WordPress at a glance
filter is not described

xmlrpc_prepare_comment filter-hook . WP 3.4.0

Filters XML-RPC-prepared data for the given comment.

Usage

add_filter( 'xmlrpc_prepare_comment', 'filter_function_name_761', 10, 2 );
function filter_function_name_761( $_comment, $comment ){
	// filter...

	return $_comment;
}
$_comment(array)
An array of prepared comment data.
$comment(WP_Comment)
Comment object.

Where the hook is called

wp_xmlrpc_server::_prepare_comment()
wp-includes/class-wp-xmlrpc-server.php 1155
return apply_filters( 'xmlrpc_prepare_comment', $_comment, $comment );

Where the hook is used (in WP core)

Does not used.