php多維數組根據鍵名快速查詢其父鍵以及父鍵值-php教程-PHP中文網

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/**
* FILE_NAME : arr.php FILE_PATH : test/
* 在多維數組中根據鍵名快速查詢其父鍵以及父鍵值
*
* @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") ;
$arr = array
(
'china' => array
(
'name' => '中國',
'cite' => array
(
'beijing' => array
(
'name' => '北京',
'site' => array('chaoyang' => '朝陽區', 'xuanwu' => '宣武區')
),
'shanghai' => array
(
'name' => '上海',
'site' => array('jingan' => '靜安區', 'huangpu' => '黃浦區')
)
)
)
);
function printA($data)
{
echo '
```
';
```
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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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列印出資料如下 Array ( [china] => [name] => china [cite] => china [beijing] => cite [site] => beijing [chaoyang] => site [xuanwu] => site [shanghai] => cite [jingan] => site [huangpu] => site ) 不過上面那樣寫存在一個問題，即：如果有同名鍵，會造成丟失，於是我寫了這麼一個類只需要將數組傳遞給對象，對象提供兩個接口 printArr 列印索引數組 search 查詢鍵名的父數組鍵名 IndexKey建立查詢索引查詢類別：

/**
* FILE_NAME : arr.php FILE_PATH : test/
* 在多維數組中根據鍵名快速查詢其父鍵以及父鍵值
*
* @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");
$arr = array
(
'china' => array
(
'name' => '中國',
'cite' => array
(
'beijing' => array
(
'name' => '北京',
'site' => array('chaoyang' => '朝陽區', 'xuanwuwu ' => '宣武區')
),
'shanghai' => array
(
'name' => '上海',
'site' => array('jingan ' => '靜安區', 'huangpu' => '黃浦區')
)
)
)
);
function printA($data)
{
echo '
```
';
```
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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()
{
{
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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最後只差一個資料的輸出了，於是我將這個類別修改了下提供了三個對外的方法 printArr 列印索引數組 search 查詢鍵名的父數組鍵名 parentValue 查詢父鍵值

/**
* FILE_NAME : arr.php FILE_PATH : test/
* 在多維數組中根據鍵名快速查詢其父鍵以及父鍵值
*
* @author Levi
* @package test.arr
* @subpackage
* @version 2011-04-29
* @link bbs.it-home.org
*/
header("Content-Type: text/html; charset=utf- 8");
$arr = array
(
'china' => array
(
'name' => '中國',
'cite' => array
(
'beijing' => array
(
'name' => '北京',
'site' => array('chaoyang' => '朝陽區', 'xuanwuwu ' => '宣武區')
),
'shanghai' => array
(
'name' => '上海',
'site' => array('jingan ' => '靜安區', 'huangpu' => '黃浦區')
)
)
)
);
function printA($data)
{
echo '
```
';
```
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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)$this->_arr;_arr;~~public function search($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');

?>

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