php7 - How to install PHP 7?

PHP 7 came out yesterday and I would like to give it a try.

PHP 7.0.0 comes with a new version of the Zend Engine, numerous improvements and new features such as

• Improved performance: PHP 7 is up to twice as fast as PHP 5.6


• 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

php.net

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Is that possible to install it on current Ubuntu version?

Is there any current limitations or known compatibility issues?

You can do the following:

sudo apt-get install python-software-properties software-properties-common
sudo LC_ALL=C.UTF-8 add-apt-repository ppa:ondrej/php
sudo apt-get update

Optionally purge PHP 5:

sudo apt-get remove php5-common -y

Or directly purge it including configuration files:

sudo apt-get purge php5-common -y

And finally install PHP 7:

sudo apt-get install php7.0 php7.0-fpm php7.0-mysql -y

Optionally clean up unneeded packages afterwards:

sudo apt-get --purge autoremove -y

Alternatively, you can install PHP 7.0 from sources using this script script or following instruction on this blog.

EDIT:

PHP5 has now been replaced with PHP7 as the default PHP in Ubuntu 16.4 so, to install PHP7 on Ubuntu 16.04:

sudo apt-get install php7.0 

Or

sudo apt-get install php