Modifications in object __destruct() not saved PHP [duplicate]

问题

Possible Duplicate:
Pass reference to $this in constructor PHP

I'm working on a simple PHP framework as a learning project. I've got a request object with a method called _execute(). In that method I (among other things) create an object called pageController, call a method on it, and remove the object using the following code:

$controller = new $this->_controllerName($this);
call_user_func(array($controller, $this->_methodName));
unset($controller);

As you can see I pass the current object to the constructor of the new pageController. My constructor is as follows:

public function __construct(Request $request) {
    parent::__construct($request);

    // More stuff
}

The parent's controller is like this:

public function __construct(Request $request) {
    $this->_request = $request;
}

This all works fine, but there is a problem with my destructor. In the pageController I've also got two other methods:

public function __destruct() {
    $this->_render();
}

public function _render($templateName = 'default') {
    $this->_request->_response->_body = $this->_template->_render();
}

My _render() method works great if I call it from within another method in pageController: I can then get the response body from the initial request object using $this->_response->_body. When I call the _render() method from my destructor though, the changes are not changed in the request object. When I call print_r() right after the call to _render(), the changes are somehow visible...

Summarized: Any changes I make to the _request property in the destructor are somehow not changed in the initial request object, which references to the same, since objects are (almost) always not copied but referenced. What am I doing wrong?

Note: I asked a similar question before here, but that questions was not specific enough (because I didn't fully understand the problem then and thanks to some bad testing by myself). I figured I should ask a new, specific, direct question so someone can hopefully help me out.

回答1:

What PHP version are you using? I was not able to duplicate your issue on 5.3.6 with the following code:

class Foo {
    public function __construct(Bar $bar) {
        $this->bar = $bar;
    }
    public function __destruct() {
        $this->bar->value = 'set by Foo::__destruct';
    }
}

class Bar {
    public function __construct() {
        $this->value = 'set by Bar::__construct';
    }
}

$bar = new Bar();
$foo = new Foo($bar);
print $bar->value . PHP_EOL;  // => 'set by Bar::__construct'
unset($foo);
print $bar->value . PHP_EOL;  // => 'set by Foo::__destruct'

Is that along the same lines as what you are attempting to do. If it is... it sounds like maybe some other part of you application logic is interfering.

来源：https://stackoverflow.com/questions/6986334/modifications-in-object-destruct-not-saved-php

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php

oop

destructor