[PHP] How to install PHP 7 in Ubuntu 14.04


        
            
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            Observation

PHP 7 was released on December 3, 2015
PHP 7 is not available in the Ubuntu 12.04 (Precise) official repositories
PHP 7.0 is available for Trust.

Prerequisites
sudo apt-get install  build-essential autoconf libxml2-dev libicu-dev libssl-dev libsslcommon2-dev \
  libcurl4-openssl-dev pkg-config  libmcrypt-dev libreadline-dev unar p7zip-full libbz2-dev \
  libjpeg-dev libpng-dev libxpm-dev libfreetype6-dev libgmp-dev libfreetype6-dev libgmp-dev libmcrypt-dev \
  libpspell-dev libzip-dev php5-intl
Instalation / Configuration
sudo add-apt-repository ppa:ondrej/php
sudo apt-get update
sudo apt-get install -y php7.0 php7.0-fpm php7.0-mysql
sudo apt-get install -y php7.1 php7.1-fpm php7.1-mysql
sudo apt-get install -y php7.2 php7.2-fpm php7.2-mysql
sudo apt-get install -y php7.3 php7.3-fpm php7.3-mysql
sudo apt-get install -y php7.0-mcrypt php7.1-mcrypt
sudo apt-get install -y php7.0-mbstring php7.1-mbstring php7.2-mbstring php7.3-mbstring
sudo apt-get install -y php7.0-xml php7.1-xml php7.2-xml php7.3-xml
sudo apt-get install -y php7.0-curl php7.1-curl php7.2-curl php7.3-curl
sudo apt-get install -y php7.0-json php7.1-json php7.2-json php7.3-json
NOTE: You can use the following command to list available PHP 7.1 packages:
sudo apt-cache search php7-*

Testing
We can check and set the version of the php interpreter that is used by the command line.
sudo update-alternatives --list php
We can then set the default command line interpreter using update-alternatives.
sudo update-alternatives --set php /usr/bin/php7.3

Running
We can also run a script on a specific version of the php runtime by specifying the interpreter on the command line /path/to/desired/php/interpreter /path/to/your/script.
/usr/bin/php5 /home/andy/myscript.php

Modules
You will need to disabled the Apache PHP5 module and enabled the PHP7.0 module.
sudo a2dismod php5
sudo a2enmod php7.3
sudo service apache2 restart

PHP Version
php -v