WordPress at a glance
action is not described

is_wp_error_instance action-hook . WP 5.6.0

Fires when is_wp_error() is called and its parameter is an instance of WP_Error.

Usage

add_action( 'is_wp_error_instance', 'action_function_name_8518' );
function action_function_name_8518( $thing ){
	// action...
}
$thing(WP_Error)
The error object passed to is_wp_error().

Changelog

Since 5.6.0 Introduced.

Where the hook is called

is_wp_error()
is_wp_error_instance
wp-includes/load.php 1514
do_action( 'is_wp_error_instance', $thing );

Where in WP core the hook is used WordPress

Usage not found.