好的，这是一个脚本，让您像我几分钟一样沉迷其中。看评论！它解释了脚本中的所有内容。老实说，当我复制了你的数组结构时，应该立即工作，但请阅读并理解它，不要只是盲目地复制和粘贴，你不会那样学习任何东西（我通常不会提供完整的工作代码，但这很难解释）。
<?php
/**
* Heres your categories array structure, they can be in any order as we will sort them into an hierarchical structure in a moment
*/
$categories = array();
$categories[] = array('id'=>5, 'parent_id' => 4, 'name' => 'Bedroom wear', 'slug' => 'bwear', 'status' => 1);
$categories[] = array('id'=>6, 'parent_id' => 3, 'name' => 'Rolex', 'slug' => 'rolex', 'status' => 1);
$categories[] = array('id'=>1, 'parent_id' => 0, 'name' => 'Men', 'slug' => 'men', 'status' => 1);
$categories[] = array('id'=>2, 'parent_id' => 0, 'name' => 'Women', 'slug' => 'women', 'status' => 1);
$categories[] = array('id'=>3, 'parent_id' => 1, 'name' => 'Watches', 'slug' => 'watches', 'status' => 1);
$categories[] = array('id'=>4, 'parent_id' => 2, 'name' => 'Bras', 'slug' => 'bras', 'status' => 1);
$categories[] = array('id'=>7, 'parent_id' => 2, 'name' => 'Jackets', 'slug' => 'jackets', 'status' => 1);
/**
* This function takes the categories and processes them into a nice tree like array
*/
function preprocess_categories($categories) {
// First of all we sort the categories array by parent id!
// We need the parent to be created before teh children after all?
$parent_ids = array();
foreach($categories as $k => $cat) {
$parent_ids[$k] = $cat['parent_id'];
}
array_multisort($parent_ids, SORT_ASC, $categories);
/* note: at this point, the categories are now sorted by the parent_id key */
// $new contains the new categories array which you will pass into the tree function below (nothign fancy here)
$new = array();
// $refs contain references (aka points) to places in the $new array, this is where the magic happens!
// without references, it would be difficult to have a completely random mess of categories and process them cleanly
// but WITH references, we get simple access to children of children of chilren at any point of the loop
// each key in this array is teh category id, and the value is the "children" array of that category
// we set up a default reference for top level categories (parent id = 0)
$refs = array(0=>&$new);
// Loop teh categories (easy peasy)
foreach($categories as $c) {
// We need the children array so we can make a pointer too it, should any children categories popup
$c['children'] = array();
// Create the new entry in the $new array, using the pointer from $ref (remember, it may be 10 levels down, not a top level category) hence we need to use the reference/pointer
$refs[$c['parent_id']][$c['id']] = $c;
// Create a new reference record for this category id
$refs[$c['id']] = &$refs[$c['parent_id']][$c['id']]['children'];
}
return $new;
}
/**
* This function generates our HTML from the categories array we have pre-processed
*/
function tree($categories, $baseurl = '/category/') {
$tree = "<ul>";
foreach($categories as $category) {
$tree .= "<li>";
$tree .= "<a href='".$baseurl.$category['slug']."'>".$category['name']."</a>";
// This is the magci bit, if there are children categories, the function loops back on itself
// and processes the children as if they were top level categories
// we append the children to the main tree string rather tha echoing for this reason
// we also pass the base url PLUS our category slug as the "new base url" so it can build the URL correctly
if(!empty($category['children'])) {
$tree .= tree($category['children'], $baseurl.$category['slug'].'/');
}
$tree .= "</li>";
}
$tree .= "</ul>";
return $tree;
}
///echo "<pre>"; print_r(preprocess_categories($categories)); die();
echo tree( preprocess_categories( $categories ) );
?>
如果您喜欢漂亮的彩色代码，这是一个 pastebin 链接：http: //pastebin.com/KVhCuvs3