php多维数组根据键名快速查询其父键以及父键值 -tutorial php-php.cn

/**
* FILE_NAME : arr.php FILE_PATH : test/
* 在多维数组中根据键名快速查询其父键以及父键值
*
* @copyright Copyright (c) 2006-2010
* @author Levi
* @package test.arr
* @subpackage
* @version 2011-04-29
* @link bbs.it-home.org
*/
header("Content-Type: text/html; charset=utf-8");
$arr = array
(
'china' => array
(
'name' => '中国',
'cite' => array
(
'beijing' => array
(
'name' => '北京',
'site' => array('chaoyang' => '朝阳区', 'xuanwu' => '宣武区')
),
'shanghai' => array
(
'name' => '上海',
'site' => array('jingan' => '静安区', 'huangpu' => '黄浦区')
)
)
)
);
function printA($data)
{
echo '
```
';
```
Salin selepas log masuk
Salin selepas log masuk
Salin selepas log masuk
print_r($data);
echo '';
}
function indexKey($data, $parent = NULL)
{
$arr = array();
foreach ($data as $key => $value)
{
$arr[$key] = $parent;
if (is_array($value))
{
$arr += indexKey($value, $key);
}
}
return (Array)$arr;
}
printA(indexKey($arr));
?>

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打印出数据如下 Array ( [china] => [name] => china [cite] => china [beijing] => cite [site] => beijing [chaoyang] => site [xuanwu] => site [shanghai] => cite [jingan] => site [huangpu] => site ) 不过上面那样写存在一个问题，即：如果有同名键，会造成丢失，于是我写了这么一个类只需要将数组传递给对象，对象提供两个接口 printArr 打印索引数组 search 查询键名的父数组键名 IndexKey创建查询索引查询类：

/**
* FILE_NAME : arr.php FILE_PATH : test/
* 在多维数组中根据键名快速查询其父键以及父键值
*
* @copyright Copyright (c) 2006-2010
* @author Levi
* @package test.arr
* @subpackage
* @version 2011-04-29
* @link bbs.it-home.org
*/
header("Content-Type: text/html; charset=utf-8");
$arr = array
(
'china' => array
(
'name' => '中国',
'cite' => array
(
'beijing' => array
(
'name' => '北京',
'site' => array('chaoyang' => '朝阳区', 'xuanwu' => '宣武区')
),
'shanghai' => array
(
'name' => '上海',
'site' => array('jingan' => '静安区', 'huangpu' => '黄浦区')
)
)
)
);
function printA($data)
{
echo '
```
';
```
Salin selepas log masuk
Salin selepas log masuk
Salin selepas log masuk
print_r($data);
echo '';
}
function printP(IndexKey $obj, $key)
{
$parent = $obj->search($key);
if ($parent)
{
echo '"'.$key.'" Parent Key is: ';
if (!is_array($parent))
{
echo $parent."
\n";
}
else printA($parent);
}
else echo 'NO Parent OR No Search of "'.$key.'"!'."

\n";
}
class IndexKey
{
private $_arr = array();
public function __construct($data)
{
$this->_createIndex($data);
}
public function printArr()
{
return (Array)$this->_arr;
}
public function search($key)
{
return isset($this->_arr[$key]) ? $this->_arr[$key] : NULL;
}
private function _createIndex($data, $parent = NULL)
{
foreach ($data as $key => $value)
{
$this->_checkIndex($key, $parent);
if (is_array($value))
{
$this->_createIndex($value, $key);
}
}
}
private function _checkIndex($key, $parent)
{
$index = isset($this->_arr[$key]) ? $this->_arr[$key] : NULL;
if ($index)
{
if (is_array($index))
{
array_push($this->_arr[$key], $parent);
}
else $this->_arr[$key] = array($index, $parent);
}
else $this->_arr[$key] = $parent;
}
}
$index = (Object)new IndexKey($arr);
printA($index->printArr());
printP($index, 'beijing');
printP($index, 'name');
printP($index, 'china');
?>

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最后只差一个数据的输出了，于是我将这个类修改了下提供了三个对外的方法 printArr 打印索引数组 search 查询键名的父数组键名 parentValue 查询父键值

/**
* FILE_NAME : arr.php FILE_PATH : test/
* 在多维数组中根据键名快速查询其父键以及父键值
*
* @author Levi
* @package test.arr
* @subpackage
* @version 2011-04-29
* @link bbs.it-home.org
*/
header("Content-Type: text/html; charset=utf-8");
$arr = array
(
'china' => array
(
'name' => '中国',
'cite' => array
(
'beijing' => array
(
'name' => '北京',
'site' => array('chaoyang' => '朝阳区', 'xuanwu' => '宣武区')
),
'shanghai' => array
(
'name' => '上海',
'site' => array('jingan' => '静安区', 'huangpu' => '黄浦区')
)
)
)
);
function printA($data)
{
echo '
```
';
```
Salin selepas log masuk
Salin selepas log masuk
Salin selepas log masuk
print_r($data);
echo '';
}
function printP2(IndexArr $obj, $key)
{
$parent = $obj->search($key);
if (!is_array($parent))
{
if ($parent)
{
echo '"'.$key.'" Parent Key is: '.$parent."
\n";
}
else echo 'NO Parent OR No Search of "'.$key.'"!'."
\n";;
echo '"'.$key.'" Parent "'.$parent.'" Value is: ';
printA($obj->parentValue($key));
}
else printA($parent);
}
class IndexArr
{
private $_arr = array();
public function __construct($data)
{
$this->_createIndex($data);
}
public function printArr()
{
return (Array)$this->_arr;
}
public function search($key)
{
return isset($this->_arr[$key]) ? $this->_arr[$key]['parent'] : NULL;
}
public function parentValue($key)
{
return isset($this->_arr[$key]) ? $this->_arr[$key]['data'] : NULL;
}
private function _createIndex($data, $parent = NULL)
{
foreach ($data as $key => $value)
{
$this->_checkIndex($key, $parent, $data);
if (is_array($value))
{
$this->_createIndex($value, $key);
}
}
}
private function _checkIndex($key, $parent, $data)
{
$data = $parent & isset($data[$parent]) ? $data[$parent] : $data;
!isset($this->_arr[$key]) & $this->_arr[$key] = array('data' => $data, 'parent' => '');
$index = &$this->_arr[$key]['parent'];
if (!empty($index))
{
if (is_array($index))
{
array_push($index, $parent);
}
else $index = array($index, $parent);
}
else $index = $parent;
}
}
$index2 = (Object)new IndexArr($arr);
printA($index2->printArr());
printP2($index2, 'beijing');
printP2($index2, 'name');
printP2($index2, 'china');
?>