php从数组树中获取级别数组

要有创造力。。。

function coffee($elm, $cur_key=NULL, $level=0, &$push_arr=NULL){
   if(!is_array($push_arr)) $pusH_arr = array();
   $level++;
   foreach($elm as $key=>$val){
      if($key == 'pv'){
         $push_arr[$cur_key] = array(
             'generation' => $level,
             'pv' => $val
         );
      }
      else if(is_array($val)){
         coffee($val, $key, $level, $push_arr);
      }
      else{
         // unexpected value
      }
   }
   return $push_arr;
}
// Usage:
$normalised_array = coffee($array_from_your_question);