bbPress - Get an users post count

functions.php

<?php
/*
*
* Get Author Post Count
*
* @param: (int) user id
*
*/
function bbp_get_author_post_count($author_id = NULL) {

	if( $author_id !== NULL ) {
	
		$author_id = (int) mysql_real_escape_string($author_id);
		
		$query = mysql_query("
			SELECT count(ID) FROM wp_posts
			WHERE post_author = " . $author_id . "
			AND (
				post_type = 'topic' OR post_type = 'reply'
			)
			AND (
				post_status = 'publish' OR post_status = 'closed'
			)
			LIMIT 1;
		");
		
		$post_count = mysql_fetch_row($query);
		
		return $post_count[0];
	
	}
	
	return 0;

}

// Usage
global $current_user;
get_currentuserinfo();

echo 'Post Count: ' . bbp_get_author_post_count($current_user->ID);