PHP 8.3.0 RC 6 available for testing
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User Contributed Notes 12 notes

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13
Greg Rundlett
8 years ago
debian/ubuntu php5 (>= 5.4.0~rc6-1) has introduced two new commands:
php5enmod and php5dismod

# install the extension
sudo apt-get install php5-mcrypt
# you can see that it's installed by the presence of the .ini file
cat /etc/php5/mods-available/mcrypt.ini
# enable it
sudo php5enmod mcrypt
# reload Apache to make use of the extension
sudo service apache2 reload
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10
info at papoo dot de
9 years ago
Same Problem on Linux Mint - Call to undefined function mcrypt_create_iv...

Solved by adding the folowing line to the php.ini
extension=mcrypt.so

After that a
service apache2 restart
solved it...

Have fun with it...
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karan at world dot com
5 years ago
For PHP-7 UNIX Server use this

sudo apt-get install mcrypt php7.0-mcrypt

sudo service apache2 restart
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kmasaryk
14 years ago
Also on Ubuntu, make sure you actually have php5-mcrypt installed. You can install it with:

sudo apt-get install php5-mcrypt

If you get any errors, you may need to enable the 'universe' repository, explained here:
https://help.ubuntu.com/community/Repositories/Ubuntu
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dork
13 years ago
On ubuntu 8 (hardy), the mcrypt library seems to be here.

/usr/lib/php5/20060613/mcrypt.so

So I just created mcrypt.ini in /etc/php5/conf.d and added this one liner.

extension=mcrypt.so
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nsantana at NOSPAMS dot gmail dot com
11 years ago
Using PHP version "PHP Version 5.3.10-1ubuntu3.4" and Ubuntu 12.0.4 on Apache2...

Make sure you have mcrypt installed and active on your php5 install. Use "sudo apt-get install php5-mcrypt" to install, that should sort the issue.
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Jbud
9 years ago
The following link solved my problem

[Tue Dec 24 12:42:33.003683 2013] [:error] [pid 8448] [client 127.0.0.1:33146] PHP Fatal error: Call to undefined function mcrypt_decrypt() ...

http://stackoverflow.com/questions/4809611/problem-with-mcrypt-installation/20208943#20208943
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bobeck at lycos dot com
13 years ago
To make sure that mcrypt doesn't fail to load when
using Windows XP , Apache 2 and php 5, even if all the required procedure to install it has been accomplished already, copy libmcrypt.dll, which is normally in the php main directory, into the php\ext directory.
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cguzmana at gmail dot com
9 years ago
Resolved my problem on Ubuntu 14.04:

$sudo apt-get install php5-mcrypt
$sudo php5enmod mcrypt
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nishanth at sintheetaa dot in
5 years ago
Issue Solved when installing php7.2-mcrypt
I was also facing the same issue. Check this link https://stackoverflow.com/q/48275494/7713811
to get the right solution for installing it in PHP
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rskret at gmail dot com
14 years ago
PROBLEM: cannot load mcrypt extension. please check your php configuration

I have done as suggested by the contributor before me and copied libmcrypt.dll from F:\wamp\bin\php\PHP52~1.8
to C:\WINDOWS\system32 . This did not work on it's own. I found other advice as follows and now mcrypt is working.

OTHER ADVICE:

Go to F:\wamp\bin\php\PHP52~1.8\php.ini
change ;extension=php_mcrypt.dll
to extension=php_mcrypt.dll
(ie. remove ; )

now go to the following 2 files and do the same:
F:\wamp\bin\php\PHP52~1.8\phpForApache.ini
F:\wamp\bin\apache\APACHE~1.11\bin\php.ini

Please adjust the directory location per your own installation.
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ch0wnag3 AT gmail DOT com
15 years ago
On Windows installations, for the dynamic extension (extension=php_mcrypt.dll) to load properly, you must copy libmcrypt.dll from your PHP root folder (e.g. C:\PHP) to the following location:

C:\WINDOWS\system32

With this done, the dynamic extension will load up just fine.
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