Recursive sub-columns in Simple infinite classification

2. <?php
4.   
6. /* 
8. * Find sub-columns
10.  */  
12.   
14. $area=array(
16. Array(' id'=>1,' name '='China ' ,' parent '=>0),
18. Array(' id'=>2,' name '='Guangdong ' ,' parent '=>1),
20. Array(' id '=>3,' name '='shenzhen ', ' Parent ' =>2),
22. Array(' id'=>4,' name '='Hunan ' ,' parent '=>1),
24. Array(' id'=>5,' name '='Changsha ' ,' parent '=>4)
26. );
28.   
30. function findson ($arr,$id=0) {
32. $son=array();
34. foreach ( $arr as $value) {
36. if ($value[' parent ']==$id ) {  
38. $son[]=$value;
40.         }  
42.     }  
44. return $son;
46. }  
48.   
50. /* 
52. * Find a descendant tree
54. * @param array passed in by array
56. * @param int ID passed in
58.  */  
60.   
62. function substree ($arr,$id=0,$level =1) {
64. static $grandson=array();
66.       
68. foreach ( $arr as $value) {
70. if ($value[' parent ']==$id ) {  
72. $value[' level ']=$level;
74. $grandson[]=$value;
76. Substree ($arr,$value[' id '],$level +1);
78.         }  
80.     }  
82. return $grandson;
84. }  
86.   
88. //var_dump (Findson ($area, 1));   
90. echo "</br>";
92. //var_dump (Substree ($area, 2));   
94.   
96. /* 
98. * In order for it to show indentation effect
100.  */  
102. $tt=substree ($area, 0, 1);
104.   
106. foreach ( $tt as $value) {
108. echo str_repeat (", $value [" Level "]). $value ["name"]. "</br>"  ;
110.    }  
112.      
114. ?>
     

Recursive sub-columns in Simple infinite classification