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

On Ubuntu, with PHP 5 and Apache, you have to run:

apt-get install php5-mcrypt
php5enmod mcrypt
service apache2 restart

If you are using PHP 7:

apt install php7.0-mcrypt

in case of php-7:

sudo apt-get install mcrypt php7.1-mcrypt

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