How to call functions from another class.

5 Responses

1. Eric Author January 22, 2009 at 6:47 pm

   Thank you for this tutorial. My question is, how do you call a function from another class if the classes are both instantiated from outside the classes (out at index.php, for example)?

   For example, I have my class “website”, which executes session_start() among other things. My website class also houses encryption methods.

   In my “pages” class, which I instantiate to create a page, it needs access to these encryption methods.

   So these are instantiated from index.php, and I can’t instantiate website class twice, since it runs code that should only be executed once per page load.

   I could pass my “website” object path when instantiating “pages”, but the code:

   class page
   {
   public $website
   function __construct($website)
   {
   $this->website->encrypt();
   }
   }

   Fails to work. How would one get around this?

2. Eric Author January 22, 2009 at 6:53 pm

   You know what? I don’t need to use $this when referencing variables passed into the methods in classes. I think by removing “this->”, the code example will work. I answered my own question 😀

   Thanks again!

3. Stefan Mischook Author January 22, 2009 at 7:14 pm

   Glad I could help!!

   😉

   Stefan

4. Rob Author July 16, 2009 at 8:39 am

   I have a possibly similar question about already instantiated classes. Based on what I have seen on other sites I have something like this:

   —class.login.php
   class login
   {
   var $loginID; var $role; ….
   function getCurrentLogin() {$this->loginID=…. }

   function displayUserOptions() {echo “Welcome “.this->name …}
   }

   —class.navigation.php
   class navigation
   {
   var currentPage; var menuStructure; ….

   function displayNavigation($currentLogin)
   {
   code to display menus;
   $currentLogin->displayUserOptions();
   }

   —-index.php
   include(class.login.php);
   include(class.navigation.php);
   if(!isset($_SESSION[“$currentLogin”])){
   $_SESSION[“$currentLogin”] = new login;}
   $_SESSION[“$currentLogin”]->checkOrGetCurrentLogin();

   if(!isset($_SESSION[“$navigation”])){
   $_SESSION[“$navigation”] = new navigation;}
   $_SESSION[“$navigation”]->displayNavigation($_SESSION[“$currentLogin”])

   The navigation bar displays fine then I get Call to undefined method login::displayUserOptions()

5. Stefan Mischook Author July 16, 2009 at 9:32 pm

   Hi,

   Can you repost your question on the PHP forum:

   http://www.killersites.com/forums/forum/12/php/

   Thanks,

   Stefan