WordPress at a glance
filter is not described

site_icon_attachment_metadata filter-hook . WP 4.3.0

Filters the site icon attachment metadata.

Usage

add_filter( 'site_icon_attachment_metadata', 'filter_function_name_9187' );
function filter_function_name_9187( $metadata ){
	// filter...

	return $metadata;
}
$metadata(array)
Attachment metadata.

Where the hook is called

WP_Site_Icon::insert_attachment()
wp-admin/includes/class-wp-site-icon.php 127
$metadata = apply_filters( 'site_icon_attachment_metadata', $metadata );

Where the hook is used (in WP core)

Does not used.