Fatal error: function call undefined mcrypt_encrypt ()

Question

NOTE. Support for MCCR libraries depends on the fact that they have not been updated for years, and MCrypt should no longer be considered a viable or secure way to encrypt data. What's more, MCrypt is deprecated in PHP 5 and completely removed in PHP 7. If you have any code that runs MCrypt, you must reorganize it to use a more modern encryption library.

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Does anyone know why this error message is: (Call to undefined function mcrypt_encrypt() ) displayed when I run the following code below?

I skipped some steps, maybe any settings in PHP that I have to complete before this code can work?

 $key = 'password to (en/de)crypt'; $string = 'string to be encrypted'; $test = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5($key), $string, MCRYPT_MODE_CBC, md5(md5($key))); 

Answer 1

What worked for me with PHP version 5.2.8 was to open php.ini and enable the php_mcrypt.dll extension by deleting ; , i.e. by changing:

;extension=php_mcrypt.dll to extension=php_mcrypt.dll

Answer 2

If you recently upgraded to ubuntu 14.04, this is the fix for this problem:

 $ sudo mv /etc/php5/conf.d/mcrypt.ini /etc/php5/mods-available/ $ sudo php5enmod mcrypt $ sudo service apache2 restart 

Answer 3

For windows

 ;extension=php_mcrypt.dll to extension=php_mcrypt.dll then restart your apache server 

For redhat

 sudo yum install php55-mcrypt //if php5.5 sudo yum install php-mcrypt //if less than 5.4 sudo service httpd restart //if apache 2.4 sudo /etc/init.d/httpd restart //if apache 2.2 or less 

For ubuntu

 sudo apt-get install php5-mcrypt sudo service apache2 restart //if server not reloaded automatically 

If it doesn’t work yet

sudo php5enmod mcrypt && & sudo service apache2 restart

Answer 4

You do not have the mcrypt library installed.

See http://www.php.net/manual/en/mcrypt.setup.php for details.

If you use shared hosting, you can ask your provider to install it.

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On OSX, you can easily install mcrypt via homebrew

 brew install php54-mcrypt --without-homebrew-php 

Then add this line to /etc/php.ini.

 extension="/usr/local/Cellar/php54-mcrypt/5.4.24/mcrypt.so" 

Answer 5

In Ubuntu, I had a problem and solved it with

 $ sudo apt-get install php5-mcrypt $ sudo service apache2 reload 

Answer 6

On ubuntu 14.10:

Install mcrypt module

 sudo apt install php5-mcrypt 

Enable mcrypt module on apache2

 sudo a2enmod mcrypt 

Update module configuration

 sudo service apache2 restart 

Answer 7

On Linux Mint 17.1 Rebecca - calling the undefined function mcrypt_create_iv ...

Solved by adding the following line in php.ini

 extension=mcrypt.so 

After that a

 service apache2 restart 

decided this ...

Answer 8

Is mcrypt enabled? You can use phpinfo() to find out if this is.

Answer 9

One more thing: if you are using PHP through a web server such as Apache, try restarting the web server. This will "reset" any PHP modules that may be present, activating the new configuration.

Answer 10

Assuming you are using debian linux (I am using Linux mint 12, the problem was on the Ubuntu 12.04.1 LTS server on which I was ssh'ed.)

I suggest taking @dkamins advice and make sure you have mcrypt installed and active when installing php5. Use "sudo apt-get install php5-mcrypt" to install. My notes are below.

Using the PHP version of PHP Version 5.3.10-1ubuntu3.4 , if you open phpinfo (), as suggested by @John Conde, what do you do by creating a test file on a web server (for example, create a testphp.php status page only with the content "" anywhere available on the server through the browser)

I did not find that the status is enabled or disabled on the status page when opening in the browser. When I then opened the php.ini file mentioned by @Anthony Forloney, thinking to uncomment ;extension=php_mcrypt.dll to extension=php_mcrypt.dll

I switched it back and forth and restarted Apache (I am running Apache2 and you can restart in my setup using sudo /etc/init.d/apache2 restart or when you are only sudo restart in this directory, I suppose) with the change and unchanged, but all do not go. I took @dkamins advice and went to install the package with "sudo apt-get install php5-mcrypt" and then restarted apache as above. Then my error went away and my application worked perfectly.

Answer 11

If you are using php5-fpm, remember to restart it after installing mcrypt

restarting php5-fpm service

Answer 12

If you are using ubuntu 14.04 here, fix this problem:

First check php5-mcryp already installed apt apt-get install php5-mcrypt

If installed, just run this two commands or install and run this two commands

 $ sudo php5enmod mcrypt $ sudo service apache2 restart 

I hope this works.

Answer 13

I had the same problem for PHP 7 version of missing mcrypt.

It worked for me.

 sudo apt-get update sudo apt-get install mcrypt php7.0-mcrypt sudo apt-get upgrade sudo service apache2 restart (if needed) 

Answer 14

for Linux (Fedora)

 yum -y install php-mcrypt 

Enable the module by adding: 'extension = mcrypt.so' in PHP.ini. (/etc/php.ini)

 systemctl restart httpd.service 

Done!

Answer 15

For me, this helped remove mcrypt with:

 sudo apt-get purge php5-mcrypt 

and just reinstall it:

 sudo apt-get install php5-mcrypt 

and don't forget to restart apache as described above.

I don’t know why and how it was in my case (using vm with provided php55), but maybe this will help someone else. I also had a problem with some other modules like xcache ...

Answer 16

Check and install php5-mcrypt:

 sudo apt-get install php5-mcrypt