Here are instructions to install and run mcrypt on Debian 10 with PHP 7.3+
Check PHP Version
$ php -version PHP 7.3.9-1~deb10u1 (cli) (built: Sep 18 2019 10:33:23) ( NTS )
Check if mcrypt is installed
$ php -m | grep mcrypt
Install pre-requisites
sudo apt-get install php-dev libmcrypt-dev php-pear
Install mcrypt PHP module
$ sudo pecl channel-update pecl.php.net Updating channel "pecl.php.net" Update of Channel "pecl.php.net" succeeded $ sudo pecl install channel://pecl.php.net/mcrypt-1.0.2 ... ... Build process completed successfully Installing '/usr/lib/php/20180731/mcrypt.so' install ok: channel://pecl.php.net/mcrypt-1.0.2 configuration option "php_ini" is not set to php.ini location You should add "extension=mcrypt.so" to php.ini
Add mcrypt.so to the php.ini file
Open the /etc/php/7.3/cli/php.ini file and insert the following at the appropriate place where other extensions are added:
extension=mcrypt.so
All done. When successful, checking for the presence of the mcrypt PHP module should produce the following output:
$ php -m | grep mcrypt mcrypt
Developer Diary 
This rocked my world so hard thanks a lot
So I got a question. Im trying to make a owncloud raspberry pi server
Im new to this so im not quite sure where you want to put the extension, is it under dynamic extensions or where?
Also im guessing the semi colon before every extension there shouldnt be repeated for mcrypt?
The semi-colon that you may have guessed is to comment out the extensions. So even if you have two and they are both commented, shouldn’t matter. Just need to ensure that one of them is available. I hope that helped.