PHP 无限级分类、排序

 lyk625358

  <?php  header('content-type:text/html;charset=utf-8');    echo "<pre>";  //-无限级排序,自己优化改良的,清除上次调用此函数后留下的静态变量的值    $arr = array(      array('id'=>2,'cname'=>'分类2','parent_id'=>1),      array('id'=>9,'cname'=>'分类9','parent_id'=>8),      array('id'=>1,'cname'=>'分类1','parent_id'=>0),      array('id'=>7,'cname'=>'分类7','parent_id'=>0),      array('id'=>3,'cname'=>'分类3','parent_id'=>2),      array('id'=>4,'cname'=>'分类4','parent_id'=>0),      array('id'=>6,'cname'=>'分类6','parent_id'=>5),      array('id'=>8,'cname'=>'分类8','parent_id'=>7),      array('id'=>5,'cname'=>'分类5','parent_id'=>4)  );    // 根据子类id 找所有父类  function _getParent($data, $son_id, $level=0, $isClear=true){      //声明一个静态数组存储结果      static $res = array();      //刚进入函数要清除上次调用此函数后留下的静态变量的值，进入深一层循环时则不要清除      if($isClear==true) $res =array();      foreach ($data as $v) {          if($v['id'] == $son_id){              $v['level'] = $level;              $res[] = $v;              _getParent($data, $v['parent_id'], $level-1, $isClear=false);          }      }      return $res;  }    print_r(_getParent($arr, 6));  echo "<hr color='red'>";  // 根据父类id找所有子类  function _getSon($data, $p_id=0, $level=0, $isClear=true){      //声明一个静态数组存储结果      static $res = array();      //刚进入函数要清除上次调用此函数后留下的静态变量的值，进入深一层循环时则不要清除      if($isClear==true) $res =array();      foreach ($data as $v) {          if($v['parent_id'] == $p_id){              $v['level'] = $level;              $res[] = $v;              _getSon($data, $v['id'], $level+1, $isClear=false);          }      }      return $res;  }    print_r(_getSon($arr, 0));  echo "<hr color='red'>";