How to check if mcrypt extension exists in php

Question

I would like to know the simplest and fastest PHP code line to check if mcrypt extension is available/installed.

There is a function that encrypts a string and first it requires to check if mcrypt is usable. If not, it will execute an alternative encrypt solution available on the system.

Thanks!

Have you searched to see if there is a generic PHP function that checks whether a function exists? — i alarmed alien
– i alarmed alien, Commented Aug 24, 2014 at 22:28
Yes, you are right with that, but also I was looking for the fastest check code. — Heroselohim
– Heroselohim, Commented Aug 24, 2014 at 22:46
you can use some of the techniques from stackoverflow.com/questions/3131411/… — Elzo Valugi
– Elzo Valugi, Commented Aug 8, 2016 at 7:18

Charlotte Dunois · Accepted Answer · 2016-07-30 09:26:12Z

You can use function_exists to check if one of the mcrypt functions exists.

if(function_exists('mcrypt_encrypt')) { echo "mcrypt is loaded!"; } else { echo "mcrypt isn't loaded!"; }

Edit 30.07.2016:
Since my answer still gets a few upvotes from time to time, I benchmarked the performance of mine and Cristi Draghici's answers. The conclusion is, that function_exists is a bit faster than extension_loaded. https://3v4l.org/So4Ep

Cristi Draghici · Accepted Answer · 2015-04-29 07:26:13Z

You can also use extension_loaded():

if (extension_loaded('mcrypt')) { echo "mcrypt is loaded!"; } else { echo "mcrypt isn't loaded!"; }

Mike Mcgrath · Accepted Answer · 2017-06-09 01:10:01Z

If you are using a development environment like XXAMP, or WAMP, there should be a default "phpinfo" page. For example, in XXAMP it would be:

http://localhost/dashboard/phpinfo.php

You can also achieve this same screen by viewing a php file that has: phpinfo(); somewhere in the code.

In this screen, simply search for the string "mcrypt support". If installed, you will see a box that says "enabled".

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