Congratulations to the PHP community – the whole community – on the
release of PHP 7.0.0.
Thanks also to the Oracle staff who have worked on the internal
rewrite necessary to make the OCI8 and PDO_OCI extensions work with
PHP 7’s completely revamped Extension API.

The Oracle Database OCI8 and PDO_OCI extensions are included in the
PHP source distribution.
The feature sets are unchanged.

The equivalent standalone OCI8 package compatible with PHP 7 will
be released as version 2.1 on PECL soon. PDO_OCI will
remain solely part of the core PHP source distribution.

For those interested in performance, Zend have put some benchmark
figures here showing the significant improvements, which were a key
feature of this release.

Other features are listed in the release
announcement:

• Significantly reduced memory usage
• Abstract Syntax Tree
• Consistent 64-bit support
• Improved Exception hierarchy
• Many fatal errors converted to Exceptions
• Secure random number generator
• Removed old and unsupported SAPIs and extensions
• The null coalescing operator (??)
• Return and Scalar Type Declarations
• Anonymous Classes
• Zero cost asserts

See the migration documentation for all the fine details.

Source: Planet PHP