Using class observers

**SpaceMonkey** · 29 Jun 2018, 04:14 AM

Hi,

I am rebuilding my old site from zen v1.54 to 1.5.5f. My php is v5.6.32 (unchanged from v1.54).

I used to use the "real world example" in the wiki here. I have simply copied the files from my old installation to the new. Unfortunately that didn't work!

Now, when I add anything to the cart I get a blank page, if I restore the session the item wasn't added and no free gift!

Here is what I have had working well in v1.54

File 1 - catalogue/includes/auto_loaders/config.freeProduct.php

Code:

<?php
/**
 * Observer class used to add a free product to the cart if the user spends more than $x
 *
 */
$autoLoadConfig[10][] = array('autoType'=>'class',
                              'loadFile'=>'observers/class.freeProduct.php');
$autoLoadConfig[90][] = array('autoType'=>'classInstantiate',
                              'className'=>'freeProduct',
                              'objectName'=>'freeProduct');
?>

File 2 - catalogue/includes/classes/observers/class.freeProduct.php

Code:

<?php 
/** 
 * Observer class used to add a free product to the cart if the user spends more than $x 
 * 
 */ 
class freeProduct extends base { 
  /** 
   * The threshold amount the customer needs to spend. 
   *  
   * Note this is defined in the shops base currency, and so works with multi currency shops 
   * 
   * @var decimal 
   */ 
  var $freeAmount = 15.01; 
  /** 
   * The id of the free product. 
   *  
   * Note. This must be a true free product. e.g. price = 0 Also make sure that if you don't want the customer 
   * to be charged shipping on this, that you have it set correctly. 
   * 
   * @var integer 
   */ 
  var $freeProductID = 239; 
  /** 
   * constructor method 
   *  
   * Attaches our class to the $_SESSION['cart'] class and watches for 2 notifier events. 
   */ 
  function freeProduct() { 
    $_SESSION['cart']->attach($this, array('NOTIFIER_CART_ADD_CART_END')); 
    $_SESSION['cart']->attach($this, array('NOTIFIER_CART_REMOVE_END')); 
  } 
  /** 
   * Update Method 
   *  
   * Called by observed class when any of our notifiable events occur 
   * 
   * @param object $class 
   * @param string $eventID 
   */ 
    
function update(&$class, $eventID, $paramsArray) { 
if ($_SESSION['cart']->show_total() >= $this->freeAmount && !$_SESSION['cart']->in_cart($this->freeProductID) )    
    { 
      $_SESSION['cart']->add_cart($this->freeProductID); 
      $_SESSION['freeProductInCart'] = TRUE;   
    } 
  if ($_SESSION['cart']->show_total() < $this->freeAmount && $_SESSION['cart']->in_cart($this->freeProductID) )  
  { 
    $_SESSION['cart']->remove($this->freeProductID); 
  } 
  if ($_SESSION['cart']->in_cart($this->freeProductID))  
  { 
    $_SESSION['cart']->contents[$this->freeProductID]['qty'] = 1; 
  } 
  } 
 } 
?>

What has changed in zen 1.55f? Anyone any clues what I have missed?

Error log:

Code:

	[29-Jun-2018 04:01:51 Europe/London] Request URI: /dev/final/index.php?main_page=index&cPath=5&sort=20a&action=buy_now&products_id=18&zenid=cc7772d2edee84f77ab054932ac38a63, IP address: 84.84.84.84
#1  session_start() called at [/home/#######/public_html/dev/final/includes/functions/sessions.php:107]
#2  zen_session_start() called at [/home/#######/public_html/dev/final/includes/init_includes/init_sessions.php:86]
#3  require(/home/#######/public_html/dev/final/includes/init_includes/init_sessions.php) called at [/home/#######/public_html/dev/final/includes/autoload_func.php:48]
#4  require(/home/#######/public_html/dev/final/includes/autoload_func.php) called at [/home/#######/public_html/dev/final/includes/application_top.php:170]
#5  require(/home/#######/public_html/dev/final/includes/application_top.php) called at [/home/#######/public_html/dev/final/index.php:26]

