thumbnail if page has a featured image. Selectable values are "none", "thumbnail", "medium", "full" or a 2 numbers separated by comma representing width and height in pixels, e.g. 32,32. Default: "96,96"', 'appointments'),
        'example' => 'thumbnail',
      ),
      'thumb_class' => array(
        'value' => 'alignleft',
        'help' => __('css class that will be applied to the thumbnail. Default: "alignleft"', 'appointments'),
        'example' => 'my-class',
      ),
      'autorefresh' => array(
        'value' => 0,
        'help' => __('If set as 1, Show button will not be displayed and page will be automatically refreshed as client changes selection. Note: Client cannot browse through the selections and thus check descriptions on the fly (without the page is refreshed). Default: "0" (disabled)', 'appointments'),
        'example' => '1',
      ),
      'order_by' => array(
        'value' => 'ID',
        'help' => __('Sort order of the service providers. Possible values: ID, name. Optionally DESC (descending) can be used, e.g. "name DESC" will reverse the order. Default: "ID"', 'appointments'),
        'example' => 'ID',
      ),
      'service' => array(
        'value' => 0,
        'help' => __('In some cases, you may want to force to display providers who give only a certain service. In that case enter service ID here. Default: "0" (list is determined by services dropdown). Note: Multiple selections are not allowed.', 'appointments'),
        'example' => '12',
      ),
      'require_service' => array(
        'value' => 0,
        'help' => __('Do not show service provider selection at all until the service has been previously selected.', 'appointments'),
        'example' => '1',
      ),
      '_noscript' => array('value' => 0),

    );
    $ret = array();
    foreach ($defaults as $key => $item) {
      $ret[$key] = $item['value'];
    }
    $defaults = $ret;
    extract(wp_parse_args($args, $defaults));

    if (!empty($require_service) && empty($service) && empty($_REQUEST['app_service_id'])) return $content;

    global $wpdb, $appointments;
    $appointments->get_lsw();

    if ( !trim( $order_by ) )
      $order_by = 'ID';

    if ( !$service ) {
      if ( 0 == $appointments->service )
        $workers = $appointments->get_workers( $order_by );
      else
        $workers = $appointments->get_workers_by_service( $appointments->service, $order_by ); // Select only providers that can give this service
    }
    else
      $workers = $appointments->get_workers_by_service( $service, $order_by );

    $workers = apply_filters( 'app_workers', $workers );

    // If there are no workers do nothing
    if ( !$workers || empty( $workers) )
      return;

    $script ='';
    $s = $e = '';

    $s .= '<div class="app_workers" >';
    $s .= '<div class="app_workers_dropdown">';
    $s .= '<div class="app_workers_dropdown_title">';
    $s .= $select;
    $s .= '</div>';
    $s .= '<div class="app_workers_dropdown_select">';
    $s .= '<select name="app_select_workers" class="app_select_workers" disabled>';
    // Do not show "Anyone" if there is only ONE provider
    if ( 1 != count( $workers ) )
    $w_count = count( $workers );
    $rand_n = rand( 0, ( $w_count - 1 ) );
    foreach ( $workers as $key => $worker ) {
      $worker_description = '';

      if ( $appointments->worker == $worker->ID || 1 == count( $workers ) ||  ( $key == $rand_n ) ) {
        $d = '';
        $sel = ' selected="selected"';
      }
      else {
        $d = ' style="display:none"';
        $sel = '';
      }
      $s .= '<option value="'.$worker->ID.'"'.$sel.'>'. $appointments->get_worker_name( $worker->ID )  . '</option>';
      // Include excerpts
      $e .= '<div '.$d.' class="app_worker_excerpt" id="app_worker_excerpt_'.$worker->ID.'" >';
      // Let addons modify worker bio page
      $page = apply_filters( 'app_worker_page', $worker->page, $worker->ID );
      switch ( $description ) {
        case 'none'     :       break;
        case 'excerpt'  :       $worker_description .= $appointments->get_excerpt( $page, $thumb_size, $thumb_class, $worker->ID ); break;
        case 'content'  :       $worker_description .= $appointments->get_content( $page, $thumb_size, $thumb_class, $worker->ID ); break;
        default         :       $worker_description .= $appointments->get_excerpt( $page, $thumb_size, $thumb_class, $worker->ID ); break;
      }
      $e .= apply_filters('app-workers-worker_description', $worker_description, $worker, $description) . '</div>';
    }

    $s .= '</select>';
    $s .= '</div>';
    $s .= '</div>';
    $s .= '<div class="app_worker_excerpts">';
    $s .= $e;
    $s .= '</div>';

    $s .= '</div>';
    if ( isset( $_GET['wcalendar'] ) )
      $wcalendar = $_GET['wcalendar'];
    else
      $wcalendar = false;
    // First remove these parameters and add them again to make wcalendar appear before js variable
    $href = add_query_arg( array( "wcalendar"=>false, "app_provider_id" =>false ) );
    $href = apply_filters( 'app_worker_href', add_query_arg( array( "wcalendar"=>$wcalendar, "app_provider_id" => "'+selected_worker" ), $href ) );

    if ( $autorefresh ) {
      $script .= "$('.app_workers_button').hide();";
    }
    $script .= "$('.app_select_workers').change(function(){";
    $script .= "var selected_worker=$('.app_select_workers option:selected').val();";
    $script .= "if (typeof selected_worker=='undefined' || selected_worker==null){";
    $script .= "selected_worker=0;";
    $script .= "}";
    $script .= "$('.app_worker_excerpt').hide();";
    $script .= "$('#app_worker_excerpt_'+selected_worker).show();";
    if ( $autorefresh ) {
      $script .= "var redirection_url='" . $href . " + (!!parseInt(selected_worker, 10) ? '#app_worker_excerpt_'+selected_worker : '');";
      $script .= "window.location.href=redirection_url;";
    }
    $script .= "});";

    $script .= "$('.app_workers_button').click(function(){";
    $script .= "var selected_worker=$('.app_select_workers option:selected').val();";
    $script .= "var redirection_url='" . $href . " + (!!parseInt(selected_worker, 10) ? '#app_worker_excerpt_'+selected_worker : '');";
    $script .= "window.location.href=redirection_url;";
    $script .= "});";

    if (!$_noscript) $appointments->add2footer( $script );

    return $s;
  }