PHP5.6 is installed by default in the VestaCP control panel.

To upgrade to 7.0 on CentOS 7, you need to add the correct REMI repository and enable remi update, remi release and remi-php70 repository.

rpm -Uvh remi-release-7.rpm epel-release-latest-7.noarch.rpm  

yum --enablerepo=remi update remi-release  
yum --enablerepo=remi-php70  

Now you need to stop apache2 and remove the existing PHP package

service httpd stop  
yum -y remove php  

Install PHP 7.0

yum install php70-php  
yum install php70-php-pear php70-php-bcmath php70-php-pecl-jsond-devel php70-php-mysqlnd php70-php-gd php70-php-common php70-php-fpm php70-php-intl php70-php-cli php70-php php70-phpphp-xml php70-php-opcache php70-php-pecl-apcu php70-php-pecl-jsond php70-php-pdo php70-php-gmp php70-php-process php70-php-pecl-imagick php70-php-devel php70-php-mbstring  

After this step, you need to stop the old PHP-FPM service and start the new one.

service php-fpm stop  
service php70-php-fpm start  
service httpd restart  

Create a symbolic link to the new PHP

ln -s /usr/bin/php70 /usr/bin/php  

You can check the version and main parameters of PHP by using the command:

# php -v

Important. Updating the PHP version may affect existing projects and they may not work correctly.

Updated Aug. 16, 2018