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@ 2017-07-06T03:58:32Z

<?php

class Hello2
{
    public function sayHello()
    {
        echo 'Hello ';
    }
}

class World2
{
    public function sayWorld()
    {
        echo 'World';
    }
}

class MyHelloWorld2
{
    public $hello;

    public $world;

    public function __construct()
    {
        $this->hello = new Hello2();
        $this->world = new World2();
    }

    public function sayExclamationMark()
    {
        echo '!';
    }

    public function __call($name, $arguments)
    {
        if (method_exists($this->hello, $name)) {
            var_dump('$this->hello->'.$name.'()');
            // $this->hello->sayHello();

            // 这个是可行的
            // return $this->hello->sayHello();

            // 这个就报错了
            //return $this->hello->$name.'()';
            return $this->hello->$name();
        }

        if (method_exists($this->world, $name)) {
            // return $this->world->$name();
            
            // 或者这样写
            return call_user_func([$this->word, $name]);
        }

        if (!method_exists($this->hello, $name) && !method_exists($this->world, $name)) {
            echo '不存在此方法';
        }
    }
}

$obj = new MyHelloWorld2();
$obj->sayHello();
$obj->sayWorld();
$obj->sayExclamationMark();

// 输出：
// Hello World!

Output for git.master, git.master_jit, rfc.property-hooks: string(24) "$this->hello->sayHello()" Hello Warning: Undefined property: MyHelloWorld2::$word in /in/ggqAu on line 54 Fatal error: Uncaught TypeError: call_user_func(): Argument #1 ($callback) must be a valid callback, first array member is not a valid class name or object in /in/ggqAu:54 Stack trace: #0 /in/ggqAu(65): MyHelloWorld2->__call('sayWorld', Array) #1 {main} thrown in /in/ggqAu on line 54
Process exited with code 255.

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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