I am using Windows 7 and php5.6.
php_oci8_12c.dll exists but I could not find it. Other modules are normal.
errorlog:
PHP Warning: PHP Startup: Unable to load dynamic library 'C:/Server/bin/ext\php_oci8_12c.dll' - The specified module could not be found.\r\n in Unknown on line 0
A bit late, but I faced the issue and found a possible answer just now.
First, Oracle binaries (from instant client 12 x86) must be in the system path.
Second (the most vicious), check which VC++ runtime is needed (on Oracle's download page) for this instant client and install it.
I spent 6 hours on it and finally got it. Even on a Windows 2016 server, VC++ runtimes are not installed by default. It's a real pain to realize that.
Hope this helps
