Force Variable Declaration before use

is there such thing in PHP

[AthlonInside]

If you code in C or VB or PERL or other language, you are required (at least you can choose to) to DECLARE the any variable before you can use it. This will help the compiler to detect more possible mistakes and I found it useful.

Can I force PHP to do this as well?

[jatar_k]

error_reporting(E_ALL) [php.net]