简短的回答

$myObj = new stdClass();

// OR 

$myObj = (object) [
    "foo" => "Foo value",
    "bar" => "Bar value"
];

长回答

我喜欢在JavaScript中创建匿名类型的对象是多么容易:

//JavaScript
var myObj = {
    foo: "Foo value",
    bar: "Bar value"
};
console.log(myObj.foo); //Output: Foo value

所以我总是尝试像javascript一样在PHP中写这种对象:

//PHP >= 5.4
$myObj = (object) [
    "foo" => "Foo value",
    "bar" => "Bar value"
];

//PHP < 5.4
$myObj = (object) array(
    "foo" => "Foo value",
    "bar" => "Bar value"
);

echo $myObj->foo; //Output: Foo value

但由于这基本上是一个数组，你不能像js那样给属性赋匿名函数:

//JavaScript
var myObj = {
    foo: "Foo value",
    bar: function(greeting) {
        return greeting + " bar";
    }
};
console.log(myObj.bar("Hello")); //Output: Hello bar

//PHP >= 5.4
$myObj = (object) [
    "foo" => "Foo value",
    "bar" => function($greeting) {
        return $greeting . " bar";
    }
];
var_dump($myObj->bar("Hello")); //Throw 'undefined function' error
var_dump($myObj->bar); //Output: "object(Closure)"

好吧，你可以这样做，但在我看来并不实用/干净:

$barFunc = $myObj->bar;
echo $barFunc("Hello"); //Output: Hello bar

此外，使用这个语法您可以发现一些有趣的惊喜，但在大多数情况下都可以正常工作。

As others have pointed out, you can use stdClass. However based on the question, it seems like what you really want is to be able to add properties to an object on the fly. You don't need to use stdClass for that, although you can. Really you can use any class. Just create an object instance of any class and start setting properties. I like to create my own class whose name is simply o with some basic extended functionality that I like to use in these cases and is nice for extending from other classes. Basically it is my own base object class. I also like to have a function simply named o(). Like so:

class o {
  // some custom shared magic, constructor, properties, or methods here
}

function o() {
  return new o();
}

If you don't like to have your own base object type, you can simply have o() return a new stdClass. One advantage is that o is easier to remember than stdClass and is shorter, regardless of if you use it as a class name, function name, or both. Even if you don't have any code inside your o class, it is still easier to memorize than the awkwardly capitalized and named stdClass (which may invoke the idea of a 'sexually transmitted disease class'). If you do customize the o class, you might find a use for the o() function instead of the constructor syntax. It is a normal function that returns a value, which is less limited than a constructor. For example, a function name can be passed as a string to a function that accepts a callable parameter. A function also supports chaining. So you can do something like: $result= o($internal_value)->some_operation_or_conversion_on_this_value();

这是基础“语言”构建其他语言层的一个很好的开始，顶层是用完整的内部dsl编写的。这类似于lisp开发风格，PHP对它的支持比大多数人想象的要好得多。我意识到这个问题有点离题，但这个问题涉及到我认为的充分利用PHP功能的基础。

EDIT/UPDATE: I no longer recommend any of this. It makes it hard for static analysis tools and IDEs and custom AST based tools to understand, validate, help you lookup or write your code. Generally magic is bad except in some cases if you are able to get your tools to understand the magic and if it you do it in a standard enough way that even standard community tools will understand it or if your tools are so advanced and full featured that you only use your own tools. Also, I think they are deprecating the ability to add properties to random objects in an upcoming version of PHP, I think it will only work with certain ones, but I don't recommend using that feature anyways.

以类似的方式访问stdClass中的数据 对于关联数组，只需使用{$var}语法。

$myObj = new stdClass;
$myObj->Prop1 = "Something";
$myObj->Prop2 = "Something else";

// then to acces it directly

echo $myObj->{'Prop1'};
echo $myObj->{'Prop2'};

// or what you may want

echo $myObj->{$myStringVar};

你也可以通过解析JSON得到一个空对象:

$blankObject= json_decode('{}');

你也可以试试这种方法。

<?php
     $obj = json_decode("{}"); 
     var_dump($obj);
?>

输出:

object(stdClass)#1 (0) { }

如果你不想这样做:

$myObj = new stdClass();
$myObj->key_1 = 'Hello';
$myObj->key_2 = 'Dolly';

您可以使用以下其中之一:

PHP > = 5.4

$myObj = (object) [
    'key_1' => 'Hello',
    'key_3' => 'Dolly',
];

PHP < 5.4

$myObj = (object) array(
    'key_1' => 'Hello',
    'key_3' => 'Dolly',
);