(hook_prefix)(key) │ filter-hook │ WC 1.0

Usage

add_filter( '(hook_prefix)(key)', 'wp_kama_hook_prefixkey_filter', 10, 2 );

/**
 * Function for `(hook_prefix)(key)` filter-hook.
 * 
 * @param  $value 
 * @param  $that  
 *
 * @return 
 */
function wp_kama_hook_prefixkey_filter( $value, $that ){

	// filter...
	return $value;
}

$value

-

$that

-

Where the hook is called

$value = apply_filters( $this->get_hook_prefix() . $key, $value, $this );

Where the hook is used in WooCommerce