Ошибка при вызове функции

function sort_tab($name) {
  $name = 'spec = '.'"'.$name.'"';
   $specsum = $wpdb->get_results("SELECT SUM(time) as time1 FROM `information` WHERE $name");
  $specyan = $wpdb->get_results("SELECT SUM(time) as time2 FROM `information` WHERE date>='2016-01-01' and date<='2016-01-31' and $name");
  $specfeb = $wpdb->get_results("SELECT SUM(time) as time3 FROM `information` WHERE date>='2016-02-01' and date<='2016-02-29' and $name");
  $specmart = $wpdb->get_results("SELECT SUM(time) as time4 FROM `information` WHERE date>='2016-03-01' and date<='2016-03-31' and $name");
  foreach ($specsum as $value)
      {   
 
          $sum=$value->time1;
      } 
 
      foreach ($specyan as $value)
      {   
 
          $yan=$value->time2;
      }
 
      foreach ($specfeb as $value)
      {   
 
          $feb=$value->time3;
      }
 
       foreach ($specmart as $value)
      {   
         $mart=$value->time4;
      }
}

function sort_tab($name) {
global $wpdb;
//.....