无限分级(PHP版)

<?php  
 /**  
  * 把二维表分解成多级数组,做菜单时常用  
  * (可用于无线分级菜单,无限级留言)  
  * @author Lonely (从以前BLOG转过来的)
  * |----------------------|
  * |id   |parentId | value|
  * |----------------------|
  * parentId 存id的值,表示该项的父项是id为该项parentId的值的那个记录
  * 如上表:parentId为父字段,id为子字段
  */ 
 class unLimit {
     /**  
      * 设置子字段
      * @param string  
      */ 
     public static $subIdField='subId';  
     /**  
      * 设置父字段
      * @param string  
      */ 
     public static $parentIdField='parentId';
     /**  
      * 设子字段值的键值  
      * @param string  
      */ 
     public static $subField='sub';
     /**  
      * 是否重新分配KEY  
      * @param boolean 
      */ 
     public static $reSortKey=false;
     /**  
      * 处理分级数组并返回  
      * @param array $array  
      * @return array
      */ 
     public static function toSub($array){  
         if(is_array($array)){
             $proarr=array();
             foreach($array as $row){  
                 $proarr [$row [self::$parentIdField]] = $row;  
                 $proarr [$row [self::$subIdField]] [self::$subField] [$row [self::$parentIdField]] = $row;  
             }
             $proarr=self::search_sub($proarr,0);
             if(self::$reSortKey){
                 $proarr=self::re_sort_key($proarr);
             }
             return $proarr;  
         }else   
             return $array;  
     }  
     /**  
      * 关键算法函数  
      * @param array $array  
      * @param string $key 
      * @return array
      */ 
     private static function search_sub(array $array,$key){  
         $return = array ();  
         $subs = isset ( $array [$key] [self::$subField] ) ? $array [$key] [self::$subField] : array ();  
         foreach ( $subs as $k => $v ) {  
             $temp=$v;
            $temp[self::$subField]=self::search_sub ( $array, $k );
            $return [$k] = $temp;
         }  
         return $return;  
     }
     /**
      * 重新排序KEY
      * @param array $array
      * @return array
      */
     private static function re_sort_key($array){
         $array=array_values($array);
         foreach($array as $k=>$v){
             if(is_array($v[self::$subField])&&!empty($v[self::$subField])){
                 $array[$k][self::$subField]=self::re_sort_key($v[self::$subField]);
             }
         }
         return $array;
     }
 }  
 $temp=array (  
   0 =>   
   array (  
     'a' => '0',  
     'b' => '1',  
     'c' => 'a1',  
   ),  
   1 =>   
   array (  
     'a' => '0',  
     'b' => '2',  
     'c' => 'a2',  
   ),  
   2 =>   
   array (  
     'a' => '1',  
     'b' => '3',  
     'c' => 'a3',  
   ),  
   3 =>   
   array (  
     'a' => '1',  
     'b' => '4',  
     'c' => 'a4',  
   ),  
   4 =>   
   array (  
     'a' => '3',  
     'b' => '5',  
     'c' => 'a5',  
   ),  
   5 =>   
   array (  
     'a' => '3',  
     'b' => '6',  
     'c' => 'a6',  
   ),  
   6 =>   
   array (  
     'a' => '5',  
     'b' => '7',  
     'c' => 'a7',  
   ),  
   7 =>   
   array (  
     'a' => '5',  
     'b' => '8',  
     'c' => 'a8',  
   ),  
   8 =>   
   array (  
     'a' => '5',  
     'b' => '9',  
     'c' => 'a9',  
   ),  
   9 =>   
   array (  
     'a' => '6',  
     'b' => '10',  
     'c' => 'a10',  
   ),  
   10 =>   
   array (  
     'a' => '6',  
     'b' => '11',  
     'c' => 'a11',  
   ),  
   11 =>   
   array (  
     'a' => '4',  
     'b' => '12',  
     'c' => 'a12',  
   ),  
   12 =>   
   array (  
     'a' => '4',  
     'b' => '13',  
     'c' => 'a13',  
   ),  
   13 =>   
   array (  
     'a' => '12',  
     'b' => '14',  
     'c' => 'a14',  
   ),  
   14 =>   
   array (  
     'a' => '12',  
     'b' => '15',  
     'c' => 'a15',  
   ),  
   15 =>   
   array (  
     'a' => '12',  
     'b' => '16',  
     'c' => 'a16',  
   ),  
   16 =>   
   array (  
     'a' => '13',  
     'b' => '17',  
     'c' => 'a17',  
   ),  
   17 =>   
   array (  
     'a' => '13',  
     'b' => '18',  
     'c' => 'a18',  
   ),  
   18 =>   
   array (  
     'a' => '2',  
     'b' => '19',  
     'c' => 'a19',  
   ),  
   19 =>   
   array (  
     'a' => '2',  
     'b' => '20',  
     'c' => 'a20',  
   ),  
   20 =>   
   array (  
     'a' => '2',  
     'b' => '21',  
     'c' => 'a21',  
   ),  
   21 =>   
   array (  
     'a' => '19',  
     'b' => '22',  
     'c' => 'a22',  
   ),  
   22 =>   
   array (  
     'a' => '19',  
     'b' => '23',  
     'c' => 'a23',  
   ),  
   23 =>   
   array (  
     'a' => '19',  
     'b' => '24',  
     'c' => 'a24',  
   ),  
   24 =>   
   array (  
     'a' => '20',  
     'b' => '25',  
     'c' => 'a25',  
   ),  
   25 =>   
   array (  
     'a' => '20',  
     'b' => '26',  
     'c' => 'a26',  
   ),  
   26 =>   
   array (  
     'a' => '20',  
     'b' => '27',  
     'c' => 'a27',  
   ),  
   27 =>   
   array (  
     'a' => '20',  
     'b' => '28',  
     'c' => 'a28',  
   ),  
   28 =>   
   array (  
     'a' => '21',  
     'b' => '29',  
     'c' => 'a29',  
   ),  
   29 =>   
   array (  
     'a' => '21',  
     'b' => '30',  
     'c' => 'a30',  
   ),  
   30 =>   
   array (  
     'a' => '21',  
     'b' => '31',  
     'c' => 'a31',  
   ),  
   31 =>   
   array (  
     'a' => '21',  
     'b' => '32',  
     'c' => 'a32',  
   ),  
 );  
 unlimit::$subIdField="a";
 unlimit::$parentIdField='b';  
 unlimit::$reSortKey=true;  
 $subs=unlimit::toSub($temp);  
print_r($subs);