php - 传递对私有数组的引用

Question

我必须承认，关于 PHP 的“引用传递”的所有困惑都影响了我，现在我还不清楚。我会想到以下代码：

class TestClass {

    private $my_precious = array ('one','two','three');

    public function &give_reference() {
        return $this->my_precious;
    }

}

$foobar = new TestClass();
$my_ref = $foobar->give_reference();
$my_ref = array ("four", "five", "six");

echo print_r($foobar,true);

会打印：

TestClass Object
(
    [my_precious:TestClass:private] => Array
        (
            [0] => four
            [1] => five
            [2] => six
        )

)

但是，唉，我的参考似乎没有持久力，而只是回声：

TestClass Object
(
    [my_precious:TestClass:private] => Array
        (
            [0] => one
            [1] => two
            [2] => three
        )

)

我怎样才能使这项工作？

Answer 1

您还必须通过引用分配：

$my_ref =& $foobar->give_reference();

Answer 2

尝试：

class TestClass {

    private $my_precious = array ('one','two','three');

    public function & give_reference() {
        return $this->my_precious;
    }

}

$foobar = new TestClass();
$my_ref = & $foobar->give_reference();
$my_ref = array ("four", "five", "six");

echo print_r($foobar,true);