php无限极目录获取树结构

<?php $items = array (      1 => array ( 'id' => 1, 'pid' => 0, 'name' => '江西省' ),      2 => array ( 'id' => 2, 'pid' => 0, 'name' => '黑龙江省' ),      3 => array ( 'id' => 3, 'pid' => 1, 'name' => '南昌市'

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