php递归方法实现无限分类实例

数组代码如下:

<?php
$items = array(
    array(
        &#39;id&#39; => 1,
        &#39;pid&#39; => 0,
        &#39;name&#39; => &#39;一级11&#39;
    ) ,
    array(
        &#39;id&#39; => 11,
        &#39;pid&#39; => 0,
        &#39;name&#39; => &#39;一级12&#39;
    ) ,
    array(
        &#39;id&#39; => 2,
        &#39;pid&#39; => 1,
        &#39;name&#39; => &#39;二级21&#39;
    ) ,
    array(
        &#39;id&#39; => 10,
        &#39;pid&#39; => 11,
        &#39;name&#39; => &#39;二级22&#39;
    ) ,
    array(
        &#39;id&#39; => 3,
        &#39;pid&#39; => 1,
        &#39;name&#39; => &#39;二级23&#39;
    ) ,
    array(
        &#39;id&#39; => 12,
        &#39;pid&#39; => 11,
        &#39;name&#39; => &#39;二级24&#39;
    ) ,
    array(
        &#39;id&#39; => 13,
        &#39;pid&#39; => 12,
        &#39;name&#39; => &#39;三级31&#39;
    ) ,
    array(
        &#39;id&#39; => 9,
        &#39;pid&#39; => 1,
        &#39;name&#39; => &#39;二级25&#39;
    ) ,
);
?>

函数代码如下:

<?php
function formatTree($array, $pid = 0) {
    $arr = array();
    $tem = array();
    foreach ($array as $v) {
        if ($v[&#39;pid&#39;] == $pid) {
            $tem = formatTree($array, $v[&#39;id&#39;]);
            //判断是否存在子数组
            $tem && $v[&#39;son&#39;] = $tem;
            $arr[] = $v;
        }
    }
    return $arr;
}
?>

其中,数组一定要包含id和pid用以指定数组值之间的层级关系.

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