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