以前从来没写过递归（其实想想，对算法完全没概念），刚好有这个需求，试着写了一下，发现也挺容易的，特别记录一下。
数据库是dedecms默认的，dede_arctype是保存栏目的表，reid是栏目的父级栏目id。
<span><span>$array</span> = <span>array</span><span>();
get_sons(</span><span>$type</span>, <span>$array</span><span>);
</span><span>var_dump</span>(<span>$array</span><span>);
</span><span>function</span> get_sons(<span>$type</span>, &<span>$current_array</span><span>){
</span><span>$result</span> = <span>mysql_query</span>("select id from dede_arctype where reid = {<span>$type</span>}"<span>);
</span><span>while</span>(<span>$row</span> = <span>mysql_fetch_assoc</span>(<span>$result</span><span>)){
</span><span>$current_array</span>[] = <span>$row</span>['id'<span>];
get_sons(</span><span>$row</span>['id'], <span>$current_array</span><span>);
}
}</span></span>
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