php通过递归查找父集分类

php 查找子分类下所有父集分类

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<code><span><span>function</span><span>get_parent_id</span><span>(<span>$cid</span>)</span>{</span><span>global</span><span>$db</span>;
    <span>$pids</span> = <span>''</span>;
    <span>$parent_id</span> = <span>$db</span> -> getOne(<span>"select parent_id from eload_category where cat_id = '"</span>.<span>$cid</span>.<span>"'"</span>);
    <span>if</span>( <span>$parent_id</span> != <span>''</span> ){
        <span>$pids</span> .= <span>$parent_id</span>;
        <span>$npids</span> = get_parent_id( <span>$parent_id</span> );
        <span>if</span>(<span>isset</span>(<span>$npids</span>))
            <span>$pids</span> .= <span>','</span>.<span>$npids</span>;
    }
    <span>return</span><span>$pids</span>;
}</code>

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