Capture Batch details for Certificate

functions.php

add_shortcode('certificate_batch_details',function($atts,$content=null){
      extract(shortcode_atts(array(
        'student_id'   => '',
        'course_id' =>'',
        'detail'=>'0' //name, administartor, 
      ), $atts));

      if(!isset($course_id) || !is_numeric($course_id)){
          $course_id=$_GET['c'];
      }
      if(!isset($student_id) || !is_numeric($student_id)){
          $student_id=$_GET['u'];
      }

if(wplms_course_has_batches($course_id)){
   global $wpdb,$bp;
		$batches = $wpdb->get_results(
					$wpdb->prepare("SELECT gm.group_id as batch_id
							FROM {$bp->groups->table_name_members} as g 
							LEFT JOIN {$bp->groups->table_name_groupmeta} as gm
							ON g.group_id = gm.group_id
							WHERE g.user_id = %d 
							AND gm.meta_key = %s 
							AND gm.meta_value = %d",
							$student_id,'batch_course',$course_id));
   if(!empty($batches)){
       $batch_id = $batches[0]->batch_id; //Capture the first batch user is enrolled into
       if($detail == 'name'){
           $group = groups_get_group($batch_id);
           return $group->name;
       }
       if($detail == 'administrator'){
           $admins = groups_get_group_admins( $batch_id );
           return bp_core_get_user_displayname($admins[0]->user_id);
       }
   }
}
return '[certificate_batch_details]';
});