I’ve released PHP 7
OCI8 2.1 on PECL and simultaneously made a patch release OCI8
2.0.10 which is compatible with PHP 5.2 – PHP 5.6.

To install OCI8 for PHP 7 use:

pecl install oci8

This installs OCI8 2.1 which, as I’m sure you can guess, had a lot
of internal changes to make it compatible with the vastly changed
internals of PHP 7.

If you want to install OCI8 for PHP 5.2, 5.3, 5.4, or 5.6 use:

pecl install oci8-2.0.10

Functionality in 2.0.10 and 2.1.0 is equivalent. They both contain
the fix for bug 68298, an overflow when binding 64bit numbers.

At time of writing, Windows DLLs were not yet built on PECL. If
you need them, you can grab them from the full PHP Windows bundle.

Source: Planet PHP