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From: John-Paul Stewart <jpstewart@sympatico.ca>
Newsgroups: comp.lang.php
Subject: Re: getting started with encryption
Date: Fri, 10 Oct 2014 18:53:18 -0400
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On 10/10/14 02:46 PM, bill wrote:
>
> My preliminary understanding is that I should use mcrypt. phpMyAdmin
> says "The mcrypt extension is missing. Please check your PHP
> configuration."
>
> apt-get upgrade php5-mcrypt says it is installed and up to date.
> phpinfo() has no mention of mcrypt.

Since you're using apt-get, I assume you're using Debian or a 
derivative.  So you've installed the necessary files but not configured 
PHP to use it.  Run (as root):

php5enmod mcrypt

Then restart Apache.  That should enable the PHP extension.

If you're not running a Debian derivative, then you'll probably have to 
edit php.ini as another poster has suggested.