Copy Constructor

CopyConstructor

<?

class myClass
{
    //Allowed names for using __set
	protected static $allowedSetValues = array(
		//Member Variables
		'userName',

		//Other class dependencies
		'mysqli'
		);

	//Allowed names for using __get
	protected static $allowedGetMethods = array();


	//An array that stores all the member variables to allow __set and __get work correctly
	protected $memberVars;


	protected function __construct()
	{
		foreach (self::$allowedSetValues as $i => $value) {
			$memberVars[$value] = NULL;
		}
	}

	//Just in case I want to implement constructor overloading in the future
	public static function create()
	{
		return new className();
	}

	/**
	 ***************
	 * copy
	 ***************
	 * 	Copy constructor
	 *	@param 	string 	$classname	- Name of class. Must be a child class of oldObject, or another instance of oldObject class
     *  @paramobject $oldObject     - The object being copied
	 * 	@return string	$result 	- Returns  
	 */
	public static function copy($className, $oldObject)
	{
		//check to see if class exists
		if(!class_exists($className))
			return false;
		//check to see if the class $className is actually a child class of the $oldObject
		//	or an instance of oldObject
		if( !is_subclass_of($className, get_class($oldObject) ) &&
			get_class($oldObject) !== $className )
			return false;
		$result = new $className;
		foreach (self::$allowedSetMethods as $i => $value) {
			$result->memberVars[$value] = $oldObject->memberVars[$value];
		}
		return $result;
	}

	public function __set($name, $value) 
	{
		if(in_array($name, self::$allowedSetValues))
		{
			$this->memberVars[$name] = $value;
			return true;
		}
		else
			return false;
	}

	public function __get($name) 
	{
		if
		(//if variable is actually set, and is allowed to be accessedw
			in_array($name, self::$allowedGetValues) &&
			in_array($name, $this->memberVars)
		)
		{
			$this->memberVars[$name] = $value;
			return true;
		}
		else
			return false;
	}
}