Description:
------------
If you modify an element of $_REQUEST, then call eval() with some syntax error, and then include() or require() another file, the changes in $_REQUEST are reset to the original values of $_REQUEST at script's startup time. The changes in $_REQUEST are permanently lost and the include()'d file as well as the main PHP file then operate with the reset $_REQUEST values.

Reproduce code:
---------------
* Proof of concept:

PHP 5.2.5 (bug):
http://famzah.net/evalbug/index.php?test=abcdef

PHP 4.4.8 (no bug):
http://famzah.net/evalbug/index.php4?test=abcdef

* Source code:

PHP 5.2.5 (bug):
http://famzah.net/evalbug/index.txt

PHP 4.4.8 (no bug):
http://famzah.net/evalbug/index4.txt


Expected result:
----------------
The expected behavior is that after the modification of an element in $_REQUEST, all included files as well as the main PHP file must operate with the modified values of $_REQUEST, because this is a super-global variable.

The above is currently true for all cases except when an eval() call is made which contains a syntax error. For example:
eval('this is a syntax error');

I reproduced the bug using the following PHP versions:
PHP 5.2.5 (cli), Zend Engine v2.2.0
PHP 5.2.5-3 with Suhosin-Patch 0.9.6.2 (cli), Zend Engine v2.2.0

The following PHP4 version does NOT have the bug:
PHP 4.4.8 (cli), Zend Engine v1.3.0

Actual result:
--------------
The bug situation is as follows:
- We call "index.php" with a GET parameter ?test=abcdef
- The script does and outputs the following:
index.php: $_REQUEST value is: abcdef
index.php: Modifying $_REQUEST by setting key 'test' to 'zzz'
index.php: $_REQUEST value is: zzz
index.php: Calling eval() with no syntax error.
index.php: Including the 'dump.php' file...
dump.php: $_REQUEST value is: zzz
index.php: $_REQUEST value is: zzz
index.php: Calling eval() with a syntax error.
index.php: $_REQUEST value is: zzz
index.php: Including the 'dump.php' file...
dump.php: $_REQUEST value is: abcdef
index.php: $_REQUEST value is: abcdef

The last two lines must contain the value 'zzz', not 'abcdef'.