Question

I register class methods for actions in my WordPress plugin. When my method gets called by WordPress, if I try to use the $this variable, php throws an error saying the call to $this variable is illegal outside the context of an object.

How can that be? I thought unless the method is static, you’re not supposed to be able to call class methods if the class isn’t instantiated! My method isn’t static! What is happening?

The source code

---

Obviously the initialize is called from the main plugin file:

add_action('init', array('AffiliateMarketting', 'initialize'), 1);

My class looks like this:

class AffiliateMarketting 
{
    public function __construct()
    {
        // some initialization code
    }

    public function initialize()
    {
        add_action('woocommerce_before_single_product', array("AffiliateMarketting", "handleAffiliateReferral"));
    }

    public function handleAffiliateReferral($post)
    {
        $this->xxx();  // <---- offending function call
    }

    public function xxx()
    {

    }
}

The received error message is in fact Fatal error: Using $this when not in object context in <filename> on line <linenumber>.

Answer 1

You have to instantiate the class first. Something like this:

$affiliatemarketing = new AffiliateMarketing;

and then do the following:

add_action('init', array(&$affiliatemarketing, 'initialize'), 1);

Edit: forgot to add, your action in your method should be added like this:

add_action('woocommerce_before_single_product', array(&$this, "handleAffiliateReferral"));