wordpress-plugin

I have this wordpress site with a plugin called JSON API. This plugin provides a JSON format for the content that is in the wordpress. I was able to enable CORS on the wordpress by adding header("Access-Control-Allow-Origin: *"); on the php header. But when I tried the url that the JSON API plugin provides the CORS does not work anymore. This is the wordpress site were I'm doing the tests... I used the test cors website to check if it was working and it is... http://kiwa-app.loading.net/ But when I try with the url that the JSON api provides me, is not working anymore. I'm still have the error

I'm curious how plugins work, I just know that instead of changing the code we use plugins, but how do they do their job without changing the code ? and what should a coder consider when coding a new project so it can have plugins ? and thank you very much :D There are multiple variations on how to implement a plugin system. Wordpress uses a quite common scheme often described as "hooks." I don't know the exact implementation but it basically works like this: // plugin.php script registers its own callback function register_plugin("hook_type", "plugin_function_123"); function plugin_function

I want to show a additional column in the backend of WooCommerce (in Orders overview). The column should contain a custom field, which i have defined (delivery date). How to do this? post_ahead In case someone still needs it - instructions on how to add new columns in Woocommerce orders list. No need in unsetting the default columns, just add this in your functions.php and your code will be valid for updates. 1. Define columns position and names add_filter( 'manage_edit-shop_order_columns', 'MY_COLUMNS_FUNCTION' ); function MY_COLUMNS_FUNCTION($columns){ $new_columns = (is_array($columns)) ?