//数据库最常见的设计，比如无限级分类
$arr = array(array('id'=>15,'lan'=>'语言','pid'=>0),
array('id'=>16,'lan'=>'java','pid'=>15),
array('id'=>18,'lan'=>'php','pid'=>15),
array('id'=>19,'lan'=>'java测试','pid'=>16),
array('id'=>20,'lan'=>'php测试','pid'=>18),
);
array (size=5)
0 =>
array (size=3)
'id' => int 15
'lan' => string '语言' (length=6)
'pid' => int 0
1 =>
array (size=3)
'id' => int 16
'lan' => string 'java' (length=4)
'pid' => int 15
2 =>
array (size=3)
'id' => int 18
'lan' => string 'php' (length=3)
'pid' => int 15
3 =>
array (size=3)
'id' => int 19
'lan' => string 'java测试' (length=10)
'pid' => int 16
4 =>
array (size=3)
'id' => int 20
'lan' => string 'php测试' (length=9)
'pid' => int 18
//语言
//java
//java测试
//php
// php测试
//问题如何组成
array (size=5)
0 =>
array (size=3)
'id' => int 0
'lan' => string '语言' (length=6)
'pid' => int 0
1 =>
array (size=3)
'id' => int 1
'lan' => string 'java' (length=4)
'pid' => int 0
2 =>
array (size=3)
'id' => int 2
'lan' => string 'php' (length=3)
'pid' => int 0
3 =>
array (size=3)
'id' => int 3
'lan' => string 'java测试' (length=10)
'pid' => int 1
4 =>
array (size=3)
'id' => int 4
'lan' => string 'php测试' (length=9)
'pid' => int 2
$arr1 = array(
array('id'=>0,'lan'=>'语言','pid'=>0),
array('id'=>1,'lan'=>'java','pid'=>0),
array('id'=>2,'lan'=>'php','pid'=>0),
array('id'=>3,'lan'=>'java测试','pid'=>1),
array('id'=>4,'lan'=>'php测试','pid'=>2),
);
估计没人能懂,也就是说id和pid重新开始了 最佳答案
