无限级分类，级分类

无限级分类，级分类

public function getlist($pid = 0, &$result=array(), $spac = 0){<br />    $spac += 2;<br />    $list = M('liuyan')->where('pid='.$pid)->select();<br />    foreach($list as $val){<br />        $val['content'] = str_repeat('',$spac).$val['content'];<br />        $result[] = $val;<br />        $this->getlist($val['id'], $result, $spac);<br />    }<br />    return $result;<br />}

  function genTree($items,$id='id',$pid='pid',$son = 'children'){     $tree = array(); //格式化的树     $tmpMap = array();  //临时扁平数据           foreach ($items as $item) {         $tmpMap[$item[$id]] = $item;     }           foreach ($items as $item) {         if (isset($tmpMap[$item[$pid]])) {             $tmpMap[$item[$pid]][$son][] = &$tmpMap[$item[$id]];         } else {             $tree[] = &$tmpMap[$item[$id]];         }     }     unset($tmpMap);     return $tree; }   $items1 = array(         array('id' => 1, 'pid' => 0, 'name' => '一级11' ),         array('id' => 11, 'pid' => 0, 'name' => '一级12' ),         array('id' => 2, 'pid' => 1, 'name' => '二级21' ),         array('id' => 10, 'pid' => 11, 'name' => '二级22' ),         array('id' => 3, 'pid' => 1, 'name' => '二级23' ),         array('id' => 12, 'pid' => 11, 'name' => '二级24' ),         array('id' => 9, 'pid' => 1, 'name' => '二级25' ),         array('id' => 14, 'pid' => 1, 'name' => '二级26' ),         array('id' => 4, 'pid' => 9, 'name' => '三级31' ),         array('id' => 6, 'pid' => 9, 'name' => '三级32' ),         array('id' => 7, 'pid' => 4, 'name' => '四级41' ),         array('id' => 8, 'pid' => 4, 'name' => '四级42' ),         array('id' => 5, 'pid' => 4, 'name' => '四级43' ),         array('id' => 13, 'pid' => 4, 'name' => '四级44' ),         array('id' => 15, 'pid' => 8, 'name' => '五级51' ),         array('id' => 16, 'pid' => 8, 'name' => '五级52' ),         array('id' => 17, 'pid' => 8, 'name' => '五级53' ),         array('id' => 18, 'pid' => 16, 'name' => '六级64' ), ); var_dump(genTree($items1));