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Methods in class can be accessed in two ways: dinamically or statically. Dinamically, it mean instantiating an object. We have done in past tutorial. Statically, by treating the class as a namespace. Look following code:

  <?
  class vehicle
  {
   	var $type;
   	
   	function vehicle( $type )
   	{
     		$this->type = $type;
   	}
 
    function oil_change ( $miles )
    {
      return ($miles / 15000);
    }
 
  }
 
 
  echo vehicle::oil_change (45000);
 
  ?>

We use :: operator. Namespace can avoid naming conflicts in your library.