WordPress at a glance
filter is not described

wp_generate_tag_cloud_data filter-hook . WP 4.3.0

Filters the data used to generate the tag cloud.

Usage

add_filter( 'wp_generate_tag_cloud_data', 'filter_function_name_1456' );
function filter_function_name_1456( $tags_data ){
	// filter...

	return $tags_data;
}
$tags_data(array)
An array of term data for term used to generate the tag cloud.

Where the hook is called

wp_generate_tag_cloud()
wp-includes/category-template.php 921
$tags_data = apply_filters( 'wp_generate_tag_cloud_data', $tags_data );

Where the hook is used (in WP core)

Does not used.