wordpress add multiple callback function to single ajax action from different plugin

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I was trying to add one more callback function to wordpress ajax action 

woocommerce_apply_coupon

this wp_ajax action is defined in woocommerce plugin,I want to add my own callback function on this action from my plugin file .

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what i have tried – 

add_action( 'wp_ajax_nopriv_woocommerce_apply_coupon','darn',999);
add_action( 'wp_ajax_woocommerce_apply_coupon', 'darn',999);

function darn(){
         print_r($_REQUEST);
         exit;
    }

Doing this in my functions.php is not even showing any error, like i cant see any effect of this code.

want to know if this is even possible to achieve . Thankyou.

Post Views: 3

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2 comments

  1. well i would like to answer my own question since nobody seems to answer it .

    add_action( 'wp_ajax_nopriv_woocommerce_apply_coupon','darn',1);
add_action( 'wp_ajax_woocommerce_apply_coupon', 'darn',1);

function darn(){
         print_r($_REQUEST);
         exit;
    }

    by setting priority to one (giving my callback function the top priority) it actually worked !

  2. This is untested, but I’d try to solve it removing the original actions after all plugins are loaded, and then adding your substitute:

    add_action( 'plugins_loaded', 'b5f_new_ajax_coupon', 15 );

function b5f_new_ajax_coupon() 
{
    remove_action( 'wp_ajax_woocommerce_apply_coupon', 'woocommerce_ajax_apply_coupon' );
    remove_action( 'wp_ajax_nopriv_woocommerce_apply_coupon', 'woocommerce_ajax_apply_coupon' );
    add_action( 'wp_ajax_woocommerce_apply_coupon', 'b5f_ajax_apply_coupon' );
    add_action( 'wp_ajax_nopriv_woocommerce_apply_coupon', 'b5f_ajax_apply_coupon' );
}   

function b5f_ajax_apply_coupon()
{
    // COPY THE ORIGINAL /woocommerce/woocommerce-ajax.php#L57
    // AND ADAPT TO YOUR NEEDS
}