donglengli0644
2013-10-02 12:59
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$ foo-> bar :: garply()的正确PHP语法是什么?

In PHP 5.3 you can do:

$baz::waldo();

Can you do the equivalent of

 $foo->bar::garply();   //generates an error
 {$foo->bar}::garply();    //this too

without resorting to

$baz = $foo->bar;
$baz::garply();   // while this works
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1条回答 默认 最新

  • dqcuq4138 2013-10-02 13:10
    最佳回答

    Best way to know is to test it : Test demo

    Giving these classes :

    class Foo
    {
        public static function hello()
        {
            echo "Hello !";
        }
    }
    class Bar
    {
        public $apple = null;
    
        public function __construct()
        {
            $this->apple = new Foo();
        }
    }
    

    This will only work from PHP 7.0.0 :

    $foo = new Bar();
    $foo->apple::hello();
    

    You will get this kind of errors with the previous versions :

    Parse error: syntax error, unexpected '::'

    But this :

    $foo = new Bar();
    $baz = $foo->apple;
    $baz::hello();
    

    will work from PHP 5.3.0 : Test demo

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