PHP and undefined variables strategy

Log your E_NOTICE messages to a text file. You can then process logs with automated scripts to indicate files and lines where these are raised.

This is a common complaint with PHP. Here are some ideas:

1. Use a code analysis tool. Many IDEs such as NetBeans will help also.

2. Just run the code. PHP doesn't have an expensive compilation step like C++ does.

3. Use unit testing. Common side effects include: better code.

4. Set error_reporting(-1), or the equivalent in your ini file.

5. Get xdebug. It's not preventative, but stack traces help with squishing bugs.

6. isset(), === null (identity operator), and guard clauses are your friends.

Loose and dynamic typing are a feature of the language. Just because PHP isn't strict about typing doesn't mean you can't be. If it really bugs you and you have a choice, you could try Python instead—it's a bit stricter with typing.