PHP 5.4.6 or 5.3.16 for production?

Christophe asked:

On, we can read : All users of PHP are encouraged to upgrade to PHP 5.4.6, or at least 5.3.16.
Does it mean that it is better to use 5.4.6 than 5.3.16, even for production ?
I have heard that 5.4.6 is not stable.

I would be interested in 5.4.6 in order to use, but will not if PHP 5.4.6 is not stable.

Thank you.

My answer:

For developing a new project from scratch, I would go with 5.4. It will have a much longer shelf life than 5.3 or prior versions.

For deploying an existing project, including any open source PHP code you downloaded from the Internet, I would use PHP 5.3. The reason for this is that 5.4 has a few places where backward compatibility was broken, and some existing PHP scripts will need updating to be compatible with 5.4. In a few cases, the package would have to be completely refactored to work with 5.4.

See the PHP 5.4 migration guide for all the gory details.

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