Fix a bug when using [] on a string

Fix

Fix

- Nuke undefined_variable_string
- Introduce IS_UNSET

- Generalize the fast cache mechanism
- Add the HashTable struct to the fast cache mechanism

Introduce a zval-specific cache - 5-15% speed improvement

Change ALLOC_ZVAL() semantics

- Create two new macro's. ALLOC_ZVAL() and FREE_ZVAL(z) and make Zend use
them.

- require() of a dynamic expression now has the standard require() semantics
- Fixed a memory leak in require() of a dynamic expression

- Fix a very old legacy memory leak in break(n) statements

Fix for the array() initialization bug Stas found

Fix the highlighting problem. STR_REALLOC() should be used instead of plain erealloc()
whenever you're dealing with strings that might be coming back from the engine - there seem
to be a few

Fix the highlighting problem. STR_REALLOC() should be used instead of plain erealloc()
whenever you're dealing with strings that might be coming back from the engine - there seem
to be a few other places like this in PHP.

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We're using ZVAL's now.

- Fix Sascha's leak. Good report!

- Fix the crash Thies was experiencing (returning a function call could cause a crash)
- Fix the leak Thies was experiencing (@fcall() leaked)

- Made things work again (Thies, everybody - please check the latest CVS and see if you're
still getting any problems)
- Changed the interface of call_user_function_ex() to support returnin

- Made things work again (Thies, everybody - please check the latest CVS and see if you're
still getting any problems)
- Changed the interface of call_user_function_ex() to support returning of references

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- More fixes related to the return references patch
- eval_string() and call_user_function_ex() still don't work.
- The libzend tree is untested and might not be stabl yet.

- Implement return by reference:
- In function declaration instead of the return statement
- In the assignment phase
- Implement ability to turn off support for call-time pass by refe

- Implement return by reference:
- In function declaration instead of the return statement
- In the assignment phase
- Implement ability to turn off support for call-time pass by reference

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Fix warnings surfacing in maintainer-mode.

- Forgot to check for BP_VAR_IS in the fix made for Thies' string offset
problem.

- Add use support (behaves like require, but will not use the same file twice)
- Add import support (behaves like include, but requires parentheses; will not
use the same file twice; Curre

- Add use support (behaves like require, but will not use the same file twice)
- Add import support (behaves like include, but requires parentheses; will not
use the same file twice; Currently, it is not yet properly implemented, and
only behaves like include)

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- Fix problem Thies reported. We by mistake separated variables which were
being fetched for read only.

That's a more thorough fix...

Fix bug #2817 - assignments to string offsets could erronously modify unrelated strings

That slipped away