我有数组:
$array = array(
0 => 'aaa',
1 => 'bbb',
2 => 'ccc',
3 => 'ddd'
);
我怎样才能从这个数组中制作树?我想收到:
$array = array(
0 => 'aaabbbcccddd',
1 => 'aaabbbccc',
2 => 'aaabbb',
3 => 'aaa'
);