Using hooks with extra parameters

Question

I want to add my own function to an already existing hook. Here is the definition:

do_action( 'woocommerce_before_single_product_summary' );

The original function that uses it looks like so:

add_action( 
    'woocommerce_before_single_product_summary',
    'woocommerce_template_single_title', 
    5 
);

Since I don't want to touch the theme, nor Woocommerce templates, I want to add my own function but with lower priority and some 3 extra parameters like so:

add_action( 'woocommerce_before_single_product_summary', 'my_own_function', 6,  3);

• Is it possible?
  • If yes, where are these parameters defined?
• If not,
  • Is it possible to use global values instead?
  • Is there another solution to my problem?

Answer 1

Since

do_action( 'woocommerce_before_single_product_summary' );

doesn't have any additional input arguments like:

do_action( 'woocommerce_before_single_product_summary', $args1, $args2, $args3 );

then your action callback will always be called without any input arguments.

function my_own_function ()
{
    // ...
}

So you will have to get it by other means: e.g. through functions, classes or by tapping values from other hooks.

But you can surely change the priority:

add_action( 'woocommerce_before_single_product_summary', 'my_own_function', 5 );

If you can modify it, e.g. in your child theme, to:

do_action( 'woocommerce_before_single_product_summary', $args1, $args2, $args3 );

then you can use:

add_action( 'woocommerce_before_single_product_summary', 'my_own_function', 5, 3 );

with the callback as:

function my_own_function ( $args1, $args2, $args3 )
{
    // ... you have now access to $args1, $args2, $args3
}