php as stored procedures

I was reading
http://www.linuxworld.com.au/article.php3?aid=123&tid=8
and specifically
"Later in 2001 this flexibility may extend even within the MySQL
database server, with PHP scripts used as stored procedures within MySQL
database"
I won't hold my breath for that to happen in 2001 knowing MYsql's many
promised future features but it got me wondering

Since there is pl/perl is it all remotely possible that a pl/php could
be implemented ?