栏目数组:
$arr=Array( Array("cid" => 2,"cname" => "新闻","pid" => 0), Array("cid" => 4,"cname" =>"体育","pid" => 0), Array("cid" => 5,"cname" => "娱乐","pid" => 0), Array("cid" => 7,"cname" => "热点新闻","pid" =>2), Array("cid" => 8,"cname" => "小众新闻","pid" => 2), Array("cid" => 9,"cname" => "民谣新闻","pid" => 8),);<?php$arr=Array( Array("cid" => 2,"cname" => "新闻","pid" => 0), Array("cid" => 4,"cname" =>"体育","pid" => 0), Array("cid" => 5,"cname" => "娱乐","pid" => 0), Array("cid" => 7,"cname" => "热点新闻","pid" =>2), Array("cid" => 8,"cname" => "小众新闻","pid" => 2), Array("cid" => 9,"cname" => "民谣新闻","pid" => 8),);function formatTree($array, $pid = 0,$level = 1,$field = array("pid"=>"pid","id"=>"id","children"=>"children")){ $arr = array(); foreach ($array as &$v) { if ($v[$field["pid"]] == $pid) { $v["level"] = $level; $tem = formatTree($array, $v[$field["id"]],$v["level"]+1,$field); //判断是否存在子数组 $tem && $v[$field["children"]] = $tem; $arr[] = $v; } } return $arr; }$tree = formatTree( $arr,0,1, $field = array("pid"=>"pid","id"=>"cid","children"=>"children") );echo "<pre>";print_r( $tree); ?> 我们有两个方法来进行软件设计：一个是让其足够的简单以至于让BUG无法藏身；另一个就是让其足够的复杂，让人找不到BUG。前者更难一些。
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