Issue in Installing PHP7.2-Mcrypt

PHP 7.2 with mcrypt in Windows

Basically I think you have mentioned all possibilities and you do not have a choice. Do not downgrade to PHP 5.6 this approach has no future.

MCrypt was removed from PHP for one of the main reasons why you want to upgrade PHP: Security. The MCrypt library is not maintained anymore. Therefore installing the MCrypt extension is also a bad idea. But it can be a temporary solution (follow e.g. those instructions https://serverpilot.io/community/articles/how-to-install-the-php-mcrypt-extension.html).

The only good solution is migrating from mcrypt to something else. There are questions regarding this topic on Stackoverflow already (e.g. Upgrading my encryption library from Mcrypt to OpenSSL). Alternativly you could use some encryption library. Migrating a large amount of code/data might be a pain but this is the most future-oriented approach in this case.

How to install php-mcrypt in lando with php 7.2?

This is what you've missed:

services:
  appserver:
    build_as_root:
      - apt-get update -y
      - apt-get install libmcrypt-dev
      - pecl install mcrypt-1.0.1
      - docker-php-ext-enable mcrypt

You can use the following:

name: myapp
  recipe: drupal7
  config:
    webroot: web
    php: '7.2'
proxy:
  pma:
    - pma.myapp.lndo.site
services:
  pma:
    type: phpmyadmin
  appserver:
    build_as_root:
      - apt-get update -y
      - apt-get install libmcrypt-dev
      - pecl install mcrypt-1.0.1
      - docker-php-ext-enable mcrypt

php 7 Mcrypt PHP extension required

Had the same issue - PHP7 missing mcrypt.

This worked for me in Ubuntu Please try below commands.

sudo apt-get update
sudo apt-get install mcrypt php7.0-mcrypt
sudo apt-get upgrade

Then restarts apache

sudo service apache2 restart

Hope this commands helps!

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