[Plugin: WordPress Simple Paypal Shopping Cart] Breaks other plugins with sessions – I have the fix

WordPress Simple Paypal Shopping Cart has a bug that breaks other plugins with PHP $_SESSION

Problem confirmed with “Fast and Secure Contact Form” (where I am the author of)
http://wordpress.org/extend/plugins/si-contact-form/

I have the fix:
edit wp_shopping_cart.php
remove:
session_start();

Find:

function widget_wp_paypal_shopping_cart_init()
{

Replace with:

function widget_wp_paypal_shopping_cart_init()
{
  if( !isset( $_SESSION ) ) { // play nice with other plugins
    session_start();
  }

Now it will play nice with other plugins with sessions.
Any plugin that uses sessions should always check if a session was already started before starting one.

Mike

http://wordpress.org/extend/plugins/wordpress-simple-paypal-shopping-cart/