how to use non static variable in static method php code example

Example: php access non static function

<?php
	class Toys
	{
		private $toys_name;
		public $toys_category;
		public static $shop_name;

		function Toys($name,$category) 
		{
			$this->toys_name = $name;
			$this->toys_category = $category;
		}

		public function getToyName() 
		{ 
			return $this->toys_name; 
		}

		public function getToyCategory() 
		{ 
			return $this->toys_category; 
		}	

		public function getToyShop_nonStatic() 
		{ 
			return self::getToyShop(); 
		}

		public static function getToyShop() 
		{ 
			return self::$shop_name;
		}

		public static function setToyShop($shopname) 
		{ 
			self::$shop_name=$shopname; 
		}

	}

	$objToys = new Toys("Battery Car","Battery Toys");
	$toys_name = $objToys->getToyName();
	$toys_category = $objToys->getToyCategory();
	echo "<br/>Toy: " . $toys_name . ", Category: " . $toys_category;

	Toys::$shop_name = "Disney";
	$shop_name = Toys::getToyShop();
	echo "<br/>Shop Name: " . $shop_name;

	Toys::setToyShop("ToyShop");
	$shopname = Toys::getToyShop_nonStatic();
	echo "<br/>Shop Name via non static function: " . $shopname;

?>