How to get post total for each author for blogspot

Sometimes, you have a blog with several authors and you might need to keep tract on their total post. So, this is how I do it

I create a simple php file to do that.

$url = "http:///feeds/posts/default?alt=rss&redirect=false&max-results=10000"
$str = file_get_contents($url)

echo "NickName (".substr_count($str, (authorName)').");
echo "NickName2 (".substr_count($str, (authorName2)').");