WordPress at a glance
action is not described

pre_get_search_form action-hook . WP 3.6.0

Fires before the search form is retrieved, at the start of get_search_form().

Usage

add_action( 'pre_get_search_form', 'action_function_name_5398' );
function action_function_name_5398( $args ){
	// action...
}
$args(array)
The array of arguments for building the search form.

Changelog

Since 3.6.0 Introduced.
Since 2.7.0 as 'get_search_form' action.
Since 5.5.0 The $args parameter was added.

Where the hook is called

get_search_form()
pre_get_search_form
wp-includes/general-template.php 251
do_action( 'pre_get_search_form', $args );

Where in WP core the hook is used WordPress

Usage not found.