在 PHP 中的对象上使用 json_encode（不考虑范围）
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Using json_encode on objects in PHP (regardless of scope)
提问by A. Rager
I'm trying to output lists of objects as json and would like to know if there's a way to make objects usable to json_encode? The code I've got looks something like
我正在尝试将对象列表输出为 json 并且想知道是否有办法使对象可用json_encode？我得到的代码看起来像
$related = $user->getRelatedUsers();
echo json_encode($related);
Right now, I'm just iterating through the array of users and individually exporting them into arrays for json_encodeto turn into usable json for me. I've already tried making the objects iterable, but json_encodejust seems to skip them anyway.
现在，我只是遍历用户数组并将它们单独导出到数组中，json_encode以便为我变成可用的 json。我已经尝试过使对象可迭代，但json_encode似乎还是跳过了它们。
edit: here's the var_dump();
编辑：这是 var_dump();
php > var_dump($a);
object(RedBean_OODBBean)#14 (2) {
["properties":"RedBean_OODBBean":private]=>
array(11) {
["id"]=>
string(5) "17972"
["pk_UniversalID"]=>
string(5) "18830"
["UniversalIdentity"]=>
string(1) "1"
["UniversalUserName"]=>
string(9) "showforce"
["UniversalPassword"]=>
string(32) ""
["UniversalDomain"]=>
string(1) "0"
["UniversalCrunchBase"]=>
string(1) "0"
["isApproved"]=>
string(1) "0"
["accountHash"]=>
string(32) ""
["CurrentEvent"]=>
string(4) "1204"
["userType"]=>
string(7) "company"
}
["__info":"RedBean_OODBBean":private]=>
array(4) {
["type"]=>
string(4) "user"
["sys"]=>
array(1) {
["idfield"]=>
string(2) "id"
}
["tainted"]=>
bool(false)
["model"]=>
object(Model_User)#16 (1) {
["bean":protected]=>
*RECURSION*
}
}
}
and here's what json_encode gives me:
这是 json_encode 给我的：
php > echo json_encode($a);
{}
I ended up with just this:
我最终得到了这个：
function json_encode_objs($item){
if(!is_array($item) && !is_object($item)){
return json_encode($item);
}else{
$pieces = array();
foreach($item as $k=>$v){
$pieces[] = "\"$k\":".json_encode_objs($v);
}
return '{'.implode(',',$pieces).'}';
}
}
It takes arrays full of those objects or just single instances and turns them into json - I use it instead of json_encode. I'm sure there are places I could make it better, but I was hoping that json_encode would be able to detect when to iterate through an object based on its exposed interfaces.
它需要包含这些对象或单个实例的数组并将它们转换为 json - 我使用它而不是 json_encode。我确信有一些地方我可以让它变得更好，但我希望 json_encode 能够根据对象的公开接口检测何时迭代它。
采纳答案by Gabor de Mooij
In RedBeanPHP 2.0 there is a mass-export function which turns an entire collection of beans into arrays. This works with the JSON encoder..
在 RedBeanPHP 2.0 中有一个批量导出函数，可以将整个 bean 集合转换为数组。这适用于 JSON 编码器..
json_encode( R::exportAll( $beans ) );
回答by jondavidjohn
All the properties of your object are private. aka... not available outside their class's scope.
您对象的所有属性都是私有的。又名......在他们班级的范围之外不可用。
Solution for PHP < 5.4
PHP < 5.4 的解决方案
If you do want to serialize your private and protected object properties, you have to implement a JSON encoding function insideyour Class that utilizes json_encode()on a data structure you create for this purpose.
如果您确实想要序列化您的私有和受保护对象属性，您必须在您的类中实现一个 JSON 编码函数，该函数利用json_encode()您为此目的创建的数据结构。
class Thing {
...
public function to_json() {
return json_encode(array(
'something' => $this->something,
'protected_something' => $this->get_protected_something(),
'private_something' => $this->get_private_something()
));
}
...
