Way to detect curl present?

I have two hosting providers and one installs curl by default and the other does not but I want a single codebase to be able to run in both servers without maintaining two versions.

Is there a way to detect at runtime whether curl is present so that I can make the proper call one way or the other?

Based on whether it is there I'm using:

curl_get_file_contents
vs.
file_get_contents

 

Try PHP snoopy to parse url. It use fopen, curl, file_get_contents and fsockopen.