Error checking on fopen, file

Hi. I've written a site that works with files a lot. I want to provide some sort of error catching so I'm thinking of putting each fopen and file in an if statement like this: if (fopen("file","r")) { // do code with file } Should I do this for *all* calls to fopen and file? Or just some, like ones that write or append. What's the best programming practice. -- Paul Smith psmith@dostuff.net http://www.dostuff.net