array_multisort

function sorting_by_sale($arrUsers, $direction="desc"){if(empty($arrUsers)){return $arrUsers;}$direArr = array("desc"=>'SORT_DESC', 'asc'=>"SORT_ASC");$sort = array(  'direction' => $direArr[$direction], //排序顺序标志 SORT_DESC 降序；SORT_ASC 升序  'field'     => 'sale_total',       //排序字段  
        );  $arrSort = array();  foreach($arrUsers AS $uniqid => $row){  foreach($row AS $key=>$value){  $arrSort[$key][$uniqid] = $value;  }  }  if($sort['direction']){  array_multisort($arrSort[$sort['field']], constant($sort['direction']), $arrUsers);  }  return $arrUsers;}