How big is too big?

Is there a practical limit one should make on a php file to be included? I'm putting all my global variable declarations and function defintitions into one file to be included across the site. I had thought about splitting them different files based on functionality, but then I thought it would be easier to maintain one singular file broken down into sections. But I don't want to overtax anything... so what would be a good size limit on included files? On the same note, is there a practical limit to how much code should be used within an eval() call? Joseph E. Sheble a.k.a. Wizaerd Wizaerd's Realm Canvas, 3D, Graphics, ColdFusion, PHP, and mySQL http://www.wizaerd.com =================================