Seeking clarification on apparent contradictions regarding weakly typed languages

I think I understand strong typing , but every time I look for examples for what is weak typing I end up finding examples of programming languages that simply coerce/convert types automatically.

Does PHP have autovivification?

Searching PHP.net for autovivification gives no results. At the time of writing, Wikipedia claims that only Perl has it. There are no clearly definitive results when searching Google for "php autovivification".

How do you use scripting language (PHP, Python, etc) to improve your productivity?

I'm a Delphi developer on the Windows platform, recently read the PHP tutorial at W3CSchools, it looks interesting.