Upgrade to PHP7.2

1. apt-get install apt-transport-https lsb-release ca-certificates

2. wget -O /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg

3. sh -c 'echo "deb https://packages.sury.org/php/ $(lsb_release -sc) main" > /etc/apt/sources.list.d/php.list'

4. apt-get update

5. apt-get install php7.2-common libapache2-mod-php7.2 php7.2-cgi php7.2-cli php7.2-phpdbg php7.2-fpm libphp7.2-embed php7.2-dev php7.2-curl php7.2-gd php7.2-imap php7.2-interbase php7.2-intl php7.2-ldap php7.2-readline php7.2-odbc php7.2-pgsql php7.2-pspell php7.2-recode php7.2-tidy php7.2-xmlrpc php7.2 php7.2-json php-all-dev php7.2-sybase php7.2-sqlite3 php7.2-mysql php7.2-opcache php7.2-bz2 libapache2-mod-php7.2 php7.2-mbstring php7.2-pdo php7.2-dom php7.2-enchant php7.2-gmp php7.2-soap php7.2-zip

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In case you need mcrypt:

1. apt-get -y install gcc make autoconf libc-dev pkg-config

2. apt-get -y install libmcrypt-dev

3. apt-get install php7.2-dev

4. pecl install mcrypt-1.0.1

   When you see the prompt “libmcrypt prefix? [autodetect] :” -> Press [Enter] to autodetect

5. php -i | grep "mcrypt"

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1. a2dismod php7.0

   *or whatever version you are upgrading from)

2. a2enmod php7.2