Yeah, it may come suddenly, but it's time to say good bye to curly braces used as string indexing operator.

PHP-5.1 will issue an E_STRICT error, and PHP-6 will probably don't know this syntax any more.

I don't know why, but I've got some strange sentimental feelings, maybe because I've never used those other brackets for string indexing...

The method he's talking about here is the $string{0} format, and it's making way for a unified string/array operator. It won't break things badly, though - in PHP 5.1 it'll just toss out a non-fatal error to let you know. But watch out, by PHP6, this functionality will be gone...