问如何使用php实现数字序列的简短形式

EN

function group_nums($array) { 
   $ret  = array(); 
   $temp = array(); 
   foreach($array as $val) { 
      if(next($array) == ($val + 1)) 
         $temp[] = $val; 
      else 
         if(count($temp) > 0) { 
            $temp[] = $val; 
            $ret[]  = $temp[0].'-'.end($temp); 
            $temp   = array(); 
         } 
         else 
            $ret[] = $val; 
   } 
   return $ret; 
}