Date Subtraction

hi, Is there any way I can get previous day's date, like we get current date by using getdate() or date() function. I mean is there some in-built function in PHP which can subtract date to give me yesterday's date. I am currently calculating it using some code, which I have written and it is very tirng and recursive to check for each possible case. If someone has solved this before pls let me know. Thanks, Regards, Manoj 'I have miles to go before I sleep, and promises to keep'