}
Solution for PHP >= 5.4
PHP >= 5.4 的解决方案
Use the new JsonSerializableInterface to provide your own json representation to be used by json_encode
使用新JsonSerializable接口提供您自己的 json 表示以供使用json_encode
class Thing implements JsonSerializable {
...
public function jsonSerialize() {
return [
'something' => $this->something,
'protected_something' => $this->get_protected_something(),
'private_something' => $this->get_private_something()
];
}
...
}
回答by ilanco
In PHP >= 5.4.0 there is a new interface for serializing objects to JSON : JsonSerializable
在 PHP >= 5.4.0 中有一个用于将对象序列化为 JSON 的新接口：JsonSerializable
Just implement the interface in your object and define a JsonSerializablemethod which will be called when you use json_encode.
只需在您的对象中实现接口并定义一个JsonSerializable将在您使用时调用的方法json_encode。
So the solutionfor PHP >= 5.4.0 should look something like this:
所以PHP >= 5.4.0的解决方案应该是这样的：
class JsonObject implements JsonSerializable
{
// properties
// function called when encoded with json_encode
public function jsonSerialize()
{
return get_object_vars($this);
}
}
回答by user2944142
Following code worked for me:
以下代码对我有用：
public function jsonSerialize()
{
return get_object_vars($this);
}
回答by chrisfargen
I didn't see this mentioned yet, but beans have a built-in method called getProperties().
我还没有看到提到这一点，但是 bean 有一个名为getProperties().
So, to use it:
因此，要使用它：
// What bean do we want to get?
$type = 'book';
$id = 13;
// Load the bean
$post = R::load($type,$id);
// Get the properties
$props = $post->getProperties();
// Print the JSON-encoded value
print json_encode($props);
This outputs:
这输出：
{
"id": "13",
"title": "Oliver Twist",
"author": "Charles Dickens"
}
Now take it a step further. If we have an array of beans...
现在更进一步。如果我们有一个bean数组......
// An array of beans (just an example)
$series = array($post,$post,$post);
...then we could do the following:
...然后我们可以执行以下操作：
Loop through the array with a
foreachloop.Replace each element (a bean) with an array of the bean's properties.
用循环遍历数组
foreach。将每个元素（一个 bean）替换为 bean 属性的数组。
So this...
所以这...
foreach ($series as &$val) {
$val = $val->getProperties();
}
print json_encode($series);
...outputs this:
...输出这个：
[
{
"id": "13",
"title": "Oliver Twist",
"author": "Charles Dickens"
},
{
"id": "13",
"title": "Oliver Twist",
"author": "Charles Dickens"
},
{
"id": "13",
"title": "Oliver Twist",
"author": "Charles Dickens"
}
]
Hope this helps!
希望这可以帮助！
回答by Phoenix
I usually include a small function in my objects which allows me to dump to array or json or xml. Something like:
我通常在我的对象中包含一个小函数，它允许我转储到数组、json 或 xml。就像是：
public function exportObj($method = 'a')
{
if($method == 'j')
{
return json_encode(get_object_vars($this));
}
else
{
return get_object_vars($this);
}
}
either way, get_object_vars()is probably useful to you.
无论哪种方式，get_object_vars()都可能对您有用。
回答by Asahajit
$products=R::findAll('products');
$string = rtrim(implode(',', $products), ',');
echo $string;
回答by Andrei
Here is my way:
这是我的方法：
function xml2array($xml_data)
{
$xml_to_array = [];
if(isset($xml_data))
{
if(is_iterable($xml_data))
{
foreach($xml_data as $key => $value)
{
if(is_object($value))
{
if(empty((array)$value))
{
$value = (string)$value;
}
else
{
$value = (array)$value;
}
$value = xml2array($value);
}
$xml_to_array[$key] = $value;
}
}
else
{
$xml_to_array = $xml_data;
}
}
return $xml_to_array;
}
回答by Greg
for an array of objects, I used something like this, while following the custom method for php < 5.4:
对于一组对象，我使用了这样的方法，同时遵循 php < 5.4 的自定义方法：
$jsArray=array();
//transaction is an array of the class transaction
//which implements the method to_json
foreach($transactions as $tran)
{
$jsArray[]=$tran->to_json();
}
echo json_encode($jsArray);
