Description:
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I copied PHP nts ZIP package into c:\php (also tested in c:\program files\php)
PHP installed in IIS as FastCGI according to 
http://learn.iis.net/page.aspx/247/using-fastcgi-to-host-php-applications-on-iis-60/

php.ini configured properly (attached on test script field)
extension_dir as well 
phpinfo() test works fine

after uncommented php_interbase, I expect that section interbase will appear in phpinfo. It didn't. No error messages during service starts.

php_interbase.dll is in place (in ext directory)

php_ini_loaded_file points to ini file I modified
comment / uncomment extension=php_mysql turns on/off mysql section

After replace all (except for php.ini) php file to version 5.2.17, section interbase appears in phpinfo(). I did not observe problems with 5.2.17 version)

GDS32 is in c:\windows\system32 folder (version 6.3.0.26074 - Firebird project 2.5.0.26074).

I tested all on two systems (on real and virtual computer)

Test script:
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magic_quotes_sybase = On
extension_dir="C:\PHP\ext"
short_open_tag = On

[Interbase]
extension=php_interbase.dll
ibase.allow_persistent = 1
ibase.max_persistent = -1
ibase.max_links = -1
ibase.default_db = null
ibase.default_user = null
ibase.default_password = null
ibase.default_charset = null
ibase.timestampformat = "%Y-%m-%d %H:%M:%S"
ibase.dateformat = "%Y-%m-%d"
ibase.timeformat = "%H:%M:%S"



Expected result:
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I expect section Interbase in phpinfo
Also I expect ibase_connect will works

Actual result:
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Interbase section does not appear