我有这个名为$nested的数组（这是一个很长的数组，但我试图得到一个全面的方案）：
Array
(
[1] => Array
(
[id] => 1
[parent] => 0
[title] => Page 1
)
[2] => Array
(
[id] => 2
[parent] => 0
[title] => Page 2
)
[3] => Array
(
[id] => 3
[parent] => 0
[title] => Page 3
)
[4] => Array
(
[id] => 4
[parent] => 0
[title] => Page 4
)
[5] => Array
(
[id] => 5
[parent] => 0
[title] => Page 5
)
[6] => Array
(
[id] => 6
[parent] => 1
[title] => Page 1-1
)
[7] => Array
(
[id] => 7
[parent] => 1
[title] => Page 1-2
)
[8] => Array
(
[id] => 8
[parent] => 1
[title] => Page 1-3
)
[9] => Array
(
[id] => 9
[parent] => 2
[title] => Page 2-1
)
[10] => Array
(
[id] => 10
[parent] => 2
[title] => Page 2-2
)
[11] => Array
(
[id] => 11
[parent] => 2
[title] => Page 2-3
)
[12] => Array
(
[id] => 12
[parent] => 3
[title] => Page 3-1
)
[13] => Array
(
[id] => 13
[parent] => 3
[title] => Page 3-2
)
[14] => Array
(
[id] => 14
[parent] => 4
[title] => Page 4-1
)
[15] => Array
(
[id] => 15
[parent] => 6
[title] => Page 1-1-1
)
[16] => Array
(
[id] => 16
[parent] => 6
[title] => Page 1-1-2
)
[17] => Array
(
[id] => 17
[parent] => 6
[title] => Page 1-1-3
)
[18] => Array
(
[id] => 18
[parent] => 7
[title] => Page 1-2-1
)
[19] => Array
(
[id] => 19
[parent] => 7
[title] => Page 1-2-2
)
[20] => Array
(
[id] => 20
[parent] => 7
[title] => Page 1-2-3
)
[21] => Array
(
[id] => 21
[parent] => 9
[title] => Page 2-1-1
)
[22] => Array
(
[id] => 22
[parent] => 9
[title] => Page 2-1-2
)
[23] => Array
(
[id] => 23
[parent] => 9
[title] => Page 2-1-3
)
)
使用这个递归函数：
function recursive($parent, $array) {
$has_children = false;
foreach($array as $key => $value) {
if ($value['parent'] == $parent) {
if ($has_children === false && $parent) {
$has_children = true;
echo '<ul>' ."\n";
}
echo '<li>' . "\n";
echo '<a href="/page.php?id=' . $value['id'] . '">' . $value['title'] . '</a>' . " \n";
echo "\n";
recursive($key, $array);
echo "</li>\n";
}
}
if ($has_children === true && $parent) echo "</ul>\n";
}
<ul><?php echo recursive(0, $nested); ?></ul>
我很容易得到这个输出：
到目前为止一切顺利。
现在，我不想一次显示整个树，但是当用户点击页面/子页面时会更深入，如下所示：
网址：http://www.example.com/page.php，初始状态（“展开”所有项目，父级= 0）
网址：http://www.example.com/page.php?id=1（展开parent = 1的所有项目）
网址：http://www.example.com/page.php?id=6（展开parent = 6的所有项目）
等等
对我来说似乎无法完成任务，请帮忙吗？ 提前致谢
答案 0 :(得分：0)
你快到了。只是一个小问题：而不是recursive($key, $array)，您需要recursive($key + 1, $array)。尽管如此，正如其他人所说的那样，如果您只使用PHP生成整个输出然后使用javascript控制它，那将会更好。每次用户点击某个项目时重新加载页面都不是一个好的用户体验。
答案 1 :(得分：0)
最后这就是我所做的，它的工作非常好：
// create array of ancestors' ID from current page
function path($page = 0) {
global $database_connApp, $connApp;
// let's create arrays
do {
mysql_select_db($database_connApp, $connApp);
$query_rsPage = "SELECT pages.pag_id FROM pages WHERE pages.pag_id = " . $page;
$rsPage = mysql_query($query_rsPage, $connApp) or die(mysql_error());
$row_rsPage = mysql_fetch_assoc($rsPage);
$bid[] = $row_rsPage['pag_id'];
$page = $row_rsPage['pag_parent'];
} while ($page > 0);
// move to the last array index
end($bid);
$output = $bid;
return $output;
}
// create the menu
function fmenu($parent, $array, $path) {
$has_children = false;
foreach($array as $key => $value) {
if (in_array($value['parent'], $path)) {
if ($value['parent'] == $parent) {
if ($has_children === false && $parent) {
$has_children = true;
echo '<ul>' ."\n";
}
$active = ($_GET['iData'] == $value['id']) ? ' class="active"' : '';
echo '<li' . $active . '>' . "\n";
echo '<a href="../pagine/' . $value['id'] . '/' . slugify($value['title']) . '.htm">' . html($value['title']) . '</a>' . " \n";
echo "\n";
fmenu($key, $array, $path);
echo "</li>\n";
}
}
}
if ($has_children === true && $parent) echo "</ul>\n";
}
echo fmenu(0, $nested, path($row_rsEdit['pag_id']));