The recursive generation of breadcrumb----

1. First understanding of what is breadcrumb navigation

You can see that the crumbs are actually all the superior categories of the current viewing article a simple classification list is generally composed of ID name PID so it can be recursively queried
The following code is based on the thinkphp

Public function Class ($id) {
        $res = $this->gettree ($id);//
        Dump (Array_reverse ($res));//The result flashback
    }

    The Public Function Gettree ($id) {
        static $res = Array ();//static variable  does not disappear for each initialization of metadata
        $info = M (' Ushop_class ')-> Field (' Id,pid,name ')->find ($id);
        $res [] = $info;
        if ($info [' pid ']>0] {//pid is greater than 0  must be subordinate classification
            $this->gettree ($info [' pid ']);//recursive return
            $res;
        }
    }

The returned category spanning tree plus the current article name can be used in the foreground