Fatal Error: Call to Undefined Function Mcrypt_Encrypt()

Fatal error: Call to undefined function mcrypt_encrypt()

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

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

can't find mcrypt = Call to undefined function Laravel\mcrypt_create_iv()

You need to enable it in your php.ini file as well and probably restart Apache.

In php.ini you will find ;mcrypt.so and remove the ; from it.

Or, if it's not in there, just add mcrypt.so somewhere.

Also the salt option has been deprecated as of PHP 7.0.0. It is now preferred to simply use the salt that is generated by default.

Call to undefined function mcrypt_decrypt() - even when php5-mcrypt installed

Installing is one thing. Enabling is another. Please make sure your /etc/php.ini file contains the following line :

extension=mcrypt.so

If you can't find your php.ini, create a test.php file containing :

<?php phpinfo(); ?>

Execute it with php test.php | grep ".ini", and you'll find the paths to your ini files. One of them must include the extension= line above.

Call to undefined function mcrypt_module_open

It's probably due to your magento version not being compatible with your php version.

php - Fatal error: Call to undefined function mcrypt_get_iv_size() in AppServ

in case of php-7:

sudo apt-get install mcrypt php7.1-mcrypt

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