<?php
/* this statistics function is based on Statistics Plugin For WordPress [http://www.lesterchan.net/] */
function get_totalposts() {
	global $wpdb;
	$totalposts = $wpdb->get_var("SELECT COUNT(ID) FROM $wpdb->posts WHERE post_status = 'publish'");
	echo $totalposts;
}
function get_totalcomments() {
	global $wpdb;
	$totalcomments = $wpdb->get_var("SELECT COUNT(comment_ID) FROM $wpdb->comments WHERE comment_approved = '1'");
	echo $totalcomments;
}
?>
<?php
/* this number of posts function can be found at http://wordpress.org/support/topic/12805 */
function number_postpercat ($idcat, $post_status='publish') {
global $wpdb;
$result=$wpdb->get_col("SELECT c.post_id FROM {$wpdb->post2cat} c INNER JOIN {$wpdb->posts} p ON c.post_id = p.id WHERE c.category_id = $idcat AND p.post_status='$post_status'");
$number=count($result);
echo $number;
}
?>