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I have Windows 7 64bit, IIS 7, and installed PHP on IIS. I enabled php_oci8.dll for Oracle connection, but I'm getting the following error:

PHP Warning: PHP Startup: Unable to load dynamic library 'C:\Program Files (x86)\PHP\v5.5\ext\php_oci8.dll' - The specified module could not be found. in Unknown on line 0

I have checked that the php_oci8.dll exist in: 'C:\Program Files (x86)\PHP\v5.5\ext\php_oci8.dll'

My php.ini below:

extension_dir="C:\Program Files (x86)\PHP\v5.5\ext\" [PHP_OCI8] extension=php_oci8.dll

I downloaded Oracle Instant Client 32 bit at http://www.oracle.com/technetwork/topics/winsoft-085727.html. Then I extract the it and set the directory in Environment Variable "Path".

However I'm still getting the same error.

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    [PHP_OCI8] is not a valid .ini file section. There is a [OCI8] section, but you don't need to put the extension line there. What version of PHP are you using (5.3, 5.4, 5.5)? Is it 32- or 64-bit? what version of the IntantClient are you using? Commented Sep 16, 2014 at 10:20
  • [OCI8] is automatically inserted by PHP Manager in IIS. I'm using PHP 5.5 64 bit, Instant Client version 10 32 bit. I have solve it by installing a higher Instant Client version 11. Thank for your reply anyway. Commented Sep 16, 2014 at 11:01

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I have found the fix, I should install instantclient-basic-nt-11.2.0.3.0.zip 32bit. Earlier I installed the Oracle Client version 10. I tried to install the version 10 first because it worked when I install it in PHP 5.5/ IIS 8 / Windows 2012 Server. So it's weird why the IIS 8 in PHP 5.5 accepts Instant Client 10, while IIS 7 in PHP 5.5 doesn't accept Instant Client 10, but needs Oracle Instant Client 11. So the lesson is to try different Oracle Instant Client versions. Thanks.

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