Description:
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When upgrading from 5.0.5 to 5.1.6 I am unable to get php_oci8.dll to load correctly.

I am using all of the same parameters that I used in 5.0.5 and have even tried the same php,ini file but it fails to load.

I do NOT get an error saying that php_oci8.dll cannot be found and it is definately UN-commented in php.ini.

When I then attempt an oci_connect or oci_pconnect, I get an error saying 
"Fatal error: Call to undefined function oci_connect() in ........"

Examining phpinfo, no entry for oci8 exists however the location of php.ini is correct.

Both 5.0.5 and 5.1.6 are set up in the same way and oci.dll is in the same location therefore is cannot be Oracle Library errors.

I have tried both the php_oci8.dll that came with the distribution and from http://pecl4win.php.net/ext.php/php_oci8.dll (5.1.2) but both produced the same error.

Reproduce code:
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$ora_handler = oci_connect ("myusername", "mypassword", "mydatabase");

Actual result:
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No output was given apart from error "Fatal error: Call to undefined function oci_connect() in ........"