[29-Jun-2018 04:01:51 Europe/London] PHP Warning:  session_start(): Cannot send session cookie - headers already sent by (output started at /home/#######/public_html/dev/final/includes/auto_loaders/config.freeProduct.php:11) in /home/#######/public_html/dev/final/includes/functions/sessions.php on line 107
[29-Jun-2018 04:01:51 Europe/London] Request URI: /dev/final/index.php?main_page=index&cPath=5&sort=20a&action=buy_now&products_id=18&zenid=cc7772d2edee84f77ab054932ac38a63, IP address: 84.84.84.84
#1  session_start() called at [/home/#######/public_html/dev/final/includes/functions/sessions.php:107]
#2  zen_session_start() called at [/home/#######/public_html/dev/final/includes/init_includes/init_sessions.php:86]
#3  require(/home/#######/public_html/dev/final/includes/init_includes/init_sessions.php) called at [/home/#######/public_html/dev/final/includes/autoload_func.php:48]
#4  require(/home/#######/public_html/dev/final/includes/autoload_func.php) called at [/home/#######/public_html/dev/final/includes/application_top.php:170]
#5  require(/home/#######/public_html/dev/final/includes/application_top.php) called at [/home/#######/public_html/dev/final/index.php:26]

[29-Jun-2018 04:01:51 Europe/London] PHP Warning:  session_start(): Cannot send session cache limiter - headers already sent (output started at /home/#######/public_html/dev/final/includes/auto_loaders/config.freeProduct.php:11) in /home/#######/public_html/dev/final/includes/functions/sessions.php on line 107
[29-Jun-2018 04:01:51 Europe/London] Request URI: /dev/final/index.php?main_page=index&cPath=5&sort=20a&action=buy_now&products_id=18&zenid=cc7772d2edee84f77ab054932ac38a63, IP address: 84.84.84.84
#1  header() called at [/home/#######/public_html/dev/final/includes/init_includes/init_templates.php:78]
#2  require(/home/#######/public_html/dev/final/includes/init_includes/init_templates.php) called at [/home/#######/public_html/dev/final/includes/autoload_func.php:48]
#3  require(/home/#######/public_html/dev/final/includes/autoload_func.php) called at [/home/#######/public_html/dev/final/includes/application_top.php:170]
#4  require(/home/#######/public_html/dev/final/includes/application_top.php) called at [/home/#######/public_html/dev/final/index.php:26]

[29-Jun-2018 04:01:51 Europe/London] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home/#######/public_html/dev/final/includes/auto_loaders/config.freeProduct.php:11) in /home/#######/public_html/dev/final/includes/init_includes/init_templates.php on line 78
[29-Jun-2018 04:01:51 Europe/London] Request URI: /dev/final/index.php?main_page=index&cPath=5&sort=20a&action=buy_now&products_id=18&zenid=cc7772d2edee84f77ab054932ac38a63, IP address: 84.84.84.84
#1  header() called at [/home/#######/public_html/dev/final/includes/functions/functions_general.php:46]
#2  zen_redirect() called at [/home/#######/public_html/dev/final/includes/classes/shopping_cart.php:2030]
#3  shoppingCart->actionBuyNow() called at [/home/#######/public_html/dev/final/includes/main_cart_actions.php:49]
#4  require(/home/#######/public_html/dev/final/includes/main_cart_actions.php) called at [/home/#######/public_html/dev/final/includes/init_includes/init_cart_handler.php:44]
#5  require(/home/#######/public_html/dev/final/includes/init_includes/init_cart_handler.php) called at [/home/#######/public_html/dev/final/includes/autoload_func.php:48]
#6  require(/home/#######/public_html/dev/final/includes/autoload_func.php) called at [/home/#######/public_html/dev/final/includes/application_top.php:170]
#7  require(/home/#######/public_html/dev/final/includes/application_top.php) called at [/home/#######/public_html/dev/final/index.php:26]

[29-Jun-2018 04:01:51 Europe/London] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home/#######/public_html/dev/final/includes/auto_loaders/config.freeProduct.php:11) in /home/#######/public_html/dev/final/includes/functions/functions_general.php on line 46

Honestly, any suggestions appreciated.

Oh yeah, if I remove the two files config.freeProduct.php & class.freeProduct.php the errors stops immediately!