Sometimes when we are troubleshooting problems it is useful to know a little bit more information about a users setup. Getting them to run a phpinfo() is one way to do this as it will give you pages and pages of the way the user has php setup on their host. However, running this command is not always easy for some users so having come across this very recently I figured why not stick with what they know and put a little b2evolution plugin together that lists out the extensions that PHP currently knows about.
At this point in time all this plugin does is list out the extensions as this is all I needed at the time. It wouldn't be too hard to add other information if there is a need so leave a comment if there is anything else that you would like to know.
Download the PHP Extensions Plugin, upload it to your plugins folder and install it via the Global Settings tab. Read the readme file and post a comment here with any questions.