Description:
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On Windows, directives that have backslashes (\) in file paths are broken.
When something like \t is seen (like in error_log="c:\temp\err.log"), it's interpreted like a control sequence (in the example, a tab), and no error logs are generated. This behavior is present in many directives relative to file paths.
Solution (temporary?): use forward slashes instead (even in Windows).
The same is valid for PHP 6.
This is a PATH problem because, where error_log=syslog is used, the messages are correctly sent to Event Viewer.
Another clue: phpinfo() output "eats" \t.

Reproduce code:
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In PHP.INI:

error_log = "D:\Progs\php\temp\Logs\php5.3_error_log.txt"
include_path = ".;D:\Progs\php\include"
etc.


Expected result:
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No error logs are generated.