Today StumbleUpon lead me to this list of optimisation tips for PHP development. Some of them are somewhat more convincing than others but it was number 10 that Hob and I wondered about. It seems a number of sites (e.g. michelf.com, foliovision.com) are happy to tell me that error suppression with @ slows a script down but I can't find anywhere that tells me where the time goes - answers anyone?
Incidently, number five can't really be described as being unique to PHP. Preincrementation is faster in a number of languages.