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phpwordpresswoocommercehook-woocommercehook-wordpress

When exactly woocommerce/wordpress hooks are called?

I know there are hundreds of action hooks available in Wordpress and in Woocommerce plugin, but what is most confusing to me is: when exactly they are invoked?

For some of the hooks there are some information available in the internet, but for many of them I do not see any information available.

For example when I was checking the code of some custom plugin, I see following hooks :

add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_scripts' ) );
add_action( 'woocommerce_settings_api_form_fields_cod', array( $this, 'extend_cod' ) );
add_action( 'woocommerce_settings_api_sanitized_fields_cod', array( $this, 'clean_up_settings' ) );
add_action( 'woocommerce_delete_shipping_zone', array( $this, 'clean_up_gateway' ) );

My questions are where I can get the list of all the hooks for Woocommerce/Wordpress ? In the above example whether hooks starting with 'woocommerce_' are part of standard hooks or they are custom hooks specific to plugin ? Is it possible to create custom hooks ?

Solution

  • There are 2 kinds of hooks: Action hooks and filter hooks.

    Hooks are added/created via do_action() or apply_filters() functions.

    Hooks are triggered when the code where that do_action() or apply_filters() are located run.

    You can attach a callback function to an existing hook using add_action() or add_filter().

    Note: There is also a lot of undocumented hooks like most of various composite hooks.

    Related: