PHP无限极分类

1、数据库设计。

 

2、PHP代码。

//一维数组的形式

 

function tree(&$list, $pid = 0, $level = 0, $html = '----------') {
    static $tree = array();
    foreach ($list as $v) {
        if ($v['pid'] == $pid) {
            $v['level'] = $level;
            $v['html'] = str_repeat($html, $level);
            $tree[] = $v;
            tree($list, $v['id'], $level + 1);
        }
    }
    return $tree;
}

 

//多维数组的形式

function toLayer($cate, $pid = 0){
    $arr = array();
    foreach ($cate as $v){
        if ($v['pid'] == $pid){
            $v['child'] = toLayer($cate, $v['id']);
            $arr[] = $v;
        }
    }
    return $arr;
}