php多维数组根据键名快速查询其父键以及父键值

2. /**
3. * FILE_NAME : arr.php FILE_PATH : test/
4. * 在多维数组中根据键名快速查询其父键以及父键值
5. *
6. * @copyright Copyright (c) 2006-2010
7. * @author Levi
8. * @package test.arr
9. * @subpackage
10. * @version 2011-04-29
11. * @link bbs.it-home.org
12. */
13. header("Content-Type: text/html; charset=utf-8");
14. $arr = array
15. (
16. 'china' => array
17. (
18. 'name' => '中国',
19. 'cite' => array
20. (
21. 'beijing' => array
22. (
23. 'name' => '北京',
24. 'site' => array('chaoyang' => '朝阳区', 'xuanwu' => '宣武区')
25. ),
26. 'shanghai' => array
27. (
28. 'name' => '上海',
29. 'site' => array('jingan' => '静安区', 'huangpu' => '黄浦区')
30. )
31. )
32. )
33. );
34. function printA($data)
35. {
36. echo '

    ';
    print_r($data);
    echo '

    ';
37. }
38. function indexKey($data, $parent = NULL)
39. {
40. $arr = array();
41. foreach ($data as $key => $value)
42. {
43. $arr[$key] = $parent;
44. if (is_array($value))
45. {
46. $arr += indexKey($value, $key);
47. }
48. }
49. return (Array)$arr;
50. }
51. printA(indexKey($arr));
52. ?>

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：

2. /**
3. * FILE_NAME : arr.php FILE_PATH : test/
4. * 在多维数组中根据键名快速查询其父键以及父键值
5. *
6. * @copyright Copyright (c) 2006-2010
7. * @author Levi
8. * @package test.arr
9. * @subpackage
10. * @version 2011-04-29
11. * @link bbs.it-home.org
12. */
13. header("Content-Type: text/html; charset=utf-8");
14. $arr = array
15. (
16. 'china' => array
17. (
18. 'name' => '中国',
19. 'cite' => array
20. (
21. 'beijing' => array
22. (
23. 'name' => '北京',
24. 'site' => array('chaoyang' => '朝阳区', 'xuanwu' => '宣武区')
25. ),
26. 'shanghai' => array
27. (
28. 'name' => '上海',
29. 'site' => array('jingan' => '静安区', 'huangpu' => '黄浦区')
30. )
31. )
32. )
33. );
34. function printA($data)
35. {
36. echo '

    ';
    print_r($data);
    echo '

    ';
37. }
38. function printP(IndexKey $obj, $key)
39. {
40. $parent = $obj->search($key);
41. if ($parent)
42. {
43. echo '"'.$key.'" Parent Key is: ';
44. if (!is_array($parent))
45. {
46. echo $parent."
    \n";
47. }
48. else printA($parent);
49. }
50. else echo 'NO Parent OR No Search of "'.$key.'"!'."
    
    \n";
51. }
52. class IndexKey
53. {
54. private $_arr = array();
55. public function __construct($data)
56. {
57. $this->_createIndex($data);
58. }
59. public function printArr()
60. {
61. return (Array)$this->_arr;
62. }
63. public function search($key)
64. {
65. return isset($this->_arr[$key]) ? $this->_arr[$key] : NULL;
66. }
67. private function _createIndex($data, $parent = NULL)
68. {
69. foreach ($data as $key => $value)
70. {
71. $this->_checkIndex($key, $parent);
72. if (is_array($value))
73. {
74. $this->_createIndex($value, $key);
75. }
76. }
77. }
78. private function _checkIndex($key, $parent)
79. {
80. $index = isset($this->_arr[$key]) ? $this->_arr[$key] : NULL;
81. if ($index)
82. {
83. if (is_array($index))
84. {
85. array_push($this->_arr[$key], $parent);
86. }
87. else $this->_arr[$key] = array($index, $parent);
88. }
89. else $this->_arr[$key] = $parent;
90. }
91. }
92. $index = (Object)new IndexKey($arr);
93. printA($index->printArr());
94. printP($index, 'beijing');
95. printP($index, 'name');
96. printP($index, 'china');
97. ?>

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

2. /**
3. * FILE_NAME : arr.php FILE_PATH : test/
4. * 在多维数组中根据键名快速查询其父键以及父键值
5. *
6. * @copyright Copyright (c) 2006-2010
7. * @author Levi
8. * @package test.arr
9. * @subpackage
10. * @version 2011-04-29
11. * @link bbs.it-home.org
12. */
13. header("Content-Type: text/html; charset=utf-8");
14. $arr = array
15. (
16. 'china' => array
17. (
18. 'name' => '中国',
19. 'cite' => array
20. (
21. 'beijing' => array
22. (
23. 'name' => '北京',
24. 'site' => array('chaoyang' => '朝阳区', 'xuanwu' => '宣武区')
25. ),
26. 'shanghai' => array
27. (
28. 'name' => '上海',
29. 'site' => array('jingan' => '静安区', 'huangpu' => '黄浦区')
30. )
31. )
32. )
33. );
34. function printA($data)
35. {
36. echo '

    ';
    print_r($data);
    echo '

    ';
37. }
38. function printP2(IndexArr $obj, $key)
39. {
40. $parent = $obj->search($key);
41. if (!is_array($parent))
42. {
43. if ($parent)
44. {
45. echo '"'.$key.'" Parent Key is: '.$parent."
    \n";
46. }
47. else echo 'NO Parent OR No Search of "'.$key.'"!'."
    \n";;
48. echo '"'.$key.'" Parent "'.$parent.'" Value is: ';
49. printA($obj->parentValue($key));
50. }
51. else printA($parent);
52. }
53. class IndexArr
54. {
55. private $_arr = array();
56. public function __construct($data)
57. {
58. $this->_createIndex($data);
59. }
60. public function printArr()
61. {
62. return (Array)$this->_arr;
63. }
64. public function search($key)
65. {
66. return isset($this->_arr[$key]) ? $this->_arr[$key]['parent'] : NULL;
67. }
68. public function parentValue($key)
69. {
70. return isset($this->_arr[$key]) ? $this->_arr[$key]['data'] : NULL;
71. }
72. private function _createIndex($data, $parent = NULL)
73. {
74. foreach ($data as $key => $value)
75. {
76. $this->_checkIndex($key, $parent, $data);
77. if (is_array($value))
78. {
79. $this->_createIndex($value, $key);
80. }
81. }
82. }
83. private function _checkIndex($key, $parent, $data)
84. {
85. $data = $parent & isset($data[$parent]) ? $data[$parent] : $data;
86. !isset($this->_arr[$key]) & $this->_arr[$key] = array('data' => $data, 'parent' => '');
87. $index = &$this->_arr[$key]['parent'];
88. if (!empty($index))
89. {
90. if (is_array($index))
91. {
92. array_push($index, $parent);
93. }
94. else $index = array($index, $parent);
95. }
96. else $index = $parent;
97. }
98. }
99. $index2 = (Object)new IndexArr($arr);
100. printA($index2->printArr());
101. printP2($index2, 'beijing');
102. printP2($index2, 'name');
103. printP2($index2, 'china');
104. ?>