php写的无限级selectTree类

3. /*

4. author: nick
5. 功能：生成SeletTree
6. 属性:
7. $result 结果集
8. $id_field 自身id字段
9. $parent_field 父类id字段
10. $option_text 选项显示名称
11. $select_name 下拉菜单的名称
12. $elected 默认选中
13. $no_top 是否需要顶层选项
14. $level 层深度
15. $parent_id 同层中的id
16. */
17. class SelectTree{
18. public $result;
19. public $select_name;
20. public $option_text;
21. public $elected;
22. public $id_field;
23. public $parent_field;
24. public $no_top;
25. public $level;
26. public $parent_id;
27. public $getarray;
28. function __construct($result,$id_field,$parent_field,$option_text,$select_name='',$elected=0,$no_top=0,$level=0,$parent_id=0){
29. $this->result =$result;
30. $this->id_field =$id_field;
31. $this->parent_field =$parent_field;
32. $this->option_text =$option_text;
33. $this->select_name =$select_name;
34. $this->elected =$elected;
35. $this->no_top =$no_top;
36. $this->level =$level;
37. $this->parent_id =$parent_id;
38. $this->getarray =self::getArray();
39. }

40. /*

41. 功能：返回Tree二维数组
42. */
43. function getArray(){
44. $arrays=array();
45. while($row=mysql_fetch_array($this->result)){
46. $arrays[$row[$this->parent_field]][$row[$this->id_field]]=$row;
47. }
48. return $arrays;
49. }

50. /*

51. 功能：获取SelectTree
52. */
53. function getSelectTree(){
54. $tree = '';
    if($no_top){
    $tree .= '
    最顶层';
    }
    self::buildTree($this->getarray,&$tree,$this->id_field,$this->option_text,$this->selected,$this->level,$this->parent_id); //生成树状结构
    $tree .= '
    ';
55. return $tree;
56. }

57. /*

58. 功能：递归构建树状结构
59. */
60. function buildTree($array,&$tree,$option_value,$option_text,$selected,$level=0,$parent_id=0){
61. if(is_array($array[$parent_id])){
62. for($i=0;$i$space .= ' '; //选项缩进深度
63. foreach($array[$parent_id] as $key => $value){
64. if($value[$option_value] == $selected){
65. $tree .= ''.$space.$value[$option_text]."";
66. }else{
67. $tree .= ''.$space.$value[$option_text]."";
68. }
69. $tree .=self::buildTree($array,&$tree,$option_value,$option_text,$selected,$level+1,$key);
70. }
71. }else{
72. $tree .= '';
73. }
74. }
75. }

76. /*----------*/

77. header("CONTENT-TYPE:TEXT/HTML;CHARSET=UTF-8");
78. mysql_connect("localhost","root","root");
79. mysql_select_db("tree");
80. mysql_query('set names utf8');
81. $result = mysql_query("select * from tvmenu");
82. $tree=new SelectTree($result,'id','bid','name','tree');
83. echo $tree->getSelectTree();
84. ?>

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