Comments on: PHP: Creating a singleton class for serialization

By: mojo

mojo — Wed, 16 Jul 2008 17:10:44 +0000

For me that works fine. Even if it might not 100% be the idea of a singleton pattern

By: mojo

mojo — Wed, 16 Jul 2008 16:42:47 +0000

try this:
public function __wakeup()
{
if( isset($this->me) ) self::$instance = $this->me;
}

public function __sleep()
{
$this->me = self::$instance;

return array_keys(get_object_vars($this));
}

By: beginner

beginner — Tue, 26 Feb 2008 10:02:06 +0000

@ploceus: Well... I guess, now I can imagine what might have caused a trouble for you. In PHP 5.1.6 you cannot call register_shutdown_function from a static class method. Instead, you have to pass an array of the class name and the function name. An explanation and examples are found here. They say this works in PHP 4 too! As of PHP 5.2.3 one can simply pass 'ClassName::methodName', and it would work.

By: beginner

beginner — Tue, 26 Feb 2008 08:31:26 +0000

Thanks, you saved me a lot of time! Your example works smoothly for me.

@ploceus: Static variables are not saved on serialization and, thus, not loaded on unserialization. However, one could try to mimic the feature by storing them manually in the object with __sleep() function and restoring in the __wakeup() function or, if that doesn’t work, in the setInstance(). Personally, the only static variable I have is the reference to an instance of my class, and everything works as it should.

By: ploceus

ploceus — Fri, 07 Dec 2007 21:08:39 +0000

Does not seem to be working and tried everything and still does not work.
The first page load serializes ok. The second page load, where the first part of if statement is processed, shows up blank. How does static variables from first page get loaded on unserializing?