/usr/share/php5/common/opcache.ini is in php5-common 5.6.33+dfsg-0+deb8u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | ; configuration for php ZendOpcache module
; priority=05
zend_extension=opcache.so
|