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Install PHP 7.2 / PHP 7.3 MCrypt extension (see )
## How to install mcrypt in php7.2 / php7.3
## Linux / MacOS / OSX
# Check version php and pecl
php -v # if default php is not 7.2 then use /usr/bin/php7.2 instead php
pecl version
sudo apt-get install php-pear
sudo apt-get install php7.2-dev
# Install mcrypt extension
# see
sudo apt-get -y install gcc make autoconf libc-dev pkg-config
sudo apt-get -y install libmcrypt-dev
sudo pecl install mcrypt-1.0.1
# When you are shown the prompt
# libmcrypt prefix? [autodetect] :
# Press Enter to autodetect.
# After success installing mcrypt trought pecl, you should add extension to php.ini,
# The output will look like this:
# ...
# Build process completed successfully
# Installing '/usr/lib/php/20170718/' ----> this is our path to mcrypt extension lib
# install ok: channel://
# configuration option "php_ini" is not set to php.ini location
# You should add "" to php.ini
# Grab installing path and add to cli and apache2 php.ini
# example:
sudo bash -c "echo extension=/usr/lib/php/20170718/ > /etc/php/7.2/cli/conf.d/mcrypt.ini"
sudo bash -c "echo extension=/usr/lib/php/20170718/ > /etc/php/7.2/apache2/conf.d/mcrypt.ini"
# check that the extension was installed with this command:
php -i | grep mcrypt
# The output will look like this:
# /etc/php/7.2/cli/conf.d/mcrypt.ini
# Registered Stream Filters => zlib.*, string.rot13, string.toupper, string.tolower, string.strip_tags, convert.*, consumed, dechunk, convert.iconv.*, mcrypt.*, mdecrypt.*
# mcrypt
# mcrypt support => enabled
# mcrypt_filter support => enabled
# mcrypt.algorithms_dir => no value => no value
# mcrypt.modes_dir => no value => no value
# final step
sudo service apache2 restart
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fedorovvldmr commented Dec 21, 2019

@dave-lw, i installed it form source code (gist)

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dave-lw commented Dec 21, 2019

yeah the problem is with your php though, you have several versions installed and it is causing problems. I gave you the solution.

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HenkPoley commented Jan 22, 2020

For Xampp you can look for the DLL links here:

E.g. for my Xampp with PHP 7.3.12, I downloaded 7.3 Thread Safe (TS) x64 from here:

I dropped the DLL in C:\xampp_7.3.12\php\ext\, and added the line extension=php_mcrypt.dll to php.ini

Reminder: you are not supposed to use mcrypt in production.

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abenitesvil commented Apr 21, 2020

You saved my day

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afoysal commented Jul 15, 2020

For PHP 7.3 this is
sudo pecl install mcrypt-1.0.2

How to confirm mcrypt is insalled ?

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HenkPoley commented Jul 15, 2020

php -m lists your active modules.

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konstantinosbotonakis commented Sep 28, 2020

For Windows Users

  • Check in your PHP Info if your PHP is 32bit (x86) or 64bit (x64)
  • Now visit: and download the appropriate version for your PHP's version and the architecture.
  • Again in your PHP info page, search for var: extension_dir and open the directory.
  • Unzip the file you downloaded from the above url.
  • Open your XAMPP's or MAMP's php.ini file. In case you don't know where is it, you can find it from your php info page again:
  • Inside the php.ini file, find where the extensions are loaded. It should be lines like: extension=php_curl.dll etc.
  • Add a new line: extension=php_mcrypt.dll and save the file changes.
  • Now restart XAMPP/MAMPP or apache in general.

It's ready!

You should be able to see something like the following:

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