Passing arguments to the Class Constructor

How can I pass a arbitrary number of arguments to the class constructor using the Object() function defined below?

<?php

/*
./index.php
*/

function Object($object)
{
    static $instance = array();

    if (is_file('./' . $object . '.php') === true)
    {
     $class = basename($object);

     if (array_key_exists($class, $instance) === false)
     {
      if (class_exists($class, false) === false)
      {
       require('./' . $object . '.php');
      }

      /*
      How can I pass custom arguments, using the
      func_get_args() function to the class constructor?

      $instance[$class] = new $class(func_get_arg(1), func_get_arg(2), ...);
      */

      $instance[$class] = new $class();
     }

     return $instance[$class];
    }

    return false;
}

/*
How do I make this work?
*/

Object('libraries/DB', 'DATABASE', 'USERNAME', 'PASSWORD')->Query(/* Some Query */);

/*
./libraries/DB.php
*/

class DB
{
    public function __construct($database, $username, $password, $host = 'localhost', $port = 3306)
    {
     // do stuff here
    }
}

?>

From stackoverflow

• Instead of your class taking separated parameters I'd have it take an array.

  class DB
  {
      public function __construct(array $params)
      {
          // do stuff here
      }
  }
  

  That way you can pass the direct result of the func_get_args into your constructor. The only problem now is being able to figure out the array key / values.

  If anyone else has any ideas I'd also be delighted to know :)

  Alix Axel : I got the same idea as well but I was curious to know if something like I described could be done.

• I haven't tried this, but call_user_func_array sounds like you want.

  $thing = call_user_func_array(array($classname, '__construct'), $args);
  

  Have a look in the PHP Documentation.

  Alix Axel : Doesn't work. =\ call_user_func_array(array(new $classname(), '__construct'), $args); This works but then I would be calling the constructor twice.

  staticsan : Try it without new $classname().

  Alix Axel : Fatal error: Non-static method test::__construct() cannot be called statically

  staticsan : Okay, I've got no more ideas. Thanks for being willing to try.

• $klass = new ReflectionClass($classname);
  $thing = $klass->newInstanceArgs($args);
  

  Although the need to use reflection suggests that you are overcomplicating something in your design. Why do you want to write this function in the first place?

  Alix Axel : I admit this function may seem a bit nonsense but I use it for small stuff where a framework may be too bloated. And since it acts as an "autoloader", object constructor and singleton container it does the job perfectly.

  Alix Axel : BTW, that Reflection class is really handy, is there any crash course available on the new features of PHP 5.3? I checked the PHP manual but is it me or it is lacking a lot of documentation?

  troelskn : It's not you: The documentation is rather sparse on that. You'll have to do with http://www.php.net/oop5.reflection. Also, it has been around since 5.1 (or is it 5.0?), so it's not a new feature of 5.3