Two tree array constructors without recursion

Two tree array constructors without recursion

/**
 * 创建父节点树形数组
 * 参数
 * $ar 数组，邻接列表方式组织的数据
 * $id 数组中作为主键的下标或关联键名
 * $pid 数组中作为父键的下标或关联键名
 * 返回 多维数组
 **/
function find_parent($ar, $id='id', $pid='pid') { 
  foreach($ar as $v) $t[$v[$id]] = $v;
  foreach ($t as $k => $item){
    if( $item[$pid] ){
      if( ! isset($t[$item[$pid]]['parent'][$item[$pid]]) )
         $t[$item[$id]]['parent'][$item[$pid]] =& $t[$item[$pid]];
    }
  } 
  return $t;
}


/**
 * 创建子节点树形数组
 * 参数
 * $ar 数组，邻接列表方式组织的数据
 * $id 数组中作为主键的下标或关联键名
 * $pid 数组中作为父键的下标或关联键名
 * 返回 多维数组
 **/
function find_child($ar, $id='id', $pid='pid') {
  foreach($ar as $v) $t[$v[$id]] = $v;
  foreach ($t as $k => $item){
    if( $item[$pid] ) {
      $t[$item[$pid]]['child'][$item[$id]] =& $t[$k];
    }
  }
  return $t;
}

Example

$data = array(
  array('ID'=>1, 'PARENT'=>0, 'NAME'=>'祖父'),
  array('ID'=>2, 'PARENT'=>1, 'NAME'=>'父亲'),
  array('ID'=>3, 'PARENT'=>1, 'NAME'=>'叔伯'),
  array('ID'=>4, 'PARENT'=>2, 'NAME'=>'自己'),
  array('ID'=>5, 'PARENT'=>4, 'NAME'=>'儿子'),
);

$p = find_parent($data, 'ID', 'PARENT');
$c = find_child($data, 'ID', 'PARENT');

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