如何将嵌套数组树嵌入到嵌套对象树中？

Question

这是我的代码：

$adjacencies = array (  "0" => array(   "name1" => "pear",
                                        "name2" => "jack",
                                        "data" => array()   ),
                        "1" => array(   "name1" => "pear",
                                        "name2" => "john",
                                        "data" => array()   )
                    );

$final_array['adjacencies'] = $adjacencies;
echo "<pre>";
print_r(json_encode($final_array));

这是上面代码的结果：

如您所见，data的值为[]，而我想要此{}。我怎么能这样做？

Answer 1

虽然我不确定你的问题背后的原因是什么， 而不是将data键设置为数组，只需将其定义为新对象。

$adjacencies = array (  "0" => array(   "name1" => "pear",
                                        "name2" => "jack",
                                        "data" => new stdClass()   ),
                        "1" => array(   "name1" => "pear",
                                        "name2" => "john",
                                        "data" => new stdClass()   )
                    );

$final_array['adjacencies'] = $adjacencies;
echo "<pre>";
print_r(json_encode($final_array));

<强>来源：

http://php.net/manual/en/language.types.object.php#107071

Answer 2

如果它适合你（或stdClass），你可以使用ArrayObject。

PHP Manual for ArrayObject

例如：

php > echo json_encode([[],[]]);
[[],[]]
php > echo json_encode([ new ArrayObject(), new ArrayObject()]);
[{},{}]