imagecreatefromjpeg and similar functions are not working in PHP

UserIsCorrupt picture UserIsCorrupt · Nov 12, 2012 · Viewed 154.2k times · Source

I’ve searched for this and the solutions provided in past questions are completely incomprehensible to me. Whenever I run functions like imagecreatefromjpeg, I get this:

Fatal error: Call to undefined function imagecreatefromjpeg() ...

I’m working on a new install of PHP; my last installation never had this problem. I don’t get what’s going on.