直接上代码 + 示例

<?php/*** php递归生成树形结构 - 无限分类 - 构建树形结构 - 省市区三级联动* * @param array $lists 一维数组，包括不同级别的各行数据* @param int $parentId 目标节点的父类ID (可以是顶级分类的父ID，也可以是任意节点的父ID)* @param string $keyParentId 数组下标 - 父类ID* @param string $keySonId 数组下标 - 父类ID* @param string $keyChildren 数组新增下标 - 子节点下标* * @author Rudon* @link https://rudon.blog.csdn.net/*/function getTree($lists, $parentId = 0, $keyParentId = 'parent_id', $keySonId = 'id', $keyChildren = 'children') {$tree = [];foreach($lists as $k => $v){if(array_key_exists($keySonId, $v) && array_key_exists($keyParentId, $v) && $v[$keyParentId] == $parentId) {$v[$keyChildren] = getTree($lists, $v[$keySonId], $keyParentId, $keySonId, $keyChildren);$tree[] = $v;}}return $tree;}// 示例$rows = array(array('id' => 1, 'parent_id' => 0, 'name' => '河北省'),array('id' => 2, 'parent_id' => 0, 'name' => '北京市'),array('id' => 3, 'parent_id' => 1, 'name' => '邯郸市'),array('id' => 4, 'parent_id' => 2, 'name' => '朝阳区'),array('id' => 5, 'parent_id' => 2, 'name' => '通州区'),array('id' => 6, 'parent_id' => 4, 'name' => '望京'),array('id' => 7, 'parent_id' => 4, 'name' => '酒仙桥'),array('id' => 8, 'parent_id' => 3, 'name' => '永年区'),array('id' => 9, 'parent_id' => 1, 'name' => '武安市'),array('id' => 10, 'parent_id' => 8, 'name' => '永年区镇'),array('id' => 11, 'parent_id' => 0, 'name' => '上海市'));// 获取所有省市区关系$tree = getTree($rows, 0);echo "<pre>";print_r($tree);echo "</pre>";// 获取北京市(ID=2)的各下级// $tree = getTree($rows, 2);// 结果/*** Array([0] => Array([id] => 1[parent_id] => 0[name] => 河北省[children] => Array([0] => Array([id] => 3[parent_id] => 1[name] => 邯郸市[children] => Array([0] => Array([id] => 8[parent_id] => 3[name] => 永年区[children] => Array([0] => Array([id] => 10[parent_id] => 8[name] => 永年区镇[children] => Array())))))[1] => Array([id] => 9[parent_id] => 1[name] => 武安市[children] => Array())))[1] => Array([id] => 2[parent_id] => 0[name] => 北京市[children] => Array([0] => Array([id] => 4[parent_id] => 2[name] => 朝阳区[children] => Array([0] => Array([id] => 6[parent_id] => 4[name] => 望京[children] => Array())[1] => Array([id] => 7[parent_id] => 4[name] => 酒仙桥[children] => Array())))[1] => Array([id] => 5[parent_id] => 2[name] => 通州区[children] => Array())))[2] => Array([id] => 11[parent_id] => 0[name] => 上海市[children] => Array()))* */