从给定的父id PHP中查找所有子节点和孙节点

// 定义一个函数，用于查找给定父id的所有子节点和孙节点
function findChildNodes($parentId, $nodes) {
    $result = array();
    
    foreach ($nodes as $node) {
        if ($node['parent_id'] == $parentId) {
            $children = findChildNodes($node['id'], $nodes);
            $node['children'] = $children;
            $result[] = $node;
        }
    }
    
    return $result;
}

// 假设有一个节点数组，每个节点包含id和parent_id属性
$nodes = array(
    array('id' => 1, 'parent_id' => 0),
    array('id' => 2, 'parent_id' => 1),
    array('id' => 3, 'parent_id' => 1),
    array('id' => 4, 'parent_id' => 2),
    array('id' => 5, 'parent_id' => 2),
    array('id' => 6, 'parent_id' => 3),
    array('id' => 7, 'parent_id' => 3),
    array('id' => 8, 'parent_id' => 4),
);

// 调用函数查找id为1的节点的所有子节点和孙节点
$parentId = 1;
$childNodes = findChildNodes($parentId, $nodes);

// 打印结果
print_r($childNodes);