The package was eventually found on Lerdorf's Web server, and users started asking for additional features. This resulted in a distribution called Personal Home Page Construction Kit. At the same time, Lerdorf was working on a similar tool to embed SQL queries into forms. It is now a complete scripting language with extended support for database connectivity. MySQL is very flexible in what it allows you to index.
Secondary indexes can have one or more fields.
At this time, it is not possible to index BLOB types, though there are plans to offer this in the future. For instance, if you want only the first 50 out of 220 characters in a field to be unique, you can specify that only the first 50 be made part of the